Journals >Chinese Journal of Lasers
Contents
1993
Volume: 20 Issue 3
20 Article(s)
Export citation format
Research Article
Measurements of refractive index of lithium niobate integrated optical substrate
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The measurments of refractive index of lithium niobate integrated optical substrates were performed by means of prism coupling method on a precision goniometer with He-Ne laser. In the experiment, we used the differential technique and a liquid crystal optical rotator. The result shows that the acuracy is of 1×10-The measurments of refractive index of lithium niobate integrated optical substrates were performed by means of prism coupling method on a precision goniometer with He-Ne laser. In the experiment, we used the differential technique and a liquid crystal optical rotator. The result shows that the acuracy is of 1×10-4 and the reproducible deviations are less than 5×10-5..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 171 (1993)
Measuring focal length of a lens by identical direction Moire fringe
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper describes the measuring of focal length of a convex lens using Moire fringes in identical direction at a distance of 2f' from the lens, which is formed by interference fringe and a Ronchi grating. This method has high accuracy and the operating is simple.This paper describes the measuring of focal length of a convex lens using Moire fringes in identical direction at a distance of 2f' from the lens, which is formed by interference fringe and a Ronchi grating. This method has high accuracy and the operating is simple..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 175 (1993)
Interference measurement of dynamic thermal effect induced by optical pumping of YAG crystal rod
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The influence of dynamic thermal effect induced by optical pumping of YAG crystal rod in a pulsed solid laser on the wave front of the output laser beam is studied in this paper. A series of time-resolved instantaneous interferograms during and after the pumping are obtained with a Mach-Zehnder interferometer, and threThe influence of dynamic thermal effect induced by optical pumping of YAG crystal rod in a pulsed solid laser on the wave front of the output laser beam is studied in this paper. A series of time-resolved instantaneous interferograms during and after the pumping are obtained with a Mach-Zehnder interferometer, and three-dimensional time-resolved pictures of the distortion wave surfaces and the curve of thermal focal length of laser rod versus time are gained after the treatmant and calculation for interferograms, and the curve is explained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 179 (1993)
Experimental study of polarization diversity receiver for coherent optical fiber communication
[in Chinese], [in Chinese], and [in Chinese]
In this paper, a principle of polarization diversity receiver for coherent optical fiber communication is briefly discussed, and the polarization-insensitive receiver on basis of polarization diversity is achieved for the first time in China. Good demodulated signals independent on polarization are obtained at 137.2 MHIn this paper, a principle of polarization diversity receiver for coherent optical fiber communication is briefly discussed, and the polarization-insensitive receiver on basis of polarization diversity is achieved for the first time in China. Good demodulated signals independent on polarization are obtained at 137.2 MHz and 146.0 MHz of sinusoidal-wave. This method is being applied to a 140 MBit/s FSK coherent fiber communication system at 1.5 nm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 183 (1993)
A programmable pulse signal generator for controlling laser
[in Chinese], [in Chinese], and [in Chinese]
A programmable pulse signal generator is used for controlling laser frequency, pulse width and power, when the laser pulse is controled by a computer, it can generate a series of laser pulses.A programmable pulse signal generator is used for controlling laser frequency, pulse width and power, when the laser pulse is controled by a computer, it can generate a series of laser pulses..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 187 (1993)
Biomedical Photonics and Laser Medicine
Three-layered model Monte Carlo simulation of skin for laser Doppler blood flow measurement
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A three-layered model of Monte Carlo simulation for photon flux in skin was presented. From the results of simulation we know that by varying the distance between the inner edge of the ring detector and the beam, we can measured the blood flow at different depths. The dependence of detected photon number on the frequenA three-layered model of Monte Carlo simulation for photon flux in skin was presented. From the results of simulation we know that by varying the distance between the inner edge of the ring detector and the beam, we can measured the blood flow at different depths. The dependence of detected photon number on the frequency shift showed an exponetial decrease. By varying the blood volume fraction (Vb) , we investigated the effect of multiple scattering on the total frequency shift and the mean frequency shift. When Vb<0.01, the mean frequency shift was a constant and it reflected the mean velocity of red blood cells, while Vb>0.01, it reflected the root-mean-square velocity..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 215 (1993)
