Journals >Chinese Journal of Lasers
Contents
1993
Volume: 20 Issue 2
18 Article(s)
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Research Article
Experimental verification of two-level synthetic wavelength component scheme of infrared band dual-line He-Ne laser
[in Chinese]
The two-lwvel synthetic wavelength component scheme of 3. 39μm band dual-line He-Ne laser for large length interferometry without carriage guideway is tested and verified by using infrared heatwave interferometer. The principle of the infrared heatwave interferometer used in the experiment is presented. The experimentaThe two-lwvel synthetic wavelength component scheme of 3. 39μm band dual-line He-Ne laser for large length interferometry without carriage guideway is tested and verified by using infrared heatwave interferometer. The principle of the infrared heatwave interferometer used in the experiment is presented. The experimental data are given and analyzed. This work provids experimental basis for the large length measurement scheme enploying 3. 39μm dual-line He-Ne laser..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 89 (1993)
Simple measurement of power density distribution of high power laser
[in Chinese]
In this article, we present a practical methode which can be used to measure the density distribution of CW mechanism are analysed in detail.In this article, we present a practical methode which can be used to measure the density distribution of CW mechanism are analysed in detail..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 93 (1993)
Ganeration of 1st and 2nd anti-Stokes backward SRS in H2
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper reports the generation of the 1st and 2nd anti-Stokes components of the backward SRS in H2, analyzes the mechanism of their generation and compares the properties of the backward SRS with those of the forward SRS.This paper reports the generation of the 1st and 2nd anti-Stokes components of the backward SRS in H2, analyzes the mechanism of their generation and compares the properties of the backward SRS with those of the forward SRS..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 98 (1993)
Stimulated Raman scattering of H2pumped by KrF laser
[in Chinese], [in Chinese], and [in Chinese]
Stimulated Raman scattering is observed when high-pressure H2 is pumped by KrF laser. The Stokes beams and anti-Stokes beams are compressed. The first Stokes beam is 1/3 of that of the pumping beam. And the effect of buffer gas on conversion efficiency of Stokes beams is studied.Stimulated Raman scattering is observed when high-pressure H2 is pumped by KrF laser. The Stokes beams and anti-Stokes beams are compressed. The first Stokes beam is 1/3 of that of the pumping beam. And the effect of buffer gas on conversion efficiency of Stokes beams is studied..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 102 (1993)
Relative refractive index variation spectra of a GaAs film and its effect on optical switch characteristic
[in Chinese]
The relative variation spectra of reflectivity induced by injected carrier in an undoped GaAs film at 820～900 nm rangs are measured experimentally. The relative variation spectrum of refractive index are also obtained using above results. The above results effect on optical switch characteristic are analyzed.The relative variation spectra of reflectivity induced by injected carrier in an undoped GaAs film at 820～900 nm rangs are measured experimentally. The relative variation spectrum of refractive index are also obtained using above results. The above results effect on optical switch characteristic are analyzed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 107 (1993)
Laser-induced transient photoacoustic and photothermal waves in thin films of material
[in Chinese], [in Chinese], and [in Chinese]
Photoacoustic wave with frequency of GHz and corresponding detection were researched. The PA in materials was excited by a mode-locked laser. The thickness of thin material was measured no- destructively by echo analysis. Also the laser induced photothermal wave studied. The measurement of sink energy can be used to ilPhotoacoustic wave with frequency of GHz and corresponding detection were researched. The PA in materials was excited by a mode-locked laser. The thickness of thin material was measured no- destructively by echo analysis. Also the laser induced photothermal wave studied. The measurement of sink energy can be used to illustrate damage mechanism of material..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 112 (1993)
Collapse and revival effect of atomic inversion in the multiphotonJaynes-Cummings model
[in Chinese]
