Contents
2000
Volume: 20 Issue 10
27 Article(s)
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Research Article
[in Chinese]
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1440 (2000)
Atmospheric Optics and Oceanic Optics
Analysis of Arrival-of-Angle Fluctuations of Optical Wavefront for Non-Kolmogorov Turbulence
[in Chinese], [in Chinese], and [in Chinese]
For Z-tilt and G-tilt, the variances of the arrival-of-angle fluctuations of optical wavefront, which are functions of the power-law exponent β and the generalized coherence length ρ0, are deduced by introducing the generalized phase spatial power spectrum for non-Kolmogorov turbulence respectively. The results show thFor Z-tilt and G-tilt, the variances of the arrival-of-angle fluctuations of optical wavefront, which are functions of the power-law exponent β and the generalized coherence length ρ0, are deduced by introducing the generalized phase spatial power spectrum for non-Kolmogorov turbulence respectively. The results show that for 2<β<4, the variances of the arrival-of-angle fluctuations of optical wavefront become larger and larger with the increasing of the power-law exponent β and the variance of G-tilt is smaller than that of Z-tilt for the same β..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1323 (2000)
Analysis of the Residual Servo Variance for an Adaptive Optics System
[in Chinese], and [in Chinese]
The relationship between residual servo variance and control bandwidth of an adaptive optics system is discussed. For a system with time delay, a approximate formula for calculating the residual servo variance is derived. The formula to calculate the optimal control bandwidth of a system with measurement noise is givenThe relationship between residual servo variance and control bandwidth of an adaptive optics system is discussed. For a system with time delay, a approximate formula for calculating the residual servo variance is derived. The formula to calculate the optimal control bandwidth of a system with measurement noise is given. For an example, the problem of choosing the optimal control bandwidth of the 61 element adaptive optics system is discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1328 (2000)
Fourier Optics and Signal Processing
Dual-Magnification Technique for Reducing Moire Artifacts of Periodic Targets in Opto-Electric Imaging Systems
[in Chinese], and [in Chinese]
In opto-electric systems, moire artifacts will occur when viewing periodic targets containing spatial frequencies exceeding half of the sampling frequency. The dual-magnification technique which can reduce moire artifacts by using two aliased frames produced in different sampling frequencies is proposed and discussed. In opto-electric systems, moire artifacts will occur when viewing periodic targets containing spatial frequencies exceeding half of the sampling frequency. The dual-magnification technique which can reduce moire artifacts by using two aliased frames produced in different sampling frequencies is proposed and discussed. Three computer simulation examples for qualitatively verifying the effects of the present moire artifacts reduction technique are presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1335 (2000)
Theoretic Study of Smoothing Speckles Using Zero-Correlation Phase Plate
[in Chinese], and [in Chinese]
The characteristics of zero-correlation phase plate smoothing interference speckles are analyzed theoretically and simulated numerically. The results show that although the zero-correlation phase plates are designed on the incident laser beam being a plane wave, the speckle contrasts of the far-field spots with these pThe characteristics of zero-correlation phase plate smoothing interference speckles are analyzed theoretically and simulated numerically. The results show that although the zero-correlation phase plates are designed on the incident laser beam being a plane wave, the speckle contrasts of the far-field spots with these phase plates are much smaller than that with the random phase plates in the case of near-field phase and amplitude having small fluctuations. Therefore the zero-correlation phase plates are more effective than random phase plates for speckles smoothing..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1341 (2000)
A Theory and Method to Obtain Information of Phase Change Rate of Object
[in Chinese]
According to the imaging theory of partially coherent light, the intensity distribution at the output plane of the Foucault knife-edge phase test is obtained．The results indicate that the information about phase change of the input object function can be obtained under given conditions, when it is illuminated by an incAccording to the imaging theory of partially coherent light, the intensity distribution at the output plane of the Foucault knife-edge phase test is obtained．The results indicate that the information about phase change of the input object function can be obtained under given conditions, when it is illuminated by an incoherent quasi-monochromatic source. A method for observing the phase information of objects is given and the imaging cases are analyzed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1347 (2000)
3-D Profilometry Based on Linear Coding Structure Light with Isosceles Triangle Teeth
