Contents
1997
Volume: 17 Issue 6
39 Article(s)
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Atmospheric Optics and Oceanic Optics
Numerical Simulation of an Adaptive Optics System: Direct Wavefront Gradient Control Method
[in Chinese], [in Chinese], and [in Chinese]
By using the direct wavefront gradient control method, numerical simulation of all parts of an adaptive optics (AO) system is carried out. We present “phase cutting” of the calculated phase to solve the problem that variance of the calculated residual wavefront is not corresponding to the correction effect of AO systemBy using the direct wavefront gradient control method, numerical simulation of all parts of an adaptive optics (AO) system is carried out. We present “phase cutting” of the calculated phase to solve the problem that variance of the calculated residual wavefront is not corresponding to the correction effect of AO system. The computational results in imaging of lenses by means of the fast Fourier transform (FFT) method agree excellently with those by means of integration method. It is found for the first time that for a constant delay time of an AO system, the compensation effect of the AO system is better than that of complete phase compensation when the velocity of lateral wind exceeds a threshold. It is shown that a better compensation capability of an AO system does not mean a better correction effect..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 758 (1997)
Fiber Optics and Optical Communications
A Vector Modal Theory for Perfectly Conducting Grating with Semi Circular Grooves
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, Hansen vector wave function theory is used to study the diffraction efficiency for a perfectly conducting grating with semi circular grooves. The method suits for the diffraction of optical plane waves with arbitrary incident direction and polarization direction. The results for the special cases of p orIn this paper, Hansen vector wave function theory is used to study the diffraction efficiency for a perfectly conducting grating with semi circular grooves. The method suits for the diffraction of optical plane waves with arbitrary incident direction and polarization direction. The results for the special cases of p or s polarization are well consitent with that given by ref..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 641 (1997)
Fourier Optics and Signal Processing
Optical Implementation of IPA Neural Network Using Electron Trapping Materials
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical IPA(Interpattern association) neural network model is implemented using CaS(Eu, Sm) electron trapping materials synthesized by the authors. The intensity of infrared stimulated luminescence from CaS(Eu, Sm) shows a linear relationship with the product of the trapped electrons' density and the infrared readiOptical IPA(Interpattern association) neural network model is implemented using CaS(Eu, Sm) electron trapping materials synthesized by the authors. The intensity of infrared stimulated luminescence from CaS(Eu, Sm) shows a linear relationship with the product of the trapped electrons' density and the infrared reading power. Therefore, these materials are capable of forming the optical interconnection weight matrix, which may have large dynamic range and can be quickly erased and re-writen by optical method..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 766 (1997)
Instrumentation, Measurement and Metrology
Measurement of Polarization Mode Dispersion in Fiber
[in Chinese], [in Chinese], and [in Chinese]
Polarization mode dispersion in fibers seriously limites high capacity optical fiber communication system. We measured many kinds of fibers and analyzed their results. The measured results of longer non polarization maintaining fiber are fit to Maxwell distribution. And we find the quality of fibers made in China need Polarization mode dispersion in fibers seriously limites high capacity optical fiber communication system. We measured many kinds of fibers and analyzed their results. The measured results of longer non polarization maintaining fiber are fit to Maxwell distribution. And we find the quality of fibers made in China need to be modified. Some phenomena observed in experiments are interpreted and discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 731 (1997)
Interferometric Measurement of Polarization Mode Distribution in Fiber
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A high accuracy method for measuring polarization mode distribution in single mode fiber is designed, which conquers the weakness of classic method measuring the fiber and fibe component. This system, using short coherent length such as SLD, is of the accuracy of couple intensity up to -80 dB and the resolution of survA high accuracy method for measuring polarization mode distribution in single mode fiber is designed, which conquers the weakness of classic method measuring the fiber and fibe component. This system, using short coherent length such as SLD, is of the accuracy of couple intensity up to -80 dB and the resolution of survey distance is 10 mm. A result of measuring Lyot fiber depolarizer is given in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 737 (1997)
