Contents
1994
Volume: 14 Issue 3
22 Article(s)
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Diffraction and Gratings
The Phase Balance Design Method for Binary Lens and Accumulating Diffractive Analysis
[in Chinese], and [in Chinese]
An optimized Binary Optical Microlens(BOML) is designed using phase balance design method, this is an improvement on the design of Dammann′s step zone plate. The accumulating integral method is used to analyse the BOML′s diffractive result, and compared with Dammann′s zone plate. The calculated results demonstrate thatAn optimized Binary Optical Microlens(BOML) is designed using phase balance design method, this is an improvement on the design of Dammann′s step zone plate. The accumulating integral method is used to analyse the BOML′s diffractive result, and compared with Dammann′s zone plate. The calculated results demonstrate that the efficiency and image quality of this BOML are better than Dammann′s. The advantage of this method is that it can design the BOML with large D/F and arbitrary object and image distance..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 296 (1994)
The Numerical Calculation of the Vector Modal Theory for Any Shape Profile Metallic Grating
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
According to the vector modal theory for any shape profile metallic grating,the diffraction fields are studied numerically. For the sinusoidal profiles and the semielliptic profile grating, the distribution of diffraction efficiency and polarization with arbitrary incident direction and Polarization are given. The effeAccording to the vector modal theory for any shape profile metallic grating,the diffraction fields are studied numerically. For the sinusoidal profiles and the semielliptic profile grating, the distribution of diffraction efficiency and polarization with arbitrary incident direction and Polarization are given. The effect of grating structureparameters(period, width and depth) on the diffration field is also investigated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 303 (1994)
Design of Multiple Focus ZOne Lens
[in Chinese], [in Chinese], and [in Chinese]
This paper proposes a design procedure for a new type of zone lens which may have more than-one main fool, and the locations and efficiences of these fool can be determined flexibly by designer' s requests. This design method is based on the simulated annealing optimization and provides a mean for obtaining some paThis paper proposes a design procedure for a new type of zone lens which may have more than-one main fool, and the locations and efficiences of these fool can be determined flexibly by designer' s requests. This design method is based on the simulated annealing optimization and provides a mean for obtaining some particular optical field distribution and may be very useful for fabrication of special zone lens..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 308 (1994)
Fiber Optics and Optical Communications
Semi-Classical Model and Analysis of Soliton Amplification in Er3+-Doped Fibers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The semi-classical model of soliton amplification in Er3+- doped fibers is established. The condition for transparent transmission in the case of distributed amplification is given. The influence caused by excited-state absorption is discussed in detail. The results obtained in this paper provides the important theoretThe semi-classical model of soliton amplification in Er3+- doped fibers is established. The condition for transparent transmission in the case of distributed amplification is given. The influence caused by excited-state absorption is discussed in detail. The results obtained in this paper provides the important theoretical bases for design of Er3+-doped fiber soliton amplifiers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 257 (1994)
Frequency Responses of Electro-Optic Guided-Wave Modulators with Polarity Reversed Structures
[in Chinese], [in Chinese], and [in Chinese]
In this poper, response characteristics of electro-optic modulators with polarity reversed electrode structures are analyzed and the analytic expressions of the output amplitude and phase of the modulators are derived. Numerical calculation for the bandpass frequency resPOnse of amplitude and nonlinear response of phasIn this poper, response characteristics of electro-optic modulators with polarity reversed electrode structures are analyzed and the analytic expressions of the output amplitude and phase of the modulators are derived. Numerical calculation for the bandpass frequency resPOnse of amplitude and nonlinear response of phase angle are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 264 (1994)
Analysis of Metal-Clad Single-Mode Optical Fiber Polarizer
[in Chinese]
The Perturbation method is used to analyse the metal-clad single-mode optical fiber Polarizer for calculating the attenuation coefficient of Polarized fundamental modes,the extinction ratio (ER) and insertion loss (IL) of polarizers. The method is simple and can be applied to the case of fibre core partially etched offThe Perturbation method is used to analyse the metal-clad single-mode optical fiber Polarizer for calculating the attenuation coefficient of Polarized fundamental modes,the extinction ratio (ER) and insertion loss (IL) of polarizers. The method is simple and can be applied to the case of fibre core partially etched off, which has not be reported before. The results of the present method agree with those of experiment..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 269 (1994)
Study of a Planar Coupling System Consisting of Four Single-Mode Optical Fibers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
On the base of linearly coupled mode equations, we have derived propagation constants, eigenmodes, and characteristics of power coupling for a planar coupling system consisting of four fibers with weak fusion, and fabricated the planar couplar consisting four identical fibers for the first times. The obtained experimenOn the base of linearly coupled mode equations, we have derived propagation constants, eigenmodes, and characteristics of power coupling for a planar coupling system consisting of four fibers with weak fusion, and fabricated the planar couplar consisting four identical fibers for the first times. The obtained experimental results about spectral responses of the coupler are in good agreement with theoritical results..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 275 (1994)
