Journals >Chinese Journal of Lasers
Contents
2002
Volume: 29 Issue 6
24 Article(s)
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Research Article
Experimental Study of Acquisition with Antenna Scanning in Intersatellite Laser Links
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, the acquisition with the antenna scanning in intersatellite laser links was studied both in theory and simulation. A theorized model for acquisition was given, and some parameters that influence the system of acquisition were analyzed. In order to verify the analytical outcomes, a simulation system of thIn this paper, the acquisition with the antenna scanning in intersatellite laser links was studied both in theory and simulation. A theorized model for acquisition was given, and some parameters that influence the system of acquisition were analyzed. In order to verify the analytical outcomes, a simulation system of the acquisition in the laboratory was built. The results from the tests accord well with those from the theoretical analysis..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 498 (2002)
Algorithm and Accuracy Study of Wavefront Reconstruction with Different Amplification ratio Based On the Cyclic Radial Shearing Interferometer
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
A new algorithm of wavefront reconstruction based on the cyclic radial shearing interferomerter is given This is a technique that the actual wavefront can be reconstructed directly and accurately from the distribution of phase difference which is obtained from the radial shearing pattern by Fourier transform profilometA new algorithm of wavefront reconstruction based on the cyclic radial shearing interferomerter is given This is a technique that the actual wavefront can be reconstructed directly and accurately from the distribution of phase difference which is obtained from the radial shearing pattern by Fourier transform profilometry. By the numerical calculation and experiments, it is concluded that the new algorithm is credible and the accuracy of wavefront reconstruction with different amplification ratio is basically same based on this interferometer. It shows that this algorithm can be used to reconstruct accurately the distorted wavefront of ICF. A example of test of step structure is presented with different amplification ratio with He Ne laser..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 503 (2002)
Alignment of Grating Pair for Single-pulse Compression
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The compression of amplified chirped pulse by parallel grating pair is an important step in generating ultrashort ultrahigh intensity pulse. In this paper, for single pulse compression (30 min/shot), two methods are proposed in detail for the alignment of dual grating with large caliber (350 mm×185 mm×60 mm) The compression of amplified chirped pulse by parallel grating pair is an important step in generating ultrashort ultrahigh intensity pulse. In this paper, for single pulse compression (30 min/shot), two methods are proposed in detail for the alignment of dual grating with large caliber (350 mm×185 mm×60 mm) and dense grooves (1760 lp/mm). The shortcoming and advantage of two methods are compared with each other. In addiation, the related problems of the alignment are discussed..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 509 (2002)
Package Technique for CW 40 W 808 nm Quantum-well Linear Array Diode Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
The effects of indium solder coating and reflow soldering technique on diode bar soldering state are studied. Based on numerical simulation and experimental research, the design of cooler structure is optimized and the copper micro channels water cooler with low thermal resistance, low pressure is fabricated, which canThe effects of indium solder coating and reflow soldering technique on diode bar soldering state are studied. Based on numerical simulation and experimental research, the design of cooler structure is optimized and the copper micro channels water cooler with low thermal resistance, low pressure is fabricated, which can meet the needs of cooling diode laser with more than 60W thermal dissipating power. A CW linear array diode laser with output power of 40 W, wavelength of 808 nm, spectral width of less than 2 nm, E O efficiency of 40% is achieved by packaging experiment. The experiment of pumping Nd∶ YAG solid state laser by the diode is carried out. The output power is 11.8 W with single transverse mode and 30% optical optical efficiency at pumping power of 40 W..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 513 (2002)
Model Wavefront Reconstruction of Shack-Hartmann Sensor on Arbitrary Area and Wavefront Expression by Zernike Polynomials
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, based on the conception of cross product and space in the superior algebra theory, using the Zernike polynomial and the orthogonalization method, a method of Shack Hartmann Sensor's model wavefront reconstruction on arbitrary area is proposed through linear transform. Through linear reverse transformIn this paper, based on the conception of cross product and space in the superior algebra theory, using the Zernike polynomial and the orthogonalization method, a method of Shack Hartmann Sensor's model wavefront reconstruction on arbitrary area is proposed through linear transform. Through linear reverse transform, the wavefront can be expressed by Zernike polynomial easily..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 517 (2002)
Beam Transmission
Propagation and Amplification Process of X-ray Laser in Cylindrical Plasma-column
[in Chinese], [in Chinese], and [in Chinese]