Phase Modulation Technique of Digital Speckle Pattern Interferometry
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The phase modulation of digital speckle pattern interferometry (DSPI) is discussed theoretically. The experiments for demonstrating its viability in actural measurements are performed. This method can be used for the measurement of out plane displacement field of tiny and complex deformation.The phase modulation of digital speckle pattern interferometry (DSPI) is discussed theoretically. The experiments for demonstrating its viability in actural measurements are performed. This method can be used for the measurement of out plane displacement field of tiny and complex deformation..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 741 (1997)
A Novel Real-Time Etching Depth Testing System for Micro-Fabrication
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel real time system for etching depth measurement is demostrated. The system is not sensitive to instability, temperature variation and gaseous flow. The measurement error is small than 0.98%. We realized the real time test of etching depth in vavuum environment. This has practical significance to binary optics miA novel real time system for etching depth measurement is demostrated. The system is not sensitive to instability, temperature variation and gaseous flow. The measurement error is small than 0.98%. We realized the real time test of etching depth in vavuum environment. This has practical significance to binary optics micro fabrication..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 745 (1997)
Error Analysis of 3ω Energy Measuring
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Some factors that influence the absolute and relative accuracy of 3ω energy measurement are analyzed from the laser theory. And through a brief simulation experiment, the effect of incident angle on sampling divided ratio is verified. Some special technical means to avoid stray lights affecting 3ω energy measurement.Some factors that influence the absolute and relative accuracy of 3ω energy measurement are analyzed from the laser theory. And through a brief simulation experiment, the effect of incident angle on sampling divided ratio is verified. Some special technical means to avoid stray lights affecting 3ω energy measurement..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 750 (1997)
Lasers and Laser Optics
Analysis of Soft X-Ray Laser Output Behavior by Using Ray Matrix
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Using ray matrix method, we analyse the output behavior of double-pass amplified soft X-ray laser by coupling multi-target or curved target with reflective mirror. A general formula for output divergence is derived, and the influence on output field profile resulting from electron density gradients and mirror misalignmUsing ray matrix method, we analyse the output behavior of double-pass amplified soft X-ray laser by coupling multi-target or curved target with reflective mirror. A general formula for output divergence is derived, and the influence on output field profile resulting from electron density gradients and mirror misalignment is discussed. The theoretical calculation and the available experimentally divergence values are found being in agreement. A new scheme for generating near-diffraction-limited divergence is supposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 649 (1997)
Unidirectional Operation of LDA Side Pumped Nd:YLF Ring Laser Via Acousto Optic Effect
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A traveling wave acousto optic modulator has been used to induce unidirectional operation in a laser diode array (LDA) side pumped Nd:YLF ring laser. The laser can provide single frequency output owing to the elimination of the hole burning effect. Via the prelase Q switching, pulses with peak power of 24 kW (1.2 mJ, 5A traveling wave acousto optic modulator has been used to induce unidirectional operation in a laser diode array (LDA) side pumped Nd:YLF ring laser. The laser can provide single frequency output owing to the elimination of the hole burning effect. Via the prelase Q switching, pulses with peak power of 24 kW (1.2 mJ, 50 ns) at 1.053 μm are obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 656 (1997)
Two-Wavelength Operation of Pulsed Titanium Sapphire Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Pulsed titanium sapphire tunable laser operated at two wavelength is investigated in this paper. The total energy of the two wavelength laser is 41.8 mJ and the tunable range is over 100 nm. Competition effect, influence of gain and loss, temperal characteristics are discussed.Pulsed titanium sapphire tunable laser operated at two wavelength is investigated in this paper. The total energy of the two wavelength laser is 41.8 mJ and the tunable range is over 100 nm. Competition effect, influence of gain and loss, temperal characteristics are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 661 (1997)
