Journals >Chinese Journal of Lasers
Contents
2000
Volume: 27 Issue 8
21 Article(s)
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Holography and Information Processing
Implementaion of Anamorphic FRT Using HOE
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Implementation of anamorphic FRT using HOE is presented. A holographic anamorphic cylindrical lens, which has different focus length along two perpendicular directions, is made. The focus length in different direction is able to change according to the conditions of the recording procedure. FRT with different fractionaImplementation of anamorphic FRT using HOE is presented. A holographic anamorphic cylindrical lens, which has different focus length along two perpendicular directions, is made. The focus length in different direction is able to change according to the conditions of the recording procedure. FRT with different fractional order along the different direction can be realized using this HOE. The condition to realising FRT using this HOE is discussed. A new optical security system is composed based on this HOE and the experiment results are given..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 719 (2000)
Two Signal Phase Modulation for SBS Suppression in Optical Fiber CATV Transmission System
[in Chinese], and [in Chinese]
Stimulated Brillouin Scattering (SBS) suppression is one of the key technology in optical fiber AM-CATV externally modulated transmission system. In this paper, a novel two signal phase modulation for SBS suppression is presented. The theoretical analysis and calculation have shown that the two signal phase modulation Stimulated Brillouin Scattering (SBS) suppression is one of the key technology in optical fiber AM-CATV externally modulated transmission system. In this paper, a novel two signal phase modulation for SBS suppression is presented. The theoretical analysis and calculation have shown that the two signal phase modulation is more efficient than the single signal phase modulation for the increase of SBS threshold. The choice of frequency in two signal phase modulation is also analyzed and calculated in this paper..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 724 (2000)
An “Electronic Guard” System Based on the Volume Holographic Storage Technology
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An optical image recognition system based on the volume holographic storage technology is constructed. It is applied to an “electronic guard” system based on the real-time human face recognition. It changes the conventional discriminating rule according to the intensities of the correlation peaks in volume holographic An optical image recognition system based on the volume holographic storage technology is constructed. It is applied to an “electronic guard” system based on the real-time human face recognition. It changes the conventional discriminating rule according to the intensities of the correlation peaks in volume holographic storage correlator, and uses the multivariate discriminant analysis based classification method so that the distortion invariance recognition ability is improved..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 729 (2000)
Abstraction and Combination of Image Character by Multi-frequency Channel Wavelet Transform
[in Chinese], and [in Chinese]
According to the principle of simulating visual information abstracting based on wavelet transform, it is analyzed and discussed that there are multi-frequency channels in the human vision system in this paper. The image character of a tooth X-ray film is abstracted and combined by multi-frequency channel wavelet transAccording to the principle of simulating visual information abstracting based on wavelet transform, it is analyzed and discussed that there are multi-frequency channels in the human vision system in this paper. The image character of a tooth X-ray film is abstracted and combined by multi-frequency channel wavelet transform in a typical optical 4f system..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 733 (2000)
Study of the Detection Method Using the Intensity Dividing Readout for the Magneto-optical Disks
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The intensity dividing readout (IDR) method for magneto-optical disks is analytically discussed. Compared with the differential readout method, the IDR method can eliminate the influence of the fluctuation of the laser power and the reflectivity on the thin film. Experimental results show that it′s a useful measuring mThe intensity dividing readout (IDR) method for magneto-optical disks is analytically discussed. Compared with the differential readout method, the IDR method can eliminate the influence of the fluctuation of the laser power and the reflectivity on the thin film. Experimental results show that it′s a useful measuring method for evaluating magneto-optic media in the static test..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 737 (2000)
Optical Modulation Characteristics of Liquid Crystal Television (LCTV) and Its Application in Optics Information Processing
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Both the amplitude and phase optical modulation characteristics of Epson liquid crystal television are studied using the optical measures. The experiment results of the real-time reconstruction of computer-generated hologram and real-time recognition of VanderLugt correlator are also given in the paper.Both the amplitude and phase optical modulation characteristics of Epson liquid crystal television are studied using the optical measures. The experiment results of the real-time reconstruction of computer-generated hologram and real-time recognition of VanderLugt correlator are also given in the paper..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 741 (2000)
Laser Manufacturing
Study on Measurement Technique of Scattering-surface Displacement Utilizing Laser Doppler Effect
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A measurement system of scattering-surface displacement utilizing laser Doppler effect is discussed. Lock-in amplifier (LIA) and phase-locked loop (PLL) are used in signal processing. The lateral displacement measurement at the long-distance of 10 meters was realized.A measurement system of scattering-surface displacement utilizing laser Doppler effect is discussed. Lock-in amplifier (LIA) and phase-locked loop (PLL) are used in signal processing. The lateral displacement measurement at the long-distance of 10 meters was realized..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 751 (2000)
