Contents
1997
Volume: 17 Issue 1
25 Article(s)
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Fiber Optics and Optical Communications
Analytical Solutions of Double Clad Elliptical Optical Waveguide
[in Chinese], and [in Chinese]
The analytical solutions of electromagnetic wave equations for double clad elliptical optical waveguide have been studied. The mode field distribution and the mode characteristic equations are obtained. The numerical solution for charactistic equations of fundamental modes are derived. The normalized birefringence and The analytical solutions of electromagnetic wave equations for double clad elliptical optical waveguide have been studied. The mode field distribution and the mode characteristic equations are obtained. The numerical solution for charactistic equations of fundamental modes are derived. The normalized birefringence and modal dispersion as functions of normalized frequency for different aspect ratios are presented and compared with Guassian approximation..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 106 (1997)
Holography
Optical Transfer Function of Image Quality Criterion for Rough Wavefront and Tolerance Theory of Roughness
[in Chinese]
An otpical transfer function and its image quality criterion developed which consist of wave aberrations and roughness errors. And the tolerance theory of roughness is discussed.An otpical transfer function and its image quality criterion developed which consist of wave aberrations and roughness errors. And the tolerance theory of roughness is discussed..
Acta Optica Sinica
- Publication Date: Aug. 13, 2020
- Vol. 17, Issue 1, 45 (1997)
New Method for Strengthening Sensitivity of the Red Sensitized Dichromated Gelatin
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the analysis on the general red sensitive dichromated gelatin (MBDCG) systems having lower sensitivity than dichromated gelatin, a new method for strengthening its sensitivity is presented herein. The sensitizing machanism and the results of the experimental verification are discussed. The practical sensitizinBased on the analysis on the general red sensitive dichromated gelatin (MBDCG) systems having lower sensitivity than dichromated gelatin, a new method for strengthening its sensitivity is presented herein. The sensitizing machanism and the results of the experimental verification are discussed. The practical sensitizing result by this method is investigated as well..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 53 (1997)
High Resolution High Reliability Laser Beam Coding Target Recognition Technique
[in Chinese], [in Chinese], and [in Chinese]
A cooperative target recognition technique based on laser beam coding is presented in this paper. As a result, the problems such as electromagnetic interference and garbling which exist in airwave target recognition can be solved. The recognition resolution can be improved and bit error rate can be reduced by this way.A cooperative target recognition technique based on laser beam coding is presented in this paper. As a result, the problems such as electromagnetic interference and garbling which exist in airwave target recognition can be solved. The recognition resolution can be improved and bit error rate can be reduced by this way. A laser modulated M-sequence coder is designed for target recognition system, thus recognition security and quality of Question and Answer signals can be increased greatly..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 58 (1997)
Study of Constructing Self Fourier Functions
[in Chinese], and [in Chinese]
This article studies the recipe of constructing Self Fourier Functions(SFFs). A method complementary to the Caola′s is given as f(x)=g(x)g(-x)+g F(x)g F (-x). Its advantage and disadvantage are discussed. The simplest expression of constructing recipe for SFFs is deduced.This article studies the recipe of constructing Self Fourier Functions(SFFs). A method complementary to the Caola′s is given as f(x)=g(x)g(-x)+g F(x)g F (-x). Its advantage and disadvantage are discussed. The simplest expression of constructing recipe for SFFs is deduced..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 64 (1997)
Two Dimensional Nonlinear Thresholding Liquid Crystal Light Valve
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A transmissive two dimensional nonlinear thresholding liquid crystal light valve has been fabricated. Each pixel occupies 20 μm× 20 μm square and consists of a photodetector and control electrode pad. Its electrooptics, photooptics, and thresholding feature is measured.A transmissive two dimensional nonlinear thresholding liquid crystal light valve has been fabricated. Each pixel occupies 20 μm× 20 μm square and consists of a photodetector and control electrode pad. Its electrooptics, photooptics, and thresholding feature is measured..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 69 (1997)
Image Nonlinear Segmentation Based on Multilayer Neural Networks
[in Chinese], [in Chinese], and [in Chinese]
A new image nonlinear segmentation method based on multilayer neural network is proposed in this paper. The technique of improving the learing speed and the method of selecting learing patterns are discussed. The experiment shows that proposed multilayer neural network can be used for real time image segmentation and tA new image nonlinear segmentation method based on multilayer neural network is proposed in this paper. The technique of improving the learing speed and the method of selecting learing patterns are discussed. The experiment shows that proposed multilayer neural network can be used for real time image segmentation and the good results can be obtained..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 74 (1997)