Effect of laser acupuncture on somatosensory evoked potentials
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 234 (1993)
Clinical application of laser channelizing peripheral arteries
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Using Nd:YAG laser and optical fiber with a metal tip, 8 patients' 10 totally occluded peripheral arteries have been successfully channelized without hemorrhage and perforation occurred. The laser energy was from 360 J to 2808 J, and the length of channelized segments was from 6 cm to 45 cm. 7 patients had follow-uUsing Nd:YAG laser and optical fiber with a metal tip, 8 patients' 10 totally occluded peripheral arteries have been successfully channelized without hemorrhage and perforation occurred. The laser energy was from 360 J to 2808 J, and the length of channelized segments was from 6 cm to 45 cm. 7 patients had follow-up examination with Doppler velocimetry at one year. All of them didn' t have recurrence of symptoms..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 237 (1993)
Holography and Information Processing
Slitless rainbow holography with one-dimensional diffuse screen
[in Chinese], and [in Chinese]
A new method of one-step slitless rainbow holography for 2-D transparency is proposed, in which a one-dimensional diffuse screen is employed in place of the real slit and random diffuse screen. The principle of this slitless rainbow holography is analyzed by means of Fourier optics. Rainbow holograms fabricated with a A new method of one-step slitless rainbow holography for 2-D transparency is proposed, in which a one-dimensional diffuse screen is employed in place of the real slit and random diffuse screen. The principle of this slitless rainbow holography is analyzed by means of Fourier optics. Rainbow holograms fabricated with a one-dimensional grating in a 4f -like processing system proves to be satisfactory..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 202 (1993)
Diffraction efficiency of volume hologramderived with the index of recording material different from that of the surrounding
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The general formula of the diffraction efficiency of volume holograms has been derived at the condition that the index of recording materials from that of the surroundings. It is found that this formula is more suitable compared with that of the Kogelnik's in practice.The general formula of the diffraction efficiency of volume holograms has been derived at the condition that the index of recording materials from that of the surroundings. It is found that this formula is more suitable compared with that of the Kogelnik's in practice..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 230 (1993)
Laser Manufacturing
Gettering effect of laser induced damage on a silicon wafer backside
[in Chinese], and [in Chinese]
The gettering experiment of laser irradiation damage on the back surface of a silicon wafer is presented. It is observed by a microscope that the defects induced by laser after high temperature annealing are thermally stable. It is examined that the oxidation induced stacking faults and the minority carrier lifetime arThe gettering experiment of laser irradiation damage on the back surface of a silicon wafer is presented. It is observed by a microscope that the defects induced by laser after high temperature annealing are thermally stable. It is examined that the oxidation induced stacking faults and the minority carrier lifetime are affected by laser damage gettering. The gettering effect is studied by neutron activation analysis..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 206 (1993)
Investigation of auto-feeding powder apparatus and technologyfor laser cladding
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An auto- feeding powder apparatus with good working stability and continuous adjustment of powder flow rate has been developed for laser cladding, in which the main power of the powder motion is gravity. The cladded coating is uniform and continuous. The utilization ratio of the alloy powders is as high as 94%.An auto- feeding powder apparatus with good working stability and continuous adjustment of powder flow rate has been developed for laser cladding, in which the main power of the powder motion is gravity. The cladded coating is uniform and continuous. The utilization ratio of the alloy powders is as high as 94%..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 210 (1993)
Laser Physics
Monolithic reactive ion etched groove-coupled-cavity AlGaAs/GaAs laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Monolithic groove-coupled-cavity AlGaAs/GaAs lasers were fabricated by using the technique of reactive ion etched of laser facets. CW stable single mode operation room temperature were observed. Typical single mode (FWHM) is about 0.23 nm mode suppression, 19 dB, mode space, 2.5 nm, and two-cavity threshold current of Monolithic groove-coupled-cavity AlGaAs/GaAs lasers were fabricated by using the technique of reactive ion etched of laser facets. CW stable single mode operation room temperature were observed. Typical single mode (FWHM) is about 0.23 nm mode suppression, 19 dB, mode space, 2.5 nm, and two-cavity threshold current of mode operation, 52 mA..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 161 (1993)