Lasers and Laser Optics
A Raman Free Electron Laser Oscillator
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A flee electron laser oscillator with distributed feedback cavity (DFC) is developed. The theories and experiments of the Raman free electron laser (400 KeV/800 A) with DFC are Studied. The spectral measurements using a microwave grating spectrometer are presented. The narrowed spectral bandwidth covered range of 8.6～8A flee electron laser oscillator with distributed feedback cavity (DFC) is developed. The theories and experiments of the Raman free electron laser (400 KeV/800 A) with DFC are Studied. The spectral measurements using a microwave grating spectrometer are presented. The narrowed spectral bandwidth covered range of 8.6～8.9 mm with central wavelength at 8 mm and output power enhancement show that oscillation happened..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 225 (1994)
Harmonic Free Electron Laser Operating in Compton Region:Gain and Its Saturation
[in Chinese], [in Chinese], and [in Chinese]
The method of perturbation used for calculating the electron distribution function is discribed. The small signal gain and saturation gain of harmonic free electron laser operating in Compton region with planar undulator are obtained. Analyses and discussions on the model and results are given in this paper.The method of perturbation used for calculating the electron distribution function is discribed. The small signal gain and saturation gain of harmonic free electron laser operating in Compton region with planar undulator are obtained. Analyses and discussions on the model and results are given in this paper..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 230 (1994)
The First-Passage-Time Distribution of the Dye-Laser Colored Cubic Model Met Dongcheng
[in Chinese], [in Chinese], and [in Chinese]
The unified-colored-noise approximation proposed by Jung and Hanggi is extended to the multi-dimensional case in this paper. Then, the Langevin equation and FokkerPlanck equation of colored cubic model for single mode dye-laser model are derived with this approximation method. The approximate formulas of the mean, variThe unified-colored-noise approximation proposed by Jung and Hanggi is extended to the multi-dimensional case in this paper. Then, the Langevin equation and FokkerPlanck equation of colored cubic model for single mode dye-laser model are derived with this approximation method. The approximate formulas of the mean, variance, andskewness of the first-P8ssage-time distribution for the model are obtained and compared with the numerical simulations..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 237 (1994)
Nonlinear Optics
Second-Harmonic Generation in the Organic Annular Fibers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper the conversion efficiency of second-harmonic generation (SHG)in the organic annular fiber is analysed based on classical electromagnetic theory. The phase matching, which can be got by the dispersion of guided modes in the annular fibers, is described in some detail. The hemicyanine annular fiber is fabriIn this paper the conversion efficiency of second-harmonic generation (SHG)in the organic annular fiber is analysed based on classical electromagnetic theory. The phase matching, which can be got by the dispersion of guided modes in the annular fibers, is described in some detail. The hemicyanine annular fiber is fabricated by using LB film technique. SHG is measured by the photodetecting instrument with high sensitivity when intense 1. 06 pm pump pulses from a Q-switched YAG laser propagates through the fiber..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 243 (1994)
Optical Devices
A Research of Temporal Behaviour for a New High-Efficiency Photoconductive Switch Pulse Generator
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new high-efficiency microstrip photoconductive switch ultrashort electric pulse generator is presented in this paper. In the ease of high voltage operation, the effect of photoconductive switch and ultrashort optical pulse upon output electric pulse of the generator is studied in theory. And the experimental results A new high-efficiency microstrip photoconductive switch ultrashort electric pulse generator is presented in this paper. In the ease of high voltage operation, the effect of photoconductive switch and ultrashort optical pulse upon output electric pulse of the generator is studied in theory. And the experimental results ale given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 313 (1994)
Investigation on Photorefractive Crystals Using as Phase Filters
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Various photoractive crystals are used as phase filters. Theoretical analysis and experimental results are presented. The influences of different parameters on crystals which are used in phase contrast are discussed in more derail.Various photoractive crystals are used as phase filters. Theoretical analysis and experimental results are presented. The influences of different parameters on crystals which are used in phase contrast are discussed in more derail..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 318 (1994)
Dynamic Visible-to-Infrared Image Converting Device and System
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A Visible-to-infrared dynamic image converting system built for infrared simulation is described in this paper. It adoptS CdS-CdSe photoconductive thin-film type liquid crystal light valve (LCLV) as the key converting device. The video-rate conversion of visible image to infrared (8～12 μm) is realized. The contrast ratA Visible-to-infrared dynamic image converting system built for infrared simulation is described in this paper. It adoptS CdS-CdSe photoconductive thin-film type liquid crystal light valve (LCLV) as the key converting device. The video-rate conversion of visible image to infrared (8～12 μm) is realized. The contrast ratio of 9:1, response time of 40 ms and limiting resolution of 101p/mm have been reached..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 323 (1994)
Study of GaAs Asymmetric X-Junction Waveguide Hrybrid Coupler