[in Chinese], and [in Chinese]
A method of 3-D object profilemotry, linearly coded profilometry with linear coding structure light (LCP) having isosceles triangle teeth, is proposed. On the basis of phase measuring profilmotry, it uses linear structure light to code the object to be measured and phase-shifting technique to decode the profile. The foA method of 3-D object profilemotry, linearly coded profilometry with linear coding structure light (LCP) having isosceles triangle teeth, is proposed. On the basis of phase measuring profilmotry, it uses linear structure light to code the object to be measured and phase-shifting technique to decode the profile. The formula of phase decoded is given and the result from mesurement of a head model is shown..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1353 (2000)
On the Linear Shift Invariance of Photon Diffusive Imaging in High Scattering Media
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The linear shift invariance of photon diffusive imaging in high scatter media is analysised based on the perturbation approximation. The image formation mechanism of the photon diffusive imaging system is illustrated for the noninvasive imaging measurements in medical application. The image obtained with this techniqueThe linear shift invariance of photon diffusive imaging in high scatter media is analysised based on the perturbation approximation. The image formation mechanism of the photon diffusive imaging system is illustrated for the noninvasive imaging measurements in medical application. The image obtained with this technique is a response of the inhomogeneities inside the sample to the imaging system. The feature of the photon diffusive imaging system can thus be characterized with a pulse spreading function..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1358 (2000)
New Equations for Analysing the Fractional Talbot Effect
[in Chinese], [in Chinese], and [in Chinese]
A new set of simple equations for analyzing the Fresnel diffraction field distribution of an one-dimensional rectangular grating with the opening ratio 1/M (where M is a positive integer) is derived. In the equations the connection of the structure of a grating with the fractional Talbot distance is considered. They arA new set of simple equations for analyzing the Fresnel diffraction field distribution of an one-dimensional rectangular grating with the opening ratio 1/M (where M is a positive integer) is derived. In the equations the connection of the structure of a grating with the fractional Talbot distance is considered. They are more convenient to describe the fractional Talbot effect than that of the distance-oriented equations and the step-by-step equation. A new way to study the fractional Talbot effect of a grating is presented..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1364 (2000)
Instrumentation, Measurement and Metrology
The Principle of the Scatter Plate Interferometry Based on Statistical Optics
[in Chinese]
The typical optical system of scatter plate interferometry is strictly analysed by means of modern optics. The equivelence of two beams, one of which is scattered first and transmitted secondly and the other is tromsmitted first and then scattered, is proved by Fourier optics. The variation of the two optical pathes caThe typical optical system of scatter plate interferometry is strictly analysed by means of modern optics. The equivelence of two beams, one of which is scattered first and transmitted secondly and the other is tromsmitted first and then scattered, is proved by Fourier optics. The variation of the two optical pathes caused by wave aberration of tested lens is derived. Forthermore, the fringe mechanism, its contrast, the relationship between the correlation of transmittence of two plates and the contrast are discussed by statistical method. The fringe formula of the interferometry is established. The analysis coincides with the experimental results and can explain some phenomena of scatter plate interferometry that could not be explained before..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1378 (2000)
Optical Precision Measurement Technique of Rolling Error
[in Chinese], [in Chinese], and [in Chinese]
A new method to measure rolling of a precision stage using the two-point method is presented. The rolling of stage and the rolling angle profile can be separated from each other by using the angle sensor output data. Experimental results showed that the rolling can be measured to 0.05" determined by the stability A new method to measure rolling of a precision stage using the two-point method is presented. The rolling of stage and the rolling angle profile can be separated from each other by using the angle sensor output data. Experimental results showed that the rolling can be measured to 0.05" determined by the stability of the rolling measurement system..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1403 (2000)
Image Quality of Space Line CCD Camera with Imaging Methods of Fine Signal Sampling
[in Chinese], [in Chinese], and [in Chinese]