Pulsewidth Calculation of Active Passive Mode Locking Fiber Ring Soliton Laser and Its Stability Analysis
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The mechanism of active passive mode locking soliton laser is analysed. Using the spilt step algorithm for numerical integrating NLSE(1-2) a 985 fs soliton train at 10 GHz is obtained. By solving the evolution equations the stability condition and analytic expressions for soliton width of the active passive mode lockinThe mechanism of active passive mode locking soliton laser is analysed. Using the spilt step algorithm for numerical integrating NLSE(1-2) a 985 fs soliton train at 10 GHz is obtained. By solving the evolution equations the stability condition and analytic expressions for soliton width of the active passive mode locking fiber ring solution laser are deduced..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 667 (1997)
Ray-Tracing Analysis of Pumping Reflectors for the Multisegment Nd:Glass Amplifier
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Using the ray tracing and Monte Carlo as well as the experimental fitting data, we present a numerical simulation model for pumping cavities of the multisegment Nd:glass amplifier. The simulation shows that the transfer efficiency, stored energy density distribution and uniformity of the pump radiation are dependent onUsing the ray tracing and Monte Carlo as well as the experimental fitting data, we present a numerical simulation model for pumping cavities of the multisegment Nd:glass amplifier. The simulation shows that the transfer efficiency, stored energy density distribution and uniformity of the pump radiation are dependent on the pumping cavity geometry. A novel pumping cavity is proposed, which demonstrates advantages of the high efficiency, good uniformity and tolerable cost. The results obtained are useful for the design of the large scale multisegment Nd:glass amplifier..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 671 (1997)
Addendum to the Study of Free Electron Maser with Modified Axisymmetrical Quasioptical Cavity of Oblique Rotation
[in Chinese], [in Chinese], and [in Chinese]
The authors previous work on free electron maser with modified axisymmetrical quasioptical cavity of oblique rotation (MAQCOR) is supplemented. The present result shows that the electron cyclotron maser with MAQCOR has an additional advantage, that is the deleterious effect of electron beam thermal spread on beam wave The authors previous work on free electron maser with modified axisymmetrical quasioptical cavity of oblique rotation (MAQCOR) is supplemented. The present result shows that the electron cyclotron maser with MAQCOR has an additional advantage, that is the deleterious effect of electron beam thermal spread on beam wave interaction can be minimized by choosing the rotating angle appropriately..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 677 (1997)
Materials
Properties of DMNPAA Organic Photorefractive Material
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In a new organic polymer photorefractive material, the two beam coupling experiment demenstrates that the gain coefficients of two beam coupling exceed the absorption coefficient. The measured maxium diffraction efficiency is high to 86% in a 105 μm thick polymer film. The grating growth response time is in the order oIn a new organic polymer photorefractive material, the two beam coupling experiment demenstrates that the gain coefficients of two beam coupling exceed the absorption coefficient. The measured maxium diffraction efficiency is high to 86% in a 105 μm thick polymer film. The grating growth response time is in the order of 100 ms. The material also exhibits a net gain of two beam coupling over 200 cm -1. A new way to analysis the photorefractive mechanism is suggested..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 813 (1997)
Improvement of PbWO4 Crystal Optical Properties
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Oxygen vacancy defects and Fe 2+ impurity defects were produced in PbWO 4 crystal growth process due to oxygen deficient, which lead to the coloration of the crystal and the optical properties lower. Doped Sb 2O 3 into the crystal, the oxygen vacancy had been dispeled, and Fe 2+ had been oxidized to Fe 3+ which is coloOxygen vacancy defects and Fe 2+ impurity defects were produced in PbWO 4 crystal growth process due to oxygen deficient, which lead to the coloration of the crystal and the optical properties lower. Doped Sb 2O 3 into the crystal, the oxygen vacancy had been dispeled, and Fe 2+ had been oxidized to Fe 3+ which is colourless. The optical properties and the scintillation characteristics has been enhanced..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 817 (1997)
Nonlinear Optics
Approach to High Quality and High Effieiency Parametric Light
[in Chinese], and [in Chinese]