The general time-dependent atomic inversion operator in the multiphoton Jaynes-Cummings model has been exactly solved, its collapse and revival behavior has been approximately analyised, and the collapse and revival times have been obtained by means of some simple techniqes.The general time-dependent atomic inversion operator in the multiphoton Jaynes-Cummings model has been exactly solved, its collapse and revival behavior has been approximately analyised, and the collapse and revival times have been obtained by means of some simple techniqes..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 117 (1993)
Analysis of pressure sensitivity in interferometric fiber optic hydrophone
[in Chinese], [in Chinese], and [in Chinese]
The pressure sensitivity of phase in optical fibers has been studied analytically in detail. This analysis shows that it is unreasonable solve the problem with hydrostatic model.The pressure sensitivity of phase in optical fibers has been studied analytically in detail. This analysis shows that it is unreasonable solve the problem with hydrostatic model..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 146 (1993)
Biomedical Photonics and Laser Medicine
308 nm laser-induced fluorescence spectra of animal blood vessel
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A XeCl excimer laser at 308 nm was used to irradiate rabbit's dog's aorta and different organs. Fluorescence spectra indicated a broad-continuum emission from 300 to 700 nm with the peak fluorescence at wavelengths of 380 and 450 nm. The ratio of peak fluorescence intensity is I380/I450=1.05±0.07 for nomalA XeCl excimer laser at 308 nm was used to irradiate rabbit's dog's aorta and different organs. Fluorescence spectra indicated a broad-continuum emission from 300 to 700 nm with the peak fluorescence at wavelengths of 380 and 450 nm. The ratio of peak fluorescence intensity is I380/I450=1.05±0.07 for nomal artery, I380/I450=1.32±0.10 for atheromas plagues..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 136 (1993)
Monte Carlo simulation of LDV of skin blood flow
[in Chinese], [in Chinese], and [in Chinese]
Light propagation in two-layered skin mode was simulated with Monte Carlo calculation using two diferent phase functions to give the photon-RBC (red blood cell) scattering angles for comparision. Results include:the intensity distribution of detected photons, the dependence of photon number on frequency shift, the depeLight propagation in two-layered skin mode was simulated with Monte Carlo calculation using two diferent phase functions to give the photon-RBC (red blood cell) scattering angles for comparision. Results include:the intensity distribution of detected photons, the dependence of photon number on frequency shift, the dependence of total frequency shift and mean frequency shift on RBC concentration. The results show that the linear dependence of total frequency shift on RBC concentration is valid only when the concentration is low. At low concentration the first moment F and the first weighted moment (Δf)s of the spectral power density of intensity fluctuation reflect RBC's mean velocity while at high concentration they reflect RMS (root-mean square) velocity..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 140 (1993)
Study of ultraviolet-induced photochemical damage in rabbits' corneal irradiated with 308 nm XeCl excimer laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Investigation of Chinchilla rabbits' corneal losions induced by 308 nm excimer laser was presented. The damage mechanism was the same as photo-chemical and there were two phases of reaction of immediate damage and delayed ones. By statistical analysis, the immediately corneal injury threshold (ED50) of 0.485 J/cm2 Investigation of Chinchilla rabbits' corneal losions induced by 308 nm excimer laser was presented. The damage mechanism was the same as photo-chemical and there were two phases of reaction of immediate damage and delayed ones. By statistical analysis, the immediately corneal injury threshold (ED50) of 0.485 J/cm2 was obtained and its 90% confidence limit was 0.349～0.608 J/cm2. The delayed reaction appeared 6～18 hours after the irradiation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 156 (1993)
Laser Manufacturing
A numerical simulation model of SMT laser microsolder thermal process
[in Chinese], [in Chinese], and [in Chinese]
In this paper, a numerical simulation of thermal process on the SMT laser microsoldering joint has been developed, in which, the influence on thermal process of the factors such as the thermal conductivity, variation of solder with temperature, light reflection coefficient of the lead wire surface, and heat exchange onIn this paper, a numerical simulation of thermal process on the SMT laser microsoldering joint has been developed, in which, the influence on thermal process of the factors such as the thermal conductivity, variation of solder with temperature, light reflection coefficient of the lead wire surface, and heat exchange on the surface of SMT materials have all been considered. In order to carry this numerical calculation practice and prove it' s results, the reflexive characteristic of light wave to the SMT materials has been gauged temperature process of laser microjoint has been measured..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 126 (1993)
