Journals >Chinese Journal of Lasers
Contents
1992
Volume: 19 Issue 9
18 Article(s)
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Research Article
Ultrafast optoelectronic switching in circular pulse generator
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel ultrafast electronic pulse generator system consisting of a voltage charged transmission line(VCTL) and an intrinsic silicon optoelectronic switch has baon successfully developed. The switch in the circular circuit is illuminated by a laser pulse at 1.06 micrometers wavelength and 80 picoseconds width. A nanoseA novel ultrafast electronic pulse generator system consisting of a voltage charged transmission line(VCTL) and an intrinsic silicon optoelectronic switch has baon successfully developed. The switch in the circular circuit is illuminated by a laser pulse at 1.06 micrometers wavelength and 80 picoseconds width. A nanosecond square-wave electronic pulse with an ultrafast risetime and falltime(less than 200 ps) and a width determined by the length of the transmission line and switching efficiency limited by the load has been obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 659 (1992)
Transferring image to GaAs in excimer laser induced aqueous etching
[in Chinese], [in Chinese], and [in Chinese]
This paper reports a technique combinaing the eseimer laser induced aqueoug etching and the photolithography to realize image transfer. In the system consisting of gold film, aqua and G-aAs, the gold film not only acts as photomask, but also gives an impulse to etching. Our results suggest that the system is an electroThis paper reports a technique combinaing the eseimer laser induced aqueoug etching and the photolithography to realize image transfer. In the system consisting of gold film, aqua and G-aAs, the gold film not only acts as photomask, but also gives an impulse to etching. Our results suggest that the system is an electro-chemical photocell..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 663 (1992)
Study on optical fiber displacement gauge using frequ-ency-modulated diode laser
[in Chinese], [in Chinese], and [in Chinese]
An optical fiber displacement gauge is a novel heterodyne interferometer. It ig-made with a frequency-modulated diode laser and an optical fiber. This gauge has an advantage of simple and practical construction. The measurement range of displacement is 1mm with an accuracy of 0.05 μm.An optical fiber displacement gauge is a novel heterodyne interferometer. It ig-made with a frequency-modulated diode laser and an optical fiber. This gauge has an advantage of simple and practical construction. The measurement range of displacement is 1mm with an accuracy of 0.05 μm..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 668 (1992)
A CuBr vapor laser used as brightness amplifier for projection microscopes
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An active projection microscope has been built with a CuBr vapor laser as its image brightness amplifier with linear amplification of more than 500 a resolving power is close to the objective's diffraction limit.An active projection microscope has been built with a CuBr vapor laser as its image brightness amplifier with linear amplification of more than 500 a resolving power is close to the objective's diffraction limit..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 712 (1992)
Experimental study of optical properties for a medium of 2-D source jet mixing flow
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The experimental studies of near field phase error, wave front interpretation with Zernike polynomials and far field Framihofer diffraction intogration for 2-D source jet mixing flow were conducted. The results would be useful for COIL.The experimental studies of near field phase error, wave front interpretation with Zernike polynomials and far field Framihofer diffraction intogration for 2-D source jet mixing flow were conducted. The results would be useful for COIL..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 715 (1992)
Holography and Information Processing
Optical logic operations using matrix liquid crystal modulators
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In Ibis paper, matrix liquid crystal modulators is produecd nsing matrix addressing technique, which can display images controlled fay IBM/XT computer. Using the mom-lators, a new optical logic operation unit is sot up, sixteen Boolean legic opemtion and optioai half adder are performed by the unit. This compact, pohuiIn Ibis paper, matrix liquid crystal modulators is produecd nsing matrix addressing technique, which can display images controlled fay IBM/XT computer. Using the mom-lators, a new optical logic operation unit is sot up, sixteen Boolean legic opemtion and optioai half adder are performed by the unit. This compact, pohuization oncoded optical login.it is a basis element to realize optical computing..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 706 (1992)
Laser Physics
Frequency doubling of tunable Ti:sapphire laser in β-BaB2O4
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The phase match angles of type I in BBOaie 36.0-21.2 for Ti:Al2O3 tuning range of 660-1200 nm. The UV output energy of SHG of a tunable Ti:A12O3 laser of above 1.4 mJ/pulse, conversion efficiency of 26.2% have been obtained. An analysis shows that higher output energy and conversion efficiency are possible and BBO is bThe phase match angles of type I in BBOaie 36.0-21.2 for Ti:Al2O3 tuning range of 660-1200 nm. The UV output energy of SHG of a tunable Ti:A12O3 laser of above 1.4 mJ/pulse, conversion efficiency of 26.2% have been obtained. An analysis shows that higher output energy and conversion efficiency are possible and BBO is better than KDP and LiIO2 for frequency doubling..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 641 (1992)
Output coupling of high power CO2lasers
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A theoretical analysis is given briefly on the coupling of output window for high power CO2 lasers. The experimental results of 5,10 kW lasers are discussed and a temperature control for optimal coupling is suggested.A theoretical analysis is given briefly on the coupling of output window for high power CO2 lasers. The experimental results of 5,10 kW lasers are discussed and a temperature control for optimal coupling is suggested..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 645 (1992)
Study on thermal characteristics of semiconductor laser phase-locked arrays with artificial diamond ibeatsink
[in Chinese], and [in Chinese]
In this paper, we de find the solution of thermal conduction equation in the heatsink consisting of artificial diamond and copper by mirror image method, and the effects different of artifical diamond thickness on the temperature rise of devices and the temperature difference between the strips are calculated.In this paper, we de find the solution of thermal conduction equation in the heatsink consisting of artificial diamond and copper by mirror image method, and the effects different of artifical diamond thickness on the temperature rise of devices and the temperature difference between the strips are calculated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 650 (1992)
Effects of facet reflectivity on characteristics of differentiation of diode laser output over Mas
[in Chinese], [in Chinese], and [in Chinese]
Investigations have been made on the effects of the facet on the laser characteristics of the diode output and its differentiation over the bias current theoretically and experimentally. Kestilts also show that approporiately adjusting the facet reflectivity may increase the diode output power and the external quantum Investigations have been made on the effects of the facet on the laser characteristics of the diode output and its differentiation over the bias current theoretically and experimentally. Kestilts also show that approporiately adjusting the facet reflectivity may increase the diode output power and the external quantum efficiency..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 654 (1992)
General interaction of two-photon Jaynes-Cummings model with squeezed vacuum
[in Chinese], and [in Chinese]
Considering the detuning and the initial atomic coherence,we study the squeezed field described as an SU(1, 1) coherent state interacting with the two-photon Jaynes-Cummings model and obtain a general expression of the field density operator, study the evolution of the mean photon number and the variance of the field qConsidering the detuning and the initial atomic coherence,we study the squeezed field described as an SU(1, 1) coherent state interacting with