The unfavorable influeuces of nonuniformity and very little limits of pumping light intensity distribution in time and space are analysed for optical parametric generator of Gaussian wave. A scheme for solving the unfavorable influences and obtaining parametric light with high quality and high efficiency is proposed.The unfavorable influeuces of nonuniformity and very little limits of pumping light intensity distribution in time and space are analysed for optical parametric generator of Gaussian wave. A scheme for solving the unfavorable influences and obtaining parametric light with high quality and high efficiency is proposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 681 (1997)
Photopolymerization of C60 Films in Ultrahigh Vacuum Observed by Second Harmonic Generation
[in Chinese], [in Chinese], and [in Chinese]
Using 1.064 μm wavelength laser pulses, the photopolymerization of C 60 films on a polycrystalline Ag surface under ultrahigh vacuum (UHV) environment is investigated by optical second harmonic generation (SHG) method. It is found that the intensity of the SHG signals from C 60 films increases with the extension of expUsing 1.064 μm wavelength laser pulses, the photopolymerization of C 60 films on a polycrystalline Ag surface under ultrahigh vacuum (UHV) environment is investigated by optical second harmonic generation (SHG) method. It is found that the intensity of the SHG signals from C 60 films increases with the extension of exposure time under ultraviolet light, and finally reaches to a saturation value. We suggested that the enhanced second harmonic generation from photochemically modified C 60 films is induced by the reinforce of bulk electric quadrupole polarization and magnetic dipole..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 687 (1997)
Double Two-Wave Mixing with Low Modulation: I. Internal Space-Charge Fields
[in Chinese], and [in Chinese]
A mixing configuration defined as double two wave mixing is studied theorectically, which consists of two sets of two mutually beams interacting with the same photorefractive volume. Analytical solutions of the 2 order (2K 1 and 2K2) and the main combination components (K1+K2 and K1-K2) of the two primary space charge A mixing configuration defined as double two wave mixing is studied theorectically, which consists of two sets of two mutually beams interacting with the same photorefractive volume. Analytical solutions of the 2 order (2K 1 and 2K2) and the main combination components (K1+K2 and K1-K2) of the two primary space charge field are given. Under certain relations between K1 and K2, the 2 order and the main cross components are so large that can′t be neglected..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 692 (1997)
Double Two-Wave Mixing with Low Modulation: II. Coupling Theory
[in Chinese], and [in Chinese]
We theoretically investigate a mixing configuration defined as double two wave mixing, which consists of two sets of two mutually beams interacting with the same photorefractive volume. Coupled wave analysis shows that in certain relationships between the two primary gratings′ wavevectors, the coupling behavior of the We theoretically investigate a mixing configuration defined as double two wave mixing, which consists of two sets of two mutually beams interacting with the same photorefractive volume. Coupled wave analysis shows that in certain relationships between the two primary gratings′ wavevectors, the coupling behavior of the two pairs beams will be seriously influenced by the 2 order (2K1 and 2K2) and the cross gratings..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 697 (1997)
Nonlinear Fiber Loop:1. Fiber Optical Bistability
[in Chinese], and [in Chinese]
The linear and nonlinear charecteristics of verious optical fiber ring resonators have been processed uniformly using transmission matrix. It is found that in nonlinear operation each of those optical fiber ring resonators can be used to make an all optical fiber bistability device. The configuration, characterictics aThe linear and nonlinear charecteristics of verious optical fiber ring resonators have been processed uniformly using transmission matrix. It is found that in nonlinear operation each of those optical fiber ring resonators can be used to make an all optical fiber bistability device. The configuration, characterictics and threshold of versious Er doped fiber ring bislable devices have been calculated, analysised, and compared. The design principle of the devices has been given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 702 (1997)
Perturbative Analysis of Effect of Applied Electric Field on High-order Response of Photorefractive Effects