By a simplified model of gain region, the propagation and amplification of capillary discharge X ray within the cylindrical plasma with linear eletron density profile are studied with the geometrical optics approximation. The angle of refraction and the relation between out put intensity and deflection angle are given.By a simplified model of gain region, the propagation and amplification of capillary discharge X ray within the cylindrical plasma with linear eletron density profile are studied with the geometrical optics approximation. The angle of refraction and the relation between out put intensity and deflection angle are given. The saturation length of X ray is given, too..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 537 (2002)
Biomedical Photonics and Laser Medicine
Research on the One-dimensional Rule of Instantaneous Temperature in Biological Tissue Caused By Laser Thermal Effect
[in Chinese]
One dimensional analytical expression of the instantaneous temperature in biological tissue under laser irradiation without considering the bloodstream cooling is derived. The temperature in biological tissue increases in exponent with time and decreases in exponent with the distance from laser irradiating area.One dimensional analytical expression of the instantaneous temperature in biological tissue under laser irradiation without considering the bloodstream cooling is derived. The temperature in biological tissue increases in exponent with time and decreases in exponent with the distance from laser irradiating area..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 565 (2002)
Holography and Information Processing
CO2 Laser Radar Initiative Scanning Imaging Experiment
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
This paper reported a CO2 laser scanning imaging demo system adopting the technology of scanning transmit, the same antenna for receiving and transmitting, heterodyne detection etc. The maximum operation distance of the system was calculated by using the radar distance equation. The imaging experiment with the targets This paper reported a CO2 laser scanning imaging demo system adopting the technology of scanning transmit, the same antenna for receiving and transmitting, heterodyne detection etc. The maximum operation distance of the system was calculated by using the radar distance equation. The imaging experiment with the targets 5 meters away indoor and the building 578 meters away, and the viewpoint ±2°×±1° is carried out. The outline picture of 10 frames per second, 32 rows per frame is obtained..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 569 (2002)
3D Reconstruction of Data Field of Laser Confocal Scanning Microscope
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper primarily researches the volume rendering of LCSM' data field. According to the property of its data field, a new lighting model of source spot lighting and the volume rendering method of Ti buffer are proposed. The experimental results show that this method is fit for LCSM system and can produce vivid 3This paper primarily researches the volume rendering of LCSM' data field. According to the property of its data field, a new lighting model of source spot lighting and the volume rendering method of Ti buffer are proposed. The experimental results show that this method is fit for LCSM system and can produce vivid 3D images..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 573 (2002)
Laser Manufacturing
Preparation of Mn/O Nanoparticles by Laser Heating Gas-evaporation Method
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Mn/O nanoparticles were prepared by laser heating gas evaporation method in this paper, with a 150 W CW CO 2 laser as light source and Mn(Ac) 2·4H 2O as a target. The effects of process parameters on nanoparticles have been pilot studied. XRD, DTA and TEM were used to characterize the samples. The formation mechanMn/O nanoparticles were prepared by laser heating gas evaporation method in this paper, with a 150 W CW CO 2 laser as light source and Mn(Ac) 2·4H 2O as a target. The effects of process parameters on nanoparticles have been pilot studied. XRD, DTA and TEM were used to characterize the samples. The formation mechanism of Mn/O nanoparticles was preliminarily discussed. The experimental results show that the process parameters such as laser power density, reaction pressure, the sorts and rate of airflows et al., effect the sizes and crystal system of nanoparticles., The products are Mn 3O 456F, the diameter of nanoparticles is between 5～10 nm and 30～100 nm in Ar atmosphere. The products are Mn 3O 4 and MnO and the diameter of nanoparticles is between 5～10 nm and 15～60 nm in O 2 atmosphere..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 553 (2002)
Microstructure Characteristic of Hypoeutectic White Cast Iron by Laser Surface Hardening
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The surface of the hypoeutectic white cast iron of great wearable work piece in common use was treated by laser hardening. The analysis and study laid emphasis on the microstructure characteristic of hypoeutectic white cast iron in order to resolve the difficult problems of low useful life and high brittleness.The surface of the hypoeutectic white cast iron of great wearable work piece in common use was treated by laser hardening. The analysis and study laid emphasis on the microstructure characteristic of hypoeutectic white cast iron in order to resolve the difficult problems of low useful life and high brittleness..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 557 (2002)
Application of Nd:YAG Laser on Visualization of Diesel Spray