Lasers and Laser Optics
Composite Cavity Injection Locking for Small Sized TEA CO2 Lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new type of laer locking technique for small sized TEA CO 2 laserscomposite cavity injection locking and its principle are presented. The frequency characteristics of a composite cavity injection laser are analyzed theoretically. The preliminary experimental results of the locking technique are given.A new type of laer locking technique for small sized TEA CO 2 laserscomposite cavity injection locking and its principle are presented. The frequency characteristics of a composite cavity injection laser are analyzed theoretically. The preliminary experimental results of the locking technique are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 32 (1997)
Compressing the Coherence Length of a Laser Diode
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The coherence length of a laser diode can be reduced by modulating the source with a high frequency signal superposed on the driving current for the laser diode. Experiments are made with a 980nm laser diode. It is shown that the coherence length has been reduced by 20 times.The coherence length of a laser diode can be reduced by modulating the source with a high frequency signal superposed on the driving current for the laser diode. Experiments are made with a 980nm laser diode. It is shown that the coherence length has been reduced by 20 times..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 37 (1997)
Laser Performance of LD Pumped Nd∶Sr5(VO4)3F Crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Laser quality single crystal of Nd∶SVAP was obtained by Czochralski method in our laboratory. Room temperature polarized absorption and emission spectra of the X(a) axis cut and Y axis cut samples are analysed in this paper, and the laser characteristic of the two differently cut samples are studied.Laser quality single crystal of Nd∶SVAP was obtained by Czochralski method in our laboratory. Room temperature polarized absorption and emission spectra of the X(a) axis cut and Y axis cut samples are analysed in this paper, and the laser characteristic of the two differently cut samples are studied..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 41 (1997)
Utilization of Cellular Automata Phase Unwrapping Method in 3 D Sensing
[in Chinese], and [in Chinese]
The utilization of cellular automata phase unwrapping method in 3 D sensing of complex object shapes has been studied. By constructing binary control mask using intensity modulation analysis method, we can unwrap complex phase maps. The experimental results of a human jaw model are given.The utilization of cellular automata phase unwrapping method in 3 D sensing of complex object shapes has been studied. By constructing binary control mask using intensity modulation analysis method, we can unwrap complex phase maps. The experimental results of a human jaw model are given..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 112 (1997)
Submicron Projection Lithography with Second Harmonic Light of Copper Vapor Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In order to study the feasibility of submicron lithography using second harmonic light of a copper vapor laser(CVL), a 1∶1 catadioptric projection lens, and an illumination system which consists of a rotating diffuser and a ligth pipe, are designed and constructed. A resolution of 0.6 μm line/space patterns is producedIn order to study the feasibility of submicron lithography using second harmonic light of a copper vapor laser(CVL), a 1∶1 catadioptric projection lens, and an illumination system which consists of a rotating diffuser and a ligth pipe, are designed and constructed. A resolution of 0.6 μm line/space patterns is produced in AZ1350 resist. The result shows that the second harmonic light of CVL can be used as an illumination source in submicron lithography..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 117 (1997)
Nonlinear Optics
Theoretical and Experimental Study on Second Harmonic Generation of Anisotropic Crystal Waveguides
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the couple wave theory of waveguide, second harmonic generation (SHG) efficiencies of planar and channel waveguides have been deduced for the specific structures of the two waveguides. The effects of various factors on SHG efficiency of the waveguides were discussed. Mg∶LN and LT waveguides were fabricated by Based on the couple wave theory of waveguide, second harmonic generation (SHG) efficiencies of planar and channel waveguides have been deduced for the specific structures of the two waveguides. The effects of various factors on SHG efficiency of the waveguides were discussed. Mg∶LN and LT waveguides were fabricated by ion exchange and their SHG properties have been measured and discussed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 1 (1997)
Chaos Control of Acousto Optical Bistable System
[in Chinese], [in Chinese], and [in Chinese]
This paper gives a method of chaos control to acousto optical bistable (AOB) system using the technique of continuous parameter delayed feedback. Numerical results show that under some stiffness of control the controlled system has negtive maximum Lyapunov exponent (MLE) in the initial chaotic domain and so that controThis paper gives a method of chaos control to acousto optical bistable (AOB) system using the technique of continuous parameter delayed feedback. Numerical results show that under some stiffness of control the controlled system has negtive maximum Lyapunov exponent (MLE) in the initial chaotic domain and so that controlled state is convinced to be the unstable fixed point or unstable periodic orbit (UPO) of the initial system. By comparied with the experimental results, the validity of this control method is verified..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 10 (1997)