Experimental investigation of influence of CVL operating parameters on optimal delay of CVL oscillator-amplifier chain
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Influence of Ne pressure, input voltage, wall temperature and discharge tube atmosphere on optimal delay of the CVL oscillator- amplifier chain is studied. Experiments show that influence of laser operating parameters on the yellow light optimal delay is larger than that of green light. When laser operating parameters Influence of Ne pressure, input voltage, wall temperature and discharge tube atmosphere on optimal delay of the CVL oscillator- amplifier chain is studied. Experiments show that influence of laser operating parameters on the yellow light optimal delay is larger than that of green light. When laser operating parameters change, the optimal delay has larger variation relative to maximum amplification region (10 ns)..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 166 (1993)
Degenerate four-wave mixing in semiconductor doped glasses
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, degenerate four- wave mixing in borosilicate glasses doped with crystallites of the mixed semiconductor CdSxSe1-x is reported. When the experiments were performed with the light pulse at wavelength A=0.532 μm, pulse-durations tp=8 ns and tp=6 ps, these semiconductor-doped glasses exhibit third-order nonlIn this paper, degenerate four- wave mixing in borosilicate glasses doped with crystallites of the mixed semiconductor CdSxSe1-x is reported. When the experiments were performed with the light pulse at wavelength A=0.532 μm, pulse-durations tp=8 ns and tp=6 ps, these semiconductor-doped glasses exhibit third-order nonlinearities x(3) of -10-9～10-8esu and -10-11 esu for DFWM with 10 ns and 6 ps laser pulses, respectively. The experimentally measured decay time of the gratings is 30 ps, with a time resolution of 6 ps..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 190 (1993)
High efficiency organic nonlinear crystal MHBA and its second harmonic generation
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, phase-matched second harmonic generations in a novel organic material-MHBA have been obtained. The high conversion efficiency of 58. 94% for 1.06 μm→0.532 μm (Q-switched Nd:YAG laser), was firstly realized in organic crystal. Moreover, we have observed strong blue-violet light output, the tunable wavelenIn this paper, phase-matched second harmonic generations in a novel organic material-MHBA have been obtained. The high conversion efficiency of 58. 94% for 1.06 μm→0.532 μm (Q-switched Nd:YAG laser), was firstly realized in organic crystal. Moreover, we have observed strong blue-violet light output, the tunable wavelength of which was 400～450 nm. Conversion efficiency of about 6% for 0.83 μm→0.415 μm has been obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 194 (1993)
Electromagnetic and non-electromagnetic enhancement of SERS for solid/liquid systems
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In solid/liquid systems, the enhancement factors of electromagnetic and non-electromagnetic is intensively studied by measuring the characteristic peaks at 1004 cm-1 and 1010 cm-1 appearing in SERS spectra of pyridine on Ag surface. The concentration corresponding to the saturated adsorption of pyridine on Ag surface iIn solid/liquid systems, the enhancement factors of electromagnetic and non-electromagnetic is intensively studied by measuring the characteristic peaks at 1004 cm-1 and 1010 cm-1 appearing in SERS spectra of pyridine on Ag surface. The concentration corresponding to the saturated adsorption of pyridine on Ag surface is also discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 198 (1993)
Radio frequency discharge CO waveguide laser
[in Chinese], [in Chinese], and [in Chinese]
A RF excited CO slab waveguide laser is described. There are two ways to increase the laser output power. A maximum output of 120 watts with an efficiency of 17% has been achieved from a sealed 2 mm×20 mm×386 mm volume discharge at the electrode temperature down from 20 ℃ to -30 ℃.A RF excited CO slab waveguide laser is described. There are two ways to increase the laser output power. A maximum output of 120 watts with an efficiency of 17% has been achieved from a sealed 2 mm×20 mm×386 mm volume discharge at the electrode temperature down from 20 ℃ to -30 ℃..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 221 (1993)
Thermal regime in a coaxial CO2laser
[in Chinese]
A theoretical analysis is made of the characteristics of the thermal regime in a coaxial low-pressure CO2 laser and the output capability of the laser is compared with that of the conventional tubular lasers.A theoretical analysis is made of the characteristics of the thermal regime in a coaxial low-pressure CO2 laser and the output capability of the laser is compared with that of the conventional tubular lasers..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 224 (1993)
Expression of phase matched angle θm(λ) for MgO:LiNbO3crystal
[in Chinese], [in Chinese], and [in Chinese]
The expression of phase matched angle θm(λ) for MgO:LiNbO3 crystal has been obtained in this paper by using the least-square fitting method.The expression of phase matched angle θm(λ) for MgO:LiNbO3 crystal has been obtained in this paper by using the least-square fitting method..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 20, Issue 3, 228 (1993)
© Copyright 2018-2021 | Chinese Laser Press. All Rights Reserved 沪ICP备15018463号-20