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We report on the GaAs asymmetric X-junction waveguide coupler. The mechanism of this coupler is discussed. The device is made on n-/n+ GaAs epitaxial material. The relation among the mode sorting angle and waveguide ridge height and the difference between the propagating constants of two asymmetric waveguides is analyzWe report on the GaAs asymmetric X-junction waveguide coupler. The mechanism of this coupler is discussed. The device is made on n-/n+ GaAs epitaxial material. The relation among the mode sorting angle and waveguide ridge height and the difference between the propagating constants of two asymmetric waveguides is analyzed by using an effective-index approximation. The device is characterized by a power division of -2.9 dB and a crosstalk ratio of less than -20 dB. It is shown that this device could be applied to switcher and optical sensor..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 327 (1994)
Physical Optics
Propagation Properties of Ultrashort Pulses in the Fibers with Slowly Decreasing Dispersion
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We theoretically analysed the relationship between the fiber dispersion and its loss for soliton propagation in the fiber with slowly deceasing dispersion, and designed the structure parameters of the fiber. Numerical results are in agreement with theoretical analysis.We theoretically analysed the relationship between the fiber dispersion and its loss for soliton propagation in the fiber with slowly deceasing dispersion, and designed the structure parameters of the fiber. Numerical results are in agreement with theoretical analysis..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 287 (1994)
Transmission Characteristic of Crassing Waveguide Structure Constructed by Large Single-Mode Rib Semiconductor Waveguide
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper presents a general theoretical investigation of the crossing waveguidestructures constructed by large-size single-mode rib semiconductor waveguides. The theoretical model is based on beam propagation method and effective index method. Three kinds of structure are analysed and compared. The numerical results This paper presents a general theoretical investigation of the crossing waveguidestructures constructed by large-size single-mode rib semiconductor waveguides. The theoretical model is based on beam propagation method and effective index method. Three kinds of structure are analysed and compared. The numerical results show that these structures exhibit similar characteristics at large crossing angles but divergences exist at small crossing angles. It is found that mode-interference dose not exist in y-junction..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 292 (1994)
Quantum Optics
Squeezing of the Radiation Field in A Cavity with Mixed State Atomic System
[in Chinese]
In this report, the information about the initial saute of a two-level system in a cavity is supposed to have nothing by using the principle of maximal entropy. The squeezing behavior of a two-level atom interaction with the cavity field are studied. We have obtained an important result that the strong squeezing of theIn this report, the information about the initial saute of a two-level system in a cavity is supposed to have nothing by using the principle of maximal entropy. The squeezing behavior of a two-level atom interaction with the cavity field are studied. We have obtained an important result that the strong squeezing of the radiation field, when the atom stunS initially in an arbitrary statistical mixed state and initial exciting of the field is intensive enough, is close to those very much that the atom lies in a pure state initially. In the same time, the mixed-state limits of squeezing occurring are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 248 (1994)
Study of Nd-Glass Microsphere Spectra Modified by Cavity QED Effect
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we discuss the influence of cavity quantum electro-dynamic (QED) effect on the fluorescence spectra of Nd- glass microspheres. The relative magnitude of the spikes and the background in spectra is analysed. The cavity QEDenhancement of spontaneous emission rate is estimated to reach 16 times.In this paper, we discuss the influence of cavity quantum electro-dynamic (QED) effect on the fluorescence spectra of Nd- glass microspheres. The relative magnitude of the spikes and the background in spectra is analysed. The cavity QEDenhancement of spontaneous emission rate is estimated to reach 16 times..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 253 (1994)
Rapid Communications
Plasma Ablative Shock Wave and Its Time Evolution
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The shock wave generation by plasma ablation is studied in this paper. The interdependent relations between various hydrodynamic parameters at the shock front and ablative flout are determined, the generation and temporal evolution of ablative shock are discussed in details.The shock wave generation by plasma ablation is studied in this paper. The interdependent relations between various hydrodynamic parameters at the shock front and ablative flout are determined, the generation and temporal evolution of ablative shock are discussed in details..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 331 (1994)
Temperature Dependence of Photorefractive Effects in Fe:KNbO3
[in Chinese], [in Chinese], and [in Chinese]
This paper presents the experimental investigation of temperature dependences (290～380 K) of photorefractive effects in Fe:KNbO3. Results of two-wave coupling under different experimental configuration and self-pumped phase conjugstion in special Cut crystal are demonstrated.This paper presents the experimental investigation of temperature dependences (290～380 K) of photorefractive effects in Fe:KNbO3. Results of two-wave coupling under different experimental configuration and self-pumped phase conjugstion in special Cut crystal are demonstrated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 334 (1994)
Thin Films
Effect of Laser Treatment on Laser Induced Damage of Optical Thin-Film and Laser Glass
[in Chinese], [in Chinese], and [in Chinese]
Optical thin-films and Nd-doped phosphate glass surfaces were processed by excimer laser and CW CO2 laser pre-irradiation. Effect of laser pre-irradiation on laser induced damage threshold is investigated. The related mechanisms are analyzed.Optical thin-films and Nd-doped phosphate glass surfaces were processed by excimer laser and CW CO2 laser pre-irradiation. Effect of laser pre-irradiation on laser induced damage threshold is investigated. The related mechanisms are analyzed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 14, Issue 3, 281 (1994)
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