Study of Surface Mechanical Properties of Laser Shock Processed Austenitic Steel and Ni-based Superalloy
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The effect of laser shock processing on the microstructure, hardness and residual stress of an austenitic steel 1Cr18Ni9Ti and a Ni-base superalloy GH30 is studied as a functions of laser shock processing variables. Results show that high density of dislocations and deformation twins are produced in the laser shock proThe effect of laser shock processing on the microstructure, hardness and residual stress of an austenitic steel 1Cr18Ni9Ti and a Ni-base superalloy GH30 is studied as a functions of laser shock processing variables. Results show that high density of dislocations and deformation twins are produced in the laser shock processed zone of both the austenitic steel 1Cr18Ni9Ti and the nickel-based superalloy GH30. Extensive strain-induced martensite plates are also observed in the laser shock processed zone of the austenitic steel surface. The hardness and compressive stress of the laser shock processed surface are significantly increased for both of the test materials..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 756 (2000)
Study of Laser Welding Technology on Diamond Circular Saw Blade
[in Chinese], and [in Chinese]
A laser welding technology of diamond saw blade is studied. By inserting a transitional layer between the 65Mn saw core and segments, a compatible technique to get high welding performance is obtained.A laser welding technology of diamond saw blade is studied. By inserting a transitional layer between the 65Mn saw core and segments, a compatible technique to get high welding performance is obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 761 (2000)
Study of HpD Two-photon Fluorescence of Cancer Tissue Stimulated by Femtosecond Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper a new method, that is, studying in vitro HpD two-photon fluorescence of cancer tissue using stimulation of femtosecond laser is reported. Femtosecond optical pulse generated by self-mode-locked Ti:sapphire laser stimulates cancer tissue of little mouse injected HpD. The spectrum of two-photon fluorescenceIn this paper a new method, that is, studying in vitro HpD two-photon fluorescence of cancer tissue using stimulation of femtosecond laser is reported. Femtosecond optical pulse generated by self-mode-locked Ti:sapphire laser stimulates cancer tissue of little mouse injected HpD. The spectrum of two-photon fluorescence of HpD is observed. But there is no such spectrum in the corresponding normal tissue. The experiment shows that the method will be an effective method in diagnosing cancer field..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 765 (2000)
Laser Physics
A 480 kV Experiment of Pseudospark Beam Source for Free Electron Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The experiment of pseudospark discharge is discussed in this article. The discharging gas in the switch of Marx generator is changed and hence the stability of discharge is enhanced. The insulation oil outside pseudospark discharge chamber is improved, then the beam with energy of 480 keV and beam current of 13 kA is oThe experiment of pseudospark discharge is discussed in this article. The discharging gas in the switch of Marx generator is changed and hence the stability of discharge is enhanced. The insulation oil outside pseudospark discharge chamber is improved, then the beam with energy of 480 keV and beam current of 13 kA is obtained. The transmission distance of beam is 75 cm. It proves that wiggler field can improve the focusing quality of beam greatly..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 673 (2000)
Study of the Characteristics of Laser Diode with Fiber Bragg Grating External Cavity
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A high power, narrow linewidth single frequency laser diode as one of the key elements of Integrated Optical Rotation Sensor (IORS) is studied. Both theoretical analysis and experimental research show that in order to achieve 1°/h resolution for rotation sensing, a strong optical feedback fiber Bragg grating laserA high power, narrow linewidth single frequency laser diode as one of the key elements of Integrated Optical Rotation Sensor (IORS) is studied. Both theoretical analysis and experimental research show that in order to achieve 1°/h resolution for rotation sensing, a strong optical feedback fiber Bragg grating laser diode (FBG-LD) with linewidth less than 1 MHz is selected as a light source of IORS. The characteristics of FBG-LD with strong optical feedback is analyzed for ensuring high power, single longitudinal mode, and narrow linewidth operation. Especially, the influence of the residual reflectivity of the feedback face on the power of FBG-LD is presented, and the effect of the coupling efficiency to the linewidth of FBG-LD is emphasized in this paper. A high power, narrow linewidth single frequency FBG-LD is designed and developed. Furthermore, the FBG-LD is applied in the experimental setup of IORS. The measured finesse of the resonator coincides with the calculated value..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 677 (2000)
Theoretical Design Method of 980nm Strained Single Quantum Well
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A calculation method of strained single quantum well width is introduced. For a given material components, the width of 980 nm strained single quantum well is calculated according to the theory of strained effect and the processing method of the limited depth quantum well. The calculation value is in accord with the exA calculation method of strained single quantum well width is introduced. For a given material components, the width of 980 nm strained single quantum well is calculated according to the theory of strained effect and the processing method of the limited depth quantum well. The calculation value is in accord with the experiment result..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 682 (2000)
Study on Optical Characteristics of InGaAsP/GaAs SQW Lasers