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The analytic expressions for the first three higher order harmonics of the space charge field versus time and the applied field are presented by using perturbative expanding to “the hopping model” of Feinberg. The results are valid for arbitrary strengths of characteristics′ fields in the photorefractive materials withThe analytic expressions for the first three higher order harmonics of the space charge field versus time and the applied field are presented by using perturbative expanding to “the hopping model” of Feinberg. The results are valid for arbitrary strengths of characteristics′ fields in the photorefractive materials with arbitrary values of the modulation depths. We aslo study the effect of the applied field on recording of the first three higher order harmonics of the space charge field. It shows that the effect on the space-charge field is very small at case of large diffusion field. The applied field for the maximum saturation values becomes small with the order increasing. With an applied field, higher-order harmonics of the space-charge field show oscillating attenuation versus time until to reach saturation state. The oscillating is strong as the applied field increases with shorter oscillating period. The oscillating amplitude of the space-charge field increases while the contribution of the higher-order harmonics are considered..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 710 (1997)
Optical Devices
GaAs/GaAlAs Traveling-Wave Directional Coupler Modulators: II. Experiment
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The experiments on the GaAs/GaAlAs traveling wave directional coupler optical modulator are done. With aid of a system for measuring the microwave chararcteristics of the traveling wave electrode. Then the paramenter of the modified structure of the device are determined and the traveling wave optical modulator is fabrThe experiments on the GaAs/GaAlAs traveling wave directional coupler optical modulator are done. With aid of a system for measuring the microwave chararcteristics of the traveling wave electrode. Then the paramenter of the modified structure of the device are determined and the traveling wave optical modulator is fabricated and measured. The coplanar traveling wave electrode is used in this device and the measured breakdown voltage is 28 V. Under the measure system with 1.06 μm YAG laser, the switch voltage of 8.5 V is obtained. The velocity mismatching between the microwave, measured by the network analyzer, and the lightwave in the waveguide of the device is less than 3% and the microwave transmission loss is less than 10 dB/cm at 30 GHz which indicates the 3 dB optical modulation bandwidth of the traveling——wave modulator is greater than 32 GHz..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 782 (1997)
Experimental Study of FET-SEED Smart Pixels
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A simple kind of field effect transistor self electrooptic effect device (FET SEED) smart pixels has been fabricated by interconnecting SEEDs and GaAs FETs on a printed circuit board. The smart pixel consists of an input SEED, an output SEED and a GaAs FET amplifier. An optical system has been designed and constructed A simple kind of field effect transistor self electrooptic effect device (FET SEED) smart pixels has been fabricated by interconnecting SEEDs and GaAs FETs on a printed circuit board. The smart pixel consists of an input SEED, an output SEED and a GaAs FET amplifier. An optical system has been designed and constructed to demonstrate and test the smart pixels. The operational principle of the smart pixels is described..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 786 (1997)
Thermo Controlled Thin-Film Optical Modulator Based on Dual Interference Effect
[in Chinese], and [in Chinese]
Thermo controlled thin film optical modulator opreating on reflecting mode is studied based on dual interference effect. The relationship between the modulation depth and the device′s parameters has been analysed theoretically based on dual interference effect and tested experimentally. The modulation depth high as 92%Thermo controlled thin film optical modulator opreating on reflecting mode is studied based on dual interference effect. The relationship between the modulation depth and the device′s parameters has been analysed theoretically based on dual interference effect and tested experimentally. The modulation depth high as 92% is measured..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 790 (1997)
Theoretical Analysis of Interferometric Fiber-Optic Senors′s Input Polarization Control
[in Chinese]
A new theoretical analysis is given for the feedback control principle of the interferometric fiber optic sensor′s input polarization control. The suitable feedback signal is obtained, the requirement of the orginal control voltage and the possible steady point of the control system is analysed, and the feedback controA new theoretical analysis is given for the feedback control principle of the interferometric fiber optic sensor′s input polarization control. The suitable feedback signal is obtained, the requirement of the orginal control voltage and the possible steady point of the control system is analysed, and the feedback control model is set up. The theoretical conclusions consist with the experimental phenomena in the reference..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 794 (1997)
Optical Limitor for Broadband Tunable Laser in Visible Region
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The expermental results of optical limitor for broadband tunable laser in visible region are reported.The expermental results of optical limitor for broadband tunable laser in visible region are reported..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 799 (1997)