Propagation of Femtosecond Optical Pulse in Organic Polymers∶PPQ
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Organic polymers are attractive nonlinear materials because of their both large nonlinear coefficient and ultrafast response time. By use of the modified nonlinear Schrodinger equation, we have investigated numerically the effect of delayed nonlinear response time, as well as second and third order dispersion, on the pOrganic polymers are attractive nonlinear materials because of their both large nonlinear coefficient and ultrafast response time. By use of the modified nonlinear Schrodinger equation, we have investigated numerically the effect of delayed nonlinear response time, as well as second and third order dispersion, on the propagation of femtosecond optical pulse. It has been shown that the red shift due to delayed nonlinear response time in frequency domain increases with the increasing of delayed nonlinear response time exceeds a certain value..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 16 (1997)
CW Laser Induced Thermal and Mechanical Damage in Optical Window Materials
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
CW laser induced thermal and mechanical damage in optical window materials are investigated. Inhomogenous absorptance will result in thermal stress in optical materials, which seriously induced macrodamage, fusion or fracture. Thermal and mechanical damage are related to laser power and thermal properties of materials.CW laser induced thermal and mechanical damage in optical window materials are investigated. Inhomogenous absorptance will result in thermal stress in optical materials, which seriously induced macrodamage, fusion or fracture. Thermal and mechanical damage are related to laser power and thermal properties of materials. Ion exchange treatment was used to strengthen glass surface..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 20 (1997)
Frequency Upconversion in Germanosilcate Single Mode Optical Fiber
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Generation of visible light at 588 nm with peak power as high as 20 W through efficient frequency upconversion of 1.313 μm Q switched and mode locked Nd∶YLF laser pulse in a standard communication single mode germanosilicate optical fiber is reported. The conversion efficiency is measured to be 0.09% in 21 m fiber Generation of visible light at 588 nm with peak power as high as 20 W through efficient frequency upconversion of 1.313 μm Q switched and mode locked Nd∶YLF laser pulse in a standard communication single mode germanosilicate optical fiber is reported. The conversion efficiency is measured to be 0.09% in 21 m fiber at 24 kW peak pump power. A blue green light with multi peak continues spectrum structure at 46￣560 nm generated by three wave sum frequency is also observed. The frequency upconversion process of blue green light is competing with the process of generation visible light at 588 nm..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 24 (1997)
Harmonic Generation by Tunnelling Ionization
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Ionization dynamics is investigated for intense laser gas interaction, in which tunnelling ionization is assumed to be the dominant process. The electric filed perodic variations of laser by tunnelling ionization is calculated. The harmonics obtained by Fourier series decomposition.Ionization dynamics is investigated for intense laser gas interaction, in which tunnelling ionization is assumed to be the dominant process. The electric filed perodic variations of laser by tunnelling ionization is calculated. The harmonics obtained by Fourier series decomposition..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 28 (1997)
Physical Optics
Turbulence Path Integral Parameters and Light Propagation Effects in Turbulent Atmosphere
[in Chinese]
The relationship between the light propagation effects in the turbulent atmosphere and the path integral parameters of the refractive index structure constant C 2 n is analyzed with the theory of light propagation in the turbulent atmosphere. The path integral parameters of C 2 n corresponding to the coherent lengtThe relationship between the light propagation effects in the turbulent atmosphere and the path integral parameters of the refractive index structure constant C 2 n is analyzed with the theory of light propagation in the turbulent atmosphere. The path integral parameters of C 2 n corresponding to the coherent length, the fluctuation of the arriving angle, the spreading and wandering of light beam are obtained with the equivalent refractive index structure constant derived from the measurement of the light intensity fluctuation, and the relative differences of these parameters with true values are evaluated. For periodic, decreasing, increasing, and random turbulent paths the relative differences are calculated as functions of various path parameters. The relative differences for the periodic turbulent path increase with the amplitude parameter and behave as damped oscillations with the frequency parameter. The relative differences for the decreasing and the increasing turbulent path are quite high. For a random turbulent path, the relative differences fluctuate with time series number and their statistical average values decrease with the number of the independent turbulent intervals. Suggestions for the accurate evaluation of the optical turbulence effects are given according to the results..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 79 (1997)