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new system based on 532 nm wavelength Nd∶YAG laser, which is used in measuring concentration and drop diameter of diesel spray, has been developed in this paper. It has some advantages such as less configuration, high precision, and capacity in measuring real diesel spray. The 2 D concentration and drop diameter distA new system based on 532 nm wavelength Nd∶YAG laser, which is used in measuring concentration and drop diameter of diesel spray, has been developed in this paper. It has some advantages such as less configuration, high precision, and capacity in measuring real diesel spray. The 2 D concentration and drop diameter distribution is visualized by this system, and the approach correlation structure inside the spray is also discovered..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 561 (2002)
Laser Physics
Self-starting Kerr-lens Mode-locked Ti:Al2O3 Laser at Repetition Rates of 20 MHz
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
In this letter an approach to obtaining low repetition rate directly from a Kerr lens mode locked Ti∶Al 2O 3 laser by using a multiple pass cavity (MPC) is reported. A self starting mode locked laser (with a SESAM) generating pulses of 42 fs at a repetition rates of 20 MHz is obtained.In this letter an approach to obtaining low repetition rate directly from a Kerr lens mode locked Ti∶Al 2O 3 laser by using a multiple pass cavity (MPC) is reported. A self starting mode locked laser (with a SESAM) generating pulses of 42 fs at a repetition rates of 20 MHz is obtained..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 481 (2002)
Beam-quality Improved Diode Laser Beams in Aperiodic PPLN
[in Chinese], [in Chinese], and [in Chinese]
It is found that the spatial phase shift is induced by the harmonic beam in aperiodic PPLN with spatial walk off, so it can be engineered to compensate arbitrary spatial phase distortions of incident beam. By applying it to improve beam quality of diode laser beams, diffraction limited beam quality can be realized withIt is found that the spatial phase shift is induced by the harmonic beam in aperiodic PPLN with spatial walk off, so it can be engineered to compensate arbitrary spatial phase distortions of incident beam. By applying it to improve beam quality of diode laser beams, diffraction limited beam quality can be realized without scarifying the conversion efficiency..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 485 (2002)
LD-pumped Acousto-optic Q-switched Nd:YVO4 Laser with High Repetition Rates and Short Pulse Width
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An acousto optic Q switched diode pumped Nd∶YVO 4 laser at 1064 nm is reported here. When the repetition rate is 70 kHz, the maximum average output power of 6.45 W is obtained with an optical conversion efficiency of 34.9% and a slope efficiency of 37.3%. And the shortest pulse width of 7.9 ns is also obtained at the sAn acousto optic Q switched diode pumped Nd∶YVO 4 laser at 1064 nm is reported here. When the repetition rate is 70 kHz, the maximum average output power of 6.45 W is obtained with an optical conversion efficiency of 34.9% and a slope efficiency of 37.3%. And the shortest pulse width of 7.9 ns is also obtained at the same repetition. The highest single pulse energy of 213 μJ with peak power of 11.8 kW is generated at 10 kHz repetition rate..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 489 (2002)
LD-pumped Passively Q-switched Nd:YAG/LBO Green Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A LD pumped, Cr∶YAG passively Q switched Nd∶YAG/LBO green laser was reported in this paper. With 600 mW incident pump laser, Q switched green laser with average power of 27 mW, pulse width of 15 2 ns, repetition rate of 16 4 kHz and peak power of 108 1W was obtained.A LD pumped, Cr∶YAG passively Q switched Nd∶YAG/LBO green laser was reported in this paper. With 600 mW incident pump laser, Q switched green laser with average power of 27 mW, pulse width of 15 2 ns, repetition rate of 16 4 kHz and peak power of 108 1W was obtained..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 492 (2002)
Study on Conductive Cooling Repetitively Laser with Nil Drift Optics Axes
[in Chinese], [in Chinese], [in Chinese], [in Chinese]... and [in Chinese]|Show fewer author(s)
In this paper, study on optics axes drift character of conductive cooling Ce Nd∶YAG lasers has been carried out. Using Cr 4+ ∶YAG passive Q switched and directional prism cavity, it is demonstrated that the optics axes drift was nearly nil, lasers output was stability in airborne laser under the condition of 5 Hz workiIn this paper, study on optics axes drift character of conductive cooling Ce Nd∶YAG lasers has been carried out. Using Cr 4+ ∶YAG passive Q switched and directional prism cavity, it is demonstrated that the optics axes drift was nearly nil, lasers output was stability in airborne laser under the condition of 5 Hz working pulse, 7.35 J pump energy and continue working for 1 min..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 495 (2002)
Measurement and Metrology
Detection of Pulse Laser Signal with Avalanche Diode Detectors
[in Chinese], and [in Chinese]
Statistical properties of pulse laser signal detection using SiAPD as a detector has been theoretically studied, and the relation between the preset threshold and detection performance has been analyzed. Theoretical studies indicate that the threshold applied to the discriminator has the decisive influence on the detecStatistical properties of pulse laser signal detection using SiAPD as a detector has been theoretically studied, and the relation between the preset threshold and detection performance has been analyzed. Theoretical studies indicate that the threshold applied to the discriminator has the decisive influence on the detection performance. Analysis shows that primary photoelectrons and average gain of SiAPD determine the threshold scope within which it can guarantee the laser ranging systems detection probability and false alarm probability..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 541 (2002)