Physical Optics
“Chirping Management Method” in Long Distance Optical Fiber Transmission
[in Chinese], [in Chinese], and [in Chinese]
The frequency chirping produced by the nonlinear Kerr effect in the fiber is approximated with the linear frequency chirping. The action of the Kerr effect on red shift and blue shift chirping pulse is analyzed. Based on this, the “chirping management method” is proposed to improve the characteristics of long distance The frequency chirping produced by the nonlinear Kerr effect in the fiber is approximated with the linear frequency chirping. The action of the Kerr effect on red shift and blue shift chirping pulse is analyzed. Based on this, the “chirping management method” is proposed to improve the characteristics of long distance optical fiber transmission..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 772 (1997)
Three Dimension Finite Difference Beam Propagation Method: Application to Ti:LiNbO3 Directional Coupler Modeling
[in Chinese], [in Chinese], and [in Chinese]
The P-R scheme is used to solve three dimension parabolic wave equation, a modeling example for Ti diffused channel-waveguide coupler is presented.The P-R scheme is used to solve three dimension parabolic wave equation, a modeling example for Ti diffused channel-waveguide coupler is presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 778 (1997)
Quantum Optics
The Non-Adiabatic Effect on Dark State
[in Chinese], [in Chinese], and [in Chinese]
The paper analyzes the dynamic behavior of 3 level energy V type atom in a quantum cavity. The interaction of a 3 level dark atom and stationary wave field in the cavity is discussed. The adiabatic condition and effect of non adiabatic factor on dynamic evolution are analysed. The effect on the translation of partial nThe paper analyzes the dynamic behavior of 3 level energy V type atom in a quantum cavity. The interaction of a 3 level dark atom and stationary wave field in the cavity is discussed. The adiabatic condition and effect of non adiabatic factor on dynamic evolution are analysed. The effect on the translation of partial number and the condition of adiabatic evolution are indicated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 754 (1997)
Rapid Communications
Approximate Expressions for Intensity of the Phase-Conjugate Wave in Photorefractive Media
[in Chinese]
Based on an exact solution of nonlinear coupled wave differential equations for photorefractive media, a conservative quantity which plays an important role in the process of deriving the exact solution is discussed. By elementary transformantions, several approximate expressions for intensity of the phase conjugate waBased on an exact solution of nonlinear coupled wave differential equations for photorefractive media, a conservative quantity which plays an important role in the process of deriving the exact solution is discussed. By elementary transformantions, several approximate expressions for intensity of the phase conjugate wave under different special conditions are obtained. As compared with other approximation methods reported, this approximation method is no need of establishing and finding solutions of reduced differential equations, therefore it is characterized by general suitability and simplicity..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 820 (1997)
An Experimental Method for the High Resolution Investigation of External Field Effects of Rydberg Atoms
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An experimental method for the high resolution investigation of external field effects of Rydberg atoms is proposed. From the preliminary results of Rydberg Cs atoms in various external fields obtained by this method, the potential of the method for the external field effect studies of Rydberg atoms has been demonstratAn experimental method for the high resolution investigation of external field effects of Rydberg atoms is proposed. From the preliminary results of Rydberg Cs atoms in various external fields obtained by this method, the potential of the method for the external field effect studies of Rydberg atoms has been demonstrated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 824 (1997)
Design of Optical System for New CCD Microscopic Objective
[in Chinese]
New CCD refracting objective of a short tube length with a long working distance on microscope is suggested and analyzed in detail. Data and results of optical design on this objective are given.New CCD refracting objective of a short tube length with a long working distance on microscope is suggested and analyzed in detail. Data and results of optical design on this objective are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 828 (1997)
Ultraviolet Oscilloscope Paper Used in Array Camera to Record the Far Field of Laser Beam
[in Chinese], [in Chinese], and [in Chinese]
