Journals >Chinese Journal of Lasers
Contents
1985
Volume: 12 Issue 5
18 Article(s)
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Research Article
Laser Devices and Laser Physics
Uniform illumination of large focal targets using a lens array
Deng Ximing, Liang Xiangchun, Chen Zezun, Yu Wenyan, and Ma Renyong
Inserting an array composed of nearly one hundred similar lenses into a common focal system, the uniformity of the illumination of a target can evidently be improved without being affected by the near field distribution of laser beams.We report here the analyses of geometrical and physical optics of the lens array and Inserting an array composed of nearly one hundred similar lenses into a common focal system, the uniformity of the illumination of a target can evidently be improved without being affected by the near field distribution of laser beams.We report here the analyses of geometrical and physical optics of the lens array and compare them with the experimental results..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 257 (1985)
Effect of amplified spontaneous emission on space coherence of the XeCl laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this article, the space coherence of XeCl laser is measured with various cavity Q using Young’s experiment. It shows than the amplified spontaneous emission (ASE) is the important factor which affects the space coherence of XeCl lasers. Such influence can be suppressed effectively by properly choosing the reflectiviIn this article, the space coherence of XeCl laser is measured with various cavity Q using Young’s experiment. It shows than the amplified spontaneous emission (ASE) is the important factor which affects the space coherence of XeCl lasers. Such influence can be suppressed effectively by properly choosing the reflectivity R of the cavity output mirror..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 261 (1985)
Thermal stability of parallel-plane resonator with an internally thermal thick lens
Wang Xiaojing
Optical pumping of solid-state lasers will induce axial thermal elongation and radial gradient of refractive index in the laser rod, which may be summarized as an effect of thermal thick lens. The insensitive condition of the parallel-plane resonator to thermal thick lens is directly derived by the derivative of beam sOptical pumping of solid-state lasers will induce axial thermal elongation and radial gradient of refractive index in the laser rod, which may be summarized as an effect of thermal thick lens. The insensitive condition of the parallel-plane resonator to thermal thick lens is directly derived by the derivative of beam spot size to the focal length of thermal lens at the output mirror of the resonator and the limitation for application is discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 266 (1985)
Investigation on the characteristics of the flash-lamp pumped planar waveguide dye laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Tuning characteristics of the planar waveguide dye laser driven by xenon flashlamps are described. With a planar structure, a narrow bandwidth of down to 8 GHz (FWHM), tuning range of 46.0 nm and tuning .effiicency of 85% have been obtained using Rhodamine 6G. The beam divergency of this laser has been measured.Tuning characteristics of the planar waveguide dye laser driven by xenon flashlamps are described. With a planar structure, a narrow bandwidth of down to 8 GHz (FWHM), tuning range of 46.0 nm and tuning .effiicency of 85% have been obtained using Rhodamine 6G. The beam divergency of this laser has been measured..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 271 (1985)
High power pulsed dye laser oscillator-amplifiers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A dye laser with: a double-prism pf one dimensional beam-expander, which is longitudinally pumped by a frequency doubled Nd: YAG laser, is reported. The total efficiency of the dye laser after two stages of amplification is 31% for Rh6G. Then the energy of pumping beam was 40 mJ, tunable dye laser output of 12.2mJ (2MWA dye laser with: a double-prism pf one dimensional beam-expander, which is longitudinally pumped by a frequency doubled Nd: YAG laser, is reported. The total efficiency of the dye laser after two stages of amplification is 31% for Rh6G. Then the energy of pumping beam was 40 mJ, tunable dye laser output of 12.2mJ (2MW) Tith a line width of 0.12A was obtained. The quality of laser output beam was good. The repetition was 10Hz when a circulating system was used..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 275 (1985)
Pulsed laser-induced chemical reaction of porphyrins
Wang Wenyun, Ming Chang Jiang, Hou Yaowu, Jang Tanheng, Sheng Mingtao, and Zhou Zhewu
The effect of pulsed nanosecond radiation from a frequency doubled Nd:YAG laser on several porphyrins in three solvents (chloroform, benzene, methanol) has been studied. For all three porphyrins (PPM, HPM, TPP), only irradiation in CHCl3 solutions can bring about the appearance of new spectra and the disappearance of oThe effect of pulsed nanosecond radiation from a frequency doubled Nd:YAG laser on several porphyrins in three solvents (chloroform, benzene, methanol) has been studied. For all three porphyrins (PPM, HPM, TPP), only irradiation in CHCl3 solutions can bring about the appearance of new spectra and the disappearance of original ones, but never in benzene or methanol solutions. The resulting products have been identified as the corresponding protonated porphyrins. We assume that the dielectric breakdown of chloroform most probably accounts for the reaction pathway..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 279 (1985)
Study of kinetic process for F-center formation in LiF crystals by ESR
Fu Wenbiao, and Li Shenhua
The paper reports the study of kinetic process for F-centcr formation in LiF crystals irradiated with y-ray by ESE. The experiment shows that VK-center is formed at first and then F-center when VK-center is disintegrated. The cause for center formation and its transformation are discussed and explained.The paper reports the study of kinetic process for F-centcr formation in LiF crystals irradiated with y-ray by ESE. The experiment shows that VK-center is formed at first and then F-center when VK-center is disintegrated. The cause for center formation and its transformation are discussed and explained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 283 (1985)
A multiexposure-multiaperture method of laser speckle photography