The Practical EDFA and Its Application in Analog Optical Fiber Systems
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The characteristics of noise and distortion on an erbium doped fiber amplifier (EDFA) are investigated experimentally for using in optical FM frequency division multiplexing (FDM) video systems. The transmission experiment at the signal noise ratio of 56 dB over 180 km and 215 km were performed by using EDFA as a post The characteristics of noise and distortion on an erbium doped fiber amplifier (EDFA) are investigated experimentally for using in optical FM frequency division multiplexing (FDM) video systems. The transmission experiment at the signal noise ratio of 56 dB over 180 km and 215 km were performed by using EDFA as a post amplifier and an in line amplifier..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 86 (1997)
Rapid Communications
A Design of Femtosecond Pulse Stretcher
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A kind of compact and effective femtosecond pulse stretcher are designed reasonablely based on the Kirchhoff Fresnel integral. Not only a high stretching rate has been obtained, but also the spatial characteristics of the light beam through the stretcher has been reconstructed.A kind of compact and effective femtosecond pulse stretcher are designed reasonablely based on the Kirchhoff Fresnel integral. Not only a high stretching rate has been obtained, but also the spatial characteristics of the light beam through the stretcher has been reconstructed..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 122 (1997)
Corrected Calculation of Narcissus Induced Temperature Difference in Scanned Infrared Imaging Systems
[in Chinese]
Based on the principles of radiometry and consideration of receiving size of the detector, the method now being used to calculate narcissus induced temperature difference is corrected. It can be used to evaluate the narcissus effects during optical design process and also to provide narcissus criteria for thermal imagiBased on the principles of radiometry and consideration of receiving size of the detector, the method now being used to calculate narcissus induced temperature difference is corrected. It can be used to evaluate the narcissus effects during optical design process and also to provide narcissus criteria for thermal imaging systems..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 126 (1997)
Thin Films
Study on Photoinduced Optical Anisotropy in Hemicyanine Langmuir Blodgett Multilayers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Photoinduced optical anisotropy in Y type interleaving hemicyanine/arachidic acid Langmuir Blodgett multilayers has been investigated by optical linear and nonlinear measurements. Under illumination of a polarized UV nanosecond laser beam, the hemicyanine molecules would reorient and align their chromophore axes along Photoinduced optical anisotropy in Y type interleaving hemicyanine/arachidic acid Langmuir Blodgett multilayers has been investigated by optical linear and nonlinear measurements. Under illumination of a polarized UV nanosecond laser beam, the hemicyanine molecules would reorient and align their chromophore axes along the direction of the UV beam polarization. Thermal isotropic process was accompanied by dissociation of the H aggregate in the hemicyanine LB multilayers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 91 (1997)
Experimental Study of Excitation Efficiency Distribution in Low Voltage Driven Thin Film Electroluminescent Devices
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, we analyze the mechanism of the probe doped layer measurement to study the excitation efficiency distribution across the phosphor in thin film electroluminescent devices. The characteristics of excitation efficiency and its distributionacross the phosphor are measured in low voltage driven thin film elecIn this paper, we analyze the mechanism of the probe doped layer measurement to study the excitation efficiency distribution across the phosphor in thin film electroluminescent devices. The characteristics of excitation efficiency and its distributionacross the phosphor are measured in low voltage driven thin film electroluminescent devices fabricated in our laboratory. The experimental results prove that the excitation efficiency across the phosphor of the device is not homogeneous, and its variation depends on the applied voltage. We infer that the low-voltage-driven thin film electroluminescent mechanism is attributed to inhomgeneous distribution of electric field in the phosphor..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 97 (1997)
Optical Recording Performance of GeSb2Te4Phase Change Thin Film Material Using Short Wavelength (514.5 nm) Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The optical properties of monolayer GeSb 2Te 4 thin film prepared by vacuum RF sputtering method at the region 400～830 nm were studied. A comparatively large absorption was observed in the wavelength range of 400～600 nm. The optical storage characteristics of GeSb 2Te 4 thin film indicated that larger reflectivity contThe optical properties of monolayer GeSb 2Te 4 thin film prepared by vacuum RF sputtering method at the region 400～830 nm were studied. A comparatively large absorption was observed in the wavelength range of 400～600 nm. The optical storage characteristics of GeSb 2Te 4 thin film indicated that larger reflectivity contrast can be obtained at lower writing power Argon laser (514.5 nm) . The erasing reflectivity contrast is low, but it can be improved by multi layer films match..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 17, Issue 1, 102 (1997)
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