Laser welding of stainless steel tubes and tube plates
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Laser deep-penetration welding of stainless steel is experimentally studied. An optical system permitting rotation of focused laser beam for welding stationary tubes and tube plates has been developed. The quality of welded joints meets the demands of preasure container and the welding efficiency is raised greatly.Laser deep-penetration welding of stainless steel is experimentally studied. An optical system permitting rotation of focused laser beam for welding stationary tubes and tube plates has been developed. The quality of welded joints meets the demands of preasure container and the welding efficiency is raised greatly..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 132 (1993)
Laser Physics
A 1.5 μm InGaAsP mode-locked laser emitting ps light pulse
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Sturctrue and fabrication of 1.5 μm InGaAsP mode-locked laser are described. Emphasis is placed on its characteristics under CW and mode-locking conditions. 18.8 ps ultrashort light pulse are obtained at 960 MHz.Sturctrue and fabrication of 1.5 μm InGaAsP mode-locked laser are described. Emphasis is placed on its characteristics under CW and mode-locking conditions. 18.8 ps ultrashort light pulse are obtained at 960 MHz..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 81 (1993)
Experimental study of CW tunable Ti-sapphire laser
[in Chinese], [in Chinese], and [in Chinese]
The design consideration of CW tunable Ti-sapphire laser is discussed. The constraction parameters and some experimental results are presented. The pumping threshold is of less than 1 W. The output power is up to 1.35 W with an efficiency of 15% and a tuning range of 715～880 nm.The design consideration of CW tunable Ti-sapphire laser is discussed. The constraction parameters and some experimental results are presented. The pumping threshold is of less than 1 W. The output power is up to 1.35 W with an efficiency of 15% and a tuning range of 715～880 nm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 85 (1993)
Generation of UV ultrashort pulses in LBO crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By sum-frequency mixing of fourth harmonic of a mode-locked Nd:YAG laser with stimulated Raman scattering beam emitted from acetone in LBO crystal, we have obtained ultrashort laser pulse at 227nm.By sum-frequency mixing of fourth harmonic of a mode-locked Nd:YAG laser with stimulated Raman scattering beam emitted from acetone in LBO crystal, we have obtained ultrashort laser pulse at 227nm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 150 (1993)
Materials and Thin Films
Spectroscopic properties of Er3+ions in ZnWO4:Er crystal
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The spectra of absorption, excitation and emission of ZnWO4:Er crystal were measured and studied. There is an energy transfer process between Er3+ ion and the host lattice. Intensity parameters Ωλ of Er3+ in ZnWO4:Er crystal were calculated based on Judd-Ofelt theory. The oscillator strength, spontaneous radiative tranThe spectra of absorption, excitation and emission of ZnWO4:Er crystal were measured and studied. There is an energy transfer process between Er3+ ion and the host lattice. Intensity parameters Ωλ of Er3+ in ZnWO4:Er crystal were calculated based on Judd-Ofelt theory. The oscillator strength, spontaneous radiative transition rate, radiative lifetime, integrated emission cross section and branching ratio were calculated and discussed. The authors believe that the crystal has the potential usage as a lasing material..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 121 (1993)
Spectral properties of YAG:Er, Ce laser crystals
[in Chinese], [in Chinese], and [in Chinese]
We report in this paper the spectral properties of YAG double doped with Er3+(2 at %),Ce3+(0. 3 at %) (YAG:Er, Ce) laser crystals grown by Czocharalski technique. The absorption and emission spectra have been measured at room temperature. By using absorption spectra and Judd-Ofelt theory the experimental oscillator strWe report in this paper the spectral properties of YAG double doped with Er3+(2 at %),Ce3+(0. 3 at %) (YAG:Er, Ce) laser crystals grown by Czocharalski technique. The absorption and emission spectra have been measured at room temperature. By using absorption spectra and Judd-Ofelt theory the experimental oscillator strengths were calculated and discussed as well..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 2, 152 (1993)
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