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Al-free InGaAsP/GaAs single quantum well separate confinement heterostructures have been grown by liquid phase epitaxy (LPE). The measurements showed that the far-field distribution was approximately a Gaussian profile. The refractive index profile of dielectric optical waveguides was analyzed by theory of grading waveAl-free InGaAsP/GaAs single quantum well separate confinement heterostructures have been grown by liquid phase epitaxy (LPE). The measurements showed that the far-field distribution was approximately a Gaussian profile. The refractive index profile of dielectric optical waveguides was analyzed by theory of grading waveguide. The work is useful for improving the beam quality..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 687 (2000)
Mid-infrared Parametric Oscillator with 3.76 μm Output
[in Chinese], and [in Chinese]
By using electro-optic Q-switched, flash-lamp-pumped 1.06 μm Nd:YAG laser as a pumping source, a 3.76 μm mid-infrared laser was generated from a LiNbO3 parametric oscillator. Output energy of 7 mJ per pulse at 5 Hz was observed.By using electro-optic Q-switched, flash-lamp-pumped 1.06 μm Nd:YAG laser as a pumping source, a 3.76 μm mid-infrared laser was generated from a LiNbO3 parametric oscillator. Output energy of 7 mJ per pulse at 5 Hz was observed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 691 (2000)
All-solid-state Nd:YVO4 Ring Laser of Single-frequency Operation
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The ring laser of diode laser pumped Nd:YVO4 crystal has been obtained by an optic coupling system. Four mirrors ring resonator was adopted. The optic diode consists of a TGG crystal and a half-wave plate placed in cavity. With KTP crystal for intracavity frequency-doubling, the green light with maximum output power ofThe ring laser of diode laser pumped Nd:YVO4 crystal has been obtained by an optic coupling system. Four mirrors ring resonator was adopted. The optic diode consists of a TGG crystal and a half-wave plate placed in cavity. With KTP crystal for intracavity frequency-doubling, the green light with maximum output power of 40 mW and the optical conversion efficiency of 6% was obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 694 (2000)
Sinh-Gaussian Beams and Their Transformation Properties
[in Chinese], [in Chinese], and [in Chinese]
The transformation of Sinh-Gaussian (ShG) beams passing through a paraxial optical ABCD system has been studied in detail, and closed-form transformation expressions for both unapertured and apertured cases have been derived. Typical numerical calculation results have been given to illustrate the transformation propertThe transformation of Sinh-Gaussian (ShG) beams passing through a paraxial optical ABCD system has been studied in detail, and closed-form transformation expressions for both unapertured and apertured cases have been derived. Typical numerical calculation results have been given to illustrate the transformation properties of ShG beams..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 697 (2000)
Study on Cross-phase Modulation Induced Chirp
[in Chinese], [in Chinese], and [in Chinese]
Considering the fiber loss, an analytic expression of the cross-phase modulation induced chirp is derived. Evolution of chirp is simulated by computer and chirp as a function of the fiber loss and group-velocity mismatch is analysed. The results show that the chirp is little affected by the fiber loss and largely affecConsidering the fiber loss, an analytic expression of the cross-phase modulation induced chirp is derived. Evolution of chirp is simulated by computer and chirp as a function of the fiber loss and group-velocity mismatch is analysed. The results show that the chirp is little affected by the fiber loss and largely affected by the group-velocity mismatch; the chirp tend to stable evolved in the fiber..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 703 (2000)
Thermal Stress Damage of Semiconductors Induced by Laser Beam
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The problems of temperature rise and thermal stress damage of semiconductors material induced by chemical laser beam are studied by using a numerical and analytical method. Thermal stress and temperature rise distributions at different laser parameters of detector material are calculated. The thermal stress damage threThe problems of temperature rise and thermal stress damage of semiconductors material induced by chemical laser beam are studied by using a numerical and analytical method. Thermal stress and temperature rise distributions at different laser parameters of detector material are calculated. The thermal stress damage threshold of detector material induced by laser beam is obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 709 (2000)
A Way of Variable Coupling Parameters in the Green Light Problem
[in Chinese]
Considering the relationships between the parameter and the initial condition of the variables in intracavity-doubled Nd:YAG lasers, some problems under the Bear′s theory are pointed out. A new way of variable cross saturation parameter from coupling between the modes is put forward. The results about numerically calcuConsidering the relationships between the parameter and the initial condition of the variables in intracavity-doubled Nd:YAG lasers, some problems under the Bear′s theory are pointed out. A new way of variable cross saturation parameter from coupling between the modes is put forward. The results about numerically calculating the bifurcation diagram in the variable space of the system and the power spectrum under the some controlling parameter in the intracavity doubled Nd:YAG lasers pumped by krypton arc flashlamp are given..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 714 (2000)
Materials and Thin Films
Investigation on the Electro-optic Properties and the Relaxation of Electric Poled Dye Doped Polymer Films
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The elliptical reflection method was used to measure the electro-optic coefficient of doped α′-cyano-4′-nitro-4-N,N-dimethylstibene (CNDS)/PMMA films. The decay of electro-optic signal of CNDS/PMMA films with an coated Al electrode was measured in situ. A slow relaxation process was observed in the first few hours of tThe elliptical reflection method was used to measure the electro-optic coefficient of doped α′-cyano-4′-nitro-4-N,N-dimethylstibene (CNDS)/PMMA films. The decay of electro-optic signal of CNDS/PMMA films with an coated Al electrode was measured in situ. A slow relaxation process was observed in the first few hours of the decay. Possible reasons were discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 27, Issue 8, 746 (2000)
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