For recording the far field of 1.06 μm wavelength laser beam with an array camera, and using film to record the array spot diameter, it is difficult to read the spots diameter exactly and also affected by the developing condition. However, there are no such problems if the ultraviolet oscilloscope (UO) paper is used inFor recording the far field of 1.06 μm wavelength laser beam with an array camera, and using film to record the array spot diameter, it is difficult to read the spots diameter exactly and also affected by the developing condition. However, there are no such problems if the ultraviolet oscilloscope (UO) paper is used instead of the film. Using the UO paper to record the array spot diameter, the measured beam divergence (at 70% energy) fluctuation is less than 10%, and the energy (at mean divergence) fluctuation is within 5%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 831 (1997)
Spectroscopy
Molecular Cesium Absorption Spectra near 1.06 μm
[in Chinese], and [in Chinese]
The potentials for molecular cesium (Cs2) XΣ1+g and AΣ1+u states have been calculated by RKR method. A set of Franck Condon factors for X state (v"=0～30)→A state (v′=0～30) have been obtained by solving radial Schrodinger equation of nuclei. The absorption spectra is demonstrated in the wavelength near 1.06 μm. TheThe potentials for molecular cesium (Cs2) XΣ1+g and AΣ1+u states have been calculated by RKR method. A set of Franck Condon factors for X state (v"=0～30)→A state (v′=0～30) have been obtained by solving radial Schrodinger equation of nuclei. The absorption spectra is demonstrated in the wavelength near 1.06 μm. The calculated absorption spectra are in good agreement with experimental ones..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 717 (1997)
Time Resolved Photoluminescence Spectroscopy of GaN Excitonic Transitions
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Time resolved photoluminescence spectroscopy has been used to study the dynamics of the free and donor bound exciton transitions in GaN epitaxial layers grown by metal organic chemical vapor deposition (MOCVD). Luminescence spectra, recombination lifetimes of these transitions as well as their temperature dependencies Time resolved photoluminescence spectroscopy has been used to study the dynamics of the free and donor bound exciton transitions in GaN epitaxial layers grown by metal organic chemical vapor deposition (MOCVD). Luminescence spectra, recombination lifetimes of these transitions as well as their temperature dependencies have been measured, from which the radiative recombination lifetimes of about 0.12 ns for the neutral donor bound excitons and of about 0.4 ns for the free excitons have been obtained. The observed high radiative recombination rates of these transitions imply superior optical properties of the GaN, which promise many important optical device applications including efficient and fast UV-bule lasers based on GaN..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 723 (1997)
Spectrum of the Ni-Like Ir Ion
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The characteristics of the high Z ions are very important to the study of X-ray lasing and other field. The energy and spectrum transition of the Ni-like Ir ion are calculated by using the cofiguration 3d 94s, 3d 94d, 3d 94p, 3d 94f.The characteristics of the high Z ions are very important to the study of X-ray lasing and other field. The energy and spectrum transition of the Ni-like Ir ion are calculated by using the cofiguration 3d 94s, 3d 94d, 3d 94p, 3d 94f..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 727 (1997)
Thin Films
Approximate Theory for 1-D Focusing Bragg-Fresnel Multilayer Lens
[in Chinese], and [in Chinese]
This paper introduces an approximate theory and a numerical method used for designing 1 D focusing Bragg Fresnel multilayer lens (LBFML). The results obtained by using a set of computer program worked out by the author are given, and the error of the approximate theory is analysed.This paper introduces an approximate theory and a numerical method used for designing 1 D focusing Bragg Fresnel multilayer lens (LBFML). The results obtained by using a set of computer program worked out by the author are given, and the error of the approximate theory is analysed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 802 (1997)
Choice of Film Materials and Differential Phase Characters of Polarization-Preserving Totally-Reflecting Prisms with a Single Medium Layer
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The incident angle, refractive indices of the glass and the film, and thickness of the film can influence the polarization preserving characters of polarization preserving totally reflecting prisms with a single medium layer. The effects of small variances of these factors are analysed, and a method of choosing film maThe incident angle, refractive indices of the glass and the film, and thickness of the film can influence the polarization preserving characters of polarization preserving totally reflecting prisms with a single medium layer. The effects of small variances of these factors are analysed, and a method of choosing film materials is proposed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 6, 809 (1997)
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