Two formula of modulation and modulation transfer function (MTF) of a line CCD optical-electronic imaging system are deduced by both methods of continuous fine signal sampling and interval fine signal sampling. It was pointed out that these two methods were different in improving the imaging quality of space line CCD cTwo formula of modulation and modulation transfer function (MTF) of a line CCD optical-electronic imaging system are deduced by both methods of continuous fine signal sampling and interval fine signal sampling. It was pointed out that these two methods were different in improving the imaging quality of space line CCD camera. The characteristics of the two methods were compared..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1407 (2000)
Lasers and Laser Optics
Heating of Planar Metal Targets by Ultrashort Laser Pulses
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The interaction of ultrashort laser pulses with planar metal targets are investigated theoretically. The energy flux in the process of femtosecond laser pulse heating is analyzed. The electron temperature as a function of time is derived based on the one-dimensional, two-temperature diffusion model. The range of ultrosThe interaction of ultrashort laser pulses with planar metal targets are investigated theoretically. The energy flux in the process of femtosecond laser pulse heating is analyzed. The electron temperature as a function of time is derived based on the one-dimensional, two-temperature diffusion model. The range of ultroshort laser duration and an expression of the highest electron temperature for the ultrashort laser pulses heating have been obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1297 (2000)
Analysis and Calculation of the Optical Forceon a Double-Layer Dielectric Sphere
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical force was calculated for a double-layer dielectric sphere. Results indicate that the optical force was determined by the relative refractive index and thickness of the two layers. Especially, when the refractive index of the inner layer is higher than that of the outer layer, a smaller region, where the trappinOptical force was calculated for a double-layer dielectric sphere. Results indicate that the optical force was determined by the relative refractive index and thickness of the two layers. Especially, when the refractive index of the inner layer is higher than that of the outer layer, a smaller region, where the trapping stiffness is improved effectively, can be achieved with the reducing of the radius of the inner layer, and the double-layer dielectric sphere can be confined stably in this region. In comparison, if the index of refraction of the inner layer is lower than that of the outer layer, two stable equilibrium positions may be found when the inner radius decreases..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1305 (2000)
KTP Optical Parametric Oscillator with Both Critically and Non-Critically Phase-Matching
[in Chinese], [in Chinese], and [in Chinese]
The experimental results of KTP optical parametric osillator(OPO) pumped by Nd:YAG lasers are reported at both wavelengths 1064 nm and 532 nm with critically phase-matching (CPM) and non-critically phase-matching (NCPM). The eye-safe lasers have been demonstrated with tuning range of 1.53 to 1.84 μm, maximum energy of The experimental results of KTP optical parametric osillator(OPO) pumped by Nd:YAG lasers are reported at both wavelengths 1064 nm and 532 nm with critically phase-matching (CPM) and non-critically phase-matching (NCPM). The eye-safe lasers have been demonstrated with tuning range of 1.53 to 1.84 μm, maximum energy of 130 mJ, and energy conversion efficiency as high as 64%. The tuning range, walk-off angle, acceptance angle, threshold and conversion efficiency are compared and analyzed, and the effects of walk-off on the beam quality and conversion efficiency of OPO are discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1368 (2000)
A Laser-Diode Pumped Nd:GdVO4 Laser
[in Chinese], [in Chinese], and [in Chinese]
Characteristics of a high-brightness laser-diode end-pumped CW and passively Q-switched Nd:GdVO4 laser ware studied. Using KTP as the intracavity frequency doubler, 119 mW green output power was obtained at a pump power of 881 mW, corresponding to a optical-to-optical efficiency of 13.5%. Passively Q-switched operationCharacteristics of a high-brightness laser-diode end-pumped CW and passively Q-switched Nd:GdVO4 laser ware studied. Using KTP as the intracavity frequency doubler, 119 mW green output power was obtained at a pump power of 881 mW, corresponding to a optical-to-optical efficiency of 13.5%. Passively Q-switched operation was realized using Cr4+:YAG as the saturable absorber. Stable pulses with pulse duration of 116～24 ns and repetition rate of 500 KHz～1.8 MHz were generated..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1374 (2000)
Two-Wavelength Mie Lidar for Monitoring of Tropospheric Aerosol
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A two-wavelength Mie lidar was developed to measure the aerosol extinction coefficient profiles at 532 nm and 1064 nm wavelength in the troposphere. Specification and overall structure of the lidar are introduced. The structure and operation principle of its main subassemblies are presented. Some typical aerosol profilA two-wavelength Mie lidar was developed to measure the aerosol extinction coefficient profiles at 532 nm and 1064 nm wavelength in the troposphere. Specification and overall structure of the lidar are introduced. The structure and operation principle of its main subassemblies are presented. Some typical aerosol profiles over Hefei are shown and discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1412 (2000)