Chen Tanping
A method using the frequency divtion multiplexing technique of the laser speckle’s spatial frequency to record multiple displacement information on a single specklegram is presented. The full-field fringes corresponding to each deformation of an object can be obtained respectively by optical filtering. An example is giA method using the frequency divtion multiplexing technique of the laser speckle’s spatial frequency to record multiple displacement information on a single specklegram is presented. The full-field fringes corresponding to each deformation of an object can be obtained respectively by optical filtering. An example is given and the operating procedure is described briefly..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 287 (1985)
Analysis for signals and noises of 90° Thomson scattering experiment——Key points in optical design of 90° Thomson scattering apparatus for CT-6B Tokamak
Hu Shuqin
In this paper the signals and noises obtained in90° Thomson scattering experiment on Tokamak are analysed. A ruby laser was used in the experiment as light source, and high scattering signal level and high signal-to-noise ratio were obtained with the apparatus. The key points in the optical design of 90°?ThomIn this paper the signals and noises obtained in90° Thomson scattering experiment on Tokamak are analysed. A ruby laser was used in the experiment as light source, and high scattering signal level and high signal-to-noise ratio were obtained with the apparatus. The key points in the optical design of 90°?Thomson scattering apparatus for CT-6B Tokamak are explained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 292 (1985)
Automatic thermal balance and compensation of laser calorimeters
Zhou Fuzheng, Shen Liqing, Wang Ruihua, and Li Ruiming
The method of automatic thermal balance and compensation of laser calorimeters is presented and the correspoding circuit has been fabricated. Using this technique, "zero drift" is reduced by two orders of magnitude and detectivity of energy increased by 20 times.The method of automatic thermal balance and compensation of laser calorimeters is presented and the correspoding circuit has been fabricated. Using this technique, "zero drift" is reduced by two orders of magnitude and detectivity of energy increased by 20 times..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 298 (1985)
Measurement of two dimensional light intensity
Jin Honghou, and Xu Shaoji
This paper reports a testing set up for two dimensional image measurement controlled by a microcomputer, its application to the laser experiment and the optical inspection.This paper reports a testing set up for two dimensional image measurement controlled by a microcomputer, its application to the laser experiment and the optical inspection..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 302 (1985)
Treatment of exophthalmic goiter with laser acupuncture and moxibastion and preliminary study on its mechanism
Ge Tongyuan, Du Jiong, and Shi Xiuqin
This paper reports the method and eflect of treatment for exophthalmic goiter with laser acupuncture and moxibastion. Preliminary study on the mechanism is made by determing the immunity body fluid level and the thyroid hormone level (T3, T4).This paper reports the method and eflect of treatment for exophthalmic goiter with laser acupuncture and moxibastion. Preliminary study on the mechanism is made by determing the immunity body fluid level and the thyroid hormone level (T3, T4)..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 305 (1985)
[in Chinese]
[in Chinese], [in Chinese], and [in Chinese]
In order to measure the pulse width of a mode-locked Ar+ laser in the absence of high speed photodiode and wide band oscilloscope, a zxtw 45°/90° cut KDP plate was designed to be cooled down to-(13.5± 0.1)℃ in a refrigarator, phase matching for 5145 A was achieved and the pulse width can be exactly deterIn order to measure the pulse width of a mode-locked Ar+ laser in the absence of high speed photodiode and wide band oscilloscope, a zxtw 45°/90° cut KDP plate was designed to be cooled down to-(13.5± 0.1)℃ in a refrigarator, phase matching for 5145 A was achieved and the pulse width can be exactly determined by SHG- method..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 308 (1985)
[in Chinese]
[in Chinese], and [in Chinese]
When a photodiode array is connected with the computer, we can accurately measure spatial and temporal change of the laser beam. Some He-Ne laser beams have been tested with this device.When a photodiode array is connected with the computer, we can accurately measure spatial and temporal change of the laser beam. Some He-Ne laser beams have been tested with this device..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 310 (1985)
[in Chinese]
[in Chinese], [in Chinese], and [in Chinese]
The pyrolysis of coal of different ranks has been examined by chromatographic technique. The results obtained reveal that the ratio of C2H4/CH4 in gaseous products is linearly related to the content of volatile fraction of coal. This fact suggests that this technique offers a simpler approach instead of the routine metThe pyrolysis of coal of different ranks has been examined by chromatographic technique. The results obtained reveal that the ratio of C2H4/CH4 in gaseous products is linearly related to the content of volatile fraction of coal. This fact suggests that this technique offers a simpler approach instead of the routine methods for tho evaluation of the characteristic parameter-content of volatile matter in coal of different origins..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 312 (1985)
[in Chinese]
[in Chinese], [in Chinese], and [in Chinese]
In this paper the independent use of N2 laser to treat two cases of recurrent maxillary sinus squamous cell carcinoma is reported. After the treatment tumours disappeared, and for one case no recurrence was found by following up for five years. The patient is in good health.In this paper the independent use of N2 laser to treat two cases of recurrent maxillary sinus squamous cell carcinoma is reported. After the treatment tumours disappeared, and for one case no recurrence was found by following up for five years. The patient is in good health..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 315 (1985)
[in Chinese]
[in Chinese], and [in Chinese]
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 12, Issue 5, 317 (1985)
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