Research on the Surface Plasmon Resonance Fiber Optic Sensor for Cure Monitoring
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper introduces a simple and sensitive method to measure the refractive index and to monitor the cure of epoxy composite. This paper researches the method of testing the solutions with different refractive index. A probe head and the system to measure the refractive index of epoxy on line during the cure process This paper introduces a simple and sensitive method to measure the refractive index and to monitor the cure of epoxy composite. This paper researches the method of testing the solutions with different refractive index. A probe head and the system to measure the refractive index of epoxy on line during the cure process have been designed. The test result shows this system is credible, stable and the parameters tested are accord with the facts..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 545 (2002)
A Novel Means of Detecting Spectrum by Fourier Transform with Waveguide Holographic Grating
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel method is proposed to measure spectrum with waveguide holographic grating, based on fast Fourier transform for the interference pattern from the diffraction of light through the side of a fiber grating. The range of measurable optical wavelengths and resolvable wavelength interval are discussed with consideringA novel method is proposed to measure spectrum with waveguide holographic grating, based on fast Fourier transform for the interference pattern from the diffraction of light through the side of a fiber grating. The range of measurable optical wavelengths and resolvable wavelength interval are discussed with considering the period length of waveguide holographic grating and parameters of CCD detector. This method of spectrum measurement has the advantages of high resolution of spectrum, wide wavelength scope and simple structure etc..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 550 (2002)
Nonlinear Optics
Cascaded Nonlinear Phenomena of Second-order Nonlinear Crystal in F-P Cavity
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The transmission of 1064nm infrared pass through F P cavity, which has LBO second order nonlinear crystal inside was researched. The results show that the power density is increased obviously in LBO due to resonance of cavity. The cascaded second order nonlinear phenomena still can be observed in non single longitudinaThe transmission of 1064nm infrared pass through F P cavity, which has LBO second order nonlinear crystal inside was researched. The results show that the power density is increased obviously in LBO due to resonance of cavity. The cascaded second order nonlinear phenomena still can be observed in non single longitudinal mode continue wave 1064 nm beam with the input of 300 mW..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 521 (2002)
Third Harmonic Conversion of Aberrated Laser Beam
[in Chinese], and [in Chinese]
The third harmonic conversion of Type Ⅰ/Type Ⅱ angle duning scheme of KDP is affected by aberrations of fundamental waves is studied, including the nonuniform distribution across the aperture of refactive index, phase mismatch and etc., which are deduced by aberrations of fundamental waves. The results of transverse inThe third harmonic conversion of Type Ⅰ/Type Ⅱ angle duning scheme of KDP is affected by aberrations of fundamental waves is studied, including the nonuniform distribution across the aperture of refactive index, phase mismatch and etc., which are deduced by aberrations of fundamental waves. The results of transverse intensity distributions and conversion efficiencies of super Gaussian beam with aberrations of Zernike polynomials are presented..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 525 (2002)
Influence of Angle between Seed and Pump Beam on Brillouin Amplification
[in Chinese], [in Chinese], and [in Chinese]
Energy extraction efficiency, seed amplification factor, seed beam pulse width compression ratio and pump beam pulse width compression ratio versus angle between seed and pump beam at different energy ratio of seed to pump were experimentally investigated. When the angle between seed and pump was 1～2 mrad, energy extraEnergy extraction efficiency, seed amplification factor, seed beam pulse width compression ratio and pump beam pulse width compression ratio versus angle between seed and pump beam at different energy ratio of seed to pump were experimentally investigated. When the angle between seed and pump was 1～2 mrad, energy extraction efficiency, seed amplification factor, seed pulse width compression ratio and pump pulse width compression ratio were changed very small. Stokes seed and pump beam could be misaligned by 1～2 mrad..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 530 (2002)
Quantum Optics
Experiment of Diode Laser Pumped Rubidium Frequency Standards
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The preliminarily laser pumped Rb frequency standards have been described in this paper, some parameters have been measured. How to improve its stability is discussed.The preliminarily laser pumped Rb frequency standards have been described in this paper, some parameters have been measured. How to improve its stability is discussed..
Chinese Journal of Lasers
- Publication Date: Aug. 08, 2006
- Vol. 29, Issue 6, 533 (2002)
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