Materials
Temperature Dependence of Luminescent Intensity of PbWO4 Crystals
[in Chinese], [in Chinese], and [in Chinese]
The temperature dependence of luminescent intensity (I-T) of PbWO4 crystals with X-ray excitation from 110 K to 300 K was studied. The structure of I-T curve is analysed by means of thermoluminescence and explained by the traps effect.The temperature dependence of luminescent intensity (I-T) of PbWO4 crystals with X-ray excitation from 110 K to 300 K was studied. The structure of I-T curve is analysed by means of thermoluminescence and explained by the traps effect..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1418 (2000)
Second Order Nonlinear Optical Properties of Indium Tin Oxide Thin Films
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Nonlinear optical properties of indium tin oxide (ITO) films have been investigated by using second harmonic generation (SHG) technique. Significant SHG signals and nonlinear optical in-plane anisotropy were observed due to orientation of the crystal cells in ITO films. The signals increased quickly with increasing theNonlinear optical properties of indium tin oxide (ITO) films have been investigated by using second harmonic generation (SHG) technique. Significant SHG signals and nonlinear optical in-plane anisotropy were observed due to orientation of the crystal cells in ITO films. The signals increased quickly with increasing the film thickness above certain threshold..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1421 (2000)
Optical Design and Fabrication
Design of Athermal Optical System
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The normalized efficiency T of thermal power dispersion and normalized efficiency C of chromatic power dispersion of optical materials are introduced. Based on the mutual compensation of thermal dispersion and chromatic dispersion, the equations are formulated for athermalization of optical system. The suitable materiaThe normalized efficiency T of thermal power dispersion and normalized efficiency C of chromatic power dispersion of optical materials are introduced. Based on the mutual compensation of thermal dispersion and chromatic dispersion, the equations are formulated for athermalization of optical system. The suitable materials of athermal optical system can be selected using the T-C chart. The defocus, lateral aberration and modulation transfer function(MTF) of two athermalized lenses with the same parameters are designed using the method, are given as examples..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1386 (2000)
Athermal Design for Infrared Diffractive/Refractive Optical System
[in Chinese], [in Chinese], and [in Chinese]
Thermal properties of the diffractive lens are studied, a method for designing athermal diffractive-refractive optical system in infrared region is introduced. An optical system with 100% cold shield efficiency, 4 degrees of field of view is designed, associated with high optical quality in large working temperature raThermal properties of the diffractive lens are studied, a method for designing athermal diffractive-refractive optical system in infrared region is introduced. An optical system with 100% cold shield efficiency, 4 degrees of field of view is designed, associated with high optical quality in large working temperature range -30～70℃..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1392 (2000)
Optical Devices
The Theoretical and Experimental Study of Two-Dimensional Multichannel Acousto-Optic Interaction
[in Chinese], [in Chinese], and [in Chinese]
The interactions of two-dimensional multichannel parallel acoustic waves with an optical light beam are studied. A set of coupled wave equations for two-dimensional multichannel acousto-optic is put forward, and its solutions are derived. The linear and nonlinear effects of the principle diffraction from each channel aThe interactions of two-dimensional multichannel parallel acoustic waves with an optical light beam are studied. A set of coupled wave equations for two-dimensional multichannel acousto-optic is put forward, and its solutions are derived. The linear and nonlinear effects of the principle diffraction from each channel and intermodulation of the two-dimensional multichannel acousto-optic interaction are analyzed theoretically. A new type of two-dimensional multichannel acousto-optic modulators is made, and its characteristics are measured. The theoretical analysis is supported by the experimental results. The matrix-vector multiplication operation has performed by use of the two-dimensional multichannel Bragg acousto-optic modulator..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1396 (2000)
Quantum Optics
Intensity Noise Properties of LD Pumped Single-Frequency Ring Lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Intensity noise spectra of LD pumped Nd:YVO4, Nd:YAG and Nd:YAP single-frequency ring laser are measured experimentally and compared with the spectra calculated with laser quantum model. The results show that there is an intensity noise about tens dB higher than the shot noise level (SNL) at the frequency of several huIntensity noise spectra of LD pumped Nd:YVO4, Nd:YAG and Nd:YAP single-frequency ring laser are measured experimentally and compared with the spectra calculated with laser quantum model. The results show that there is an intensity noise about tens dB higher than the shot noise level (SNL) at the frequency of several hundred kHz deriving from resonant relaxation oscillation (RRO). In the frequency range of far above RRO, the intensity noise reaches to the SNL. The peak of the RRO shifts to higher frequencies and the height of peak reduces as the pump power increases..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1311 (2000)
Eigenstates of the Higher Powers of Annihilation Operator of a Non-Harmonic Oscillator and Their Higher-Order Squeezing
[in Chinese], [in Chinese], and [in Chinese]
The eigenstates of the Nth powers (N≥3) of the annihilation operator of the non-harmonic oscillator are constructed, and their mathematical and higher-order squeezing properties are studied. The results show that they form a complete Hilbert space, and the Mth power ［M=(n+1/2)N; n=0, 1, 2, …］ squeezing effects exist inThe eigenstates of the Nth powers (N≥3) of the annihilation operator of the non-harmonic oscillator are constructed, and their mathematical and higher-order squeezing properties are studied. The results show that they form a complete Hilbert space, and the Mth power ［M=(n+1/2)N; n=0, 1, 2, …］ squeezing effects exist in all eigenstates when N is even..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1317 (2000)
Rapid Communications
A Wavelength-Selective Switch Based on Fiber Bragg Grating and Fiber Loop Mirror
[in Chinese], [in Chinese], and [in Chinese]
A new structure optical wavelength-selective switch based on fiber loop mirror and fiber Bragg grating is studied. The dynamic range of greater than 17 dB and insertion loss of 0.5 dB at wavelength-selective port were obtained. The measured spectra and numerical simulation indicate that the imperfect of the device can A new structure optical wavelength-selective switch based on fiber loop mirror and fiber Bragg grating is studied. The dynamic range of greater than 17 dB and insertion loss of 0.5 dB at wavelength-selective port were obtained. The measured spectra and numerical simulation indicate that the imperfect of the device can be attributed to the definite difference between the two arms, which was about 1.35 mm. Devices with better characteristics can be developed by decreasing the difference..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1425 (2000)
Discussion on Phase Errors Caused by Frequency Leakage in FTP
[in Chinese], [in Chinese], and [in Chinese]
The phase error caused by leakage in a 3-D object measurement Fourier transform profilometry (FTP) method is discussed. Because the deformed fringe pattern captured by CCD camera is a function with limited extension in space, it must be extended to infinite space before discrete Fourier transform is computed. If the exThe phase error caused by leakage in a 3-D object measurement Fourier transform profilometry (FTP) method is discussed. Because the deformed fringe pattern captured by CCD camera is a function with limited extension in space, it must be extended to infinite space before discrete Fourier transform is computed. If the extended period is not integer times of the grating period, the smooth fringes can not be obtained through extending. When Fourier transform of the discontinuous fringe is calculated, phase error will occur, which is called leakage error. In this paper, the relationship between extended period and frequency leakage is analyzed, the calculation model of phase errors caused by leakage is proposed, quantitative analysis of phase error is presented. A fringe extrapolation method is put forward to decrease the leakage errors. Computer simulations and primary experiments have confirmed the analysis..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1429 (2000)
Modulation Instability in Decreasing Dispersion Fibers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Modulation instability in decreasing dispersion fibers (DDF) is investigated by means of theoretical analysis and numerical simulation. The gain spectrum of modulation instability is obtained as a function of axially-varying dispersion parameter. The results show that the gain spectrum of DDF is much broader than that Modulation instability in decreasing dispersion fibers (DDF) is investigated by means of theoretical analysis and numerical simulation. The gain spectrum of modulation instability is obtained as a function of axially-varying dispersion parameter. The results show that the gain spectrum of DDF is much broader than that of ordinary optical fibers. The broad gain bandwidth can be obtained by selecting the dispersion parameter of DDF. The numerical simulation also shows that fundamental soliton pulses with high repetition rate can be generated in this kind of fiber by modulation instability..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 10, 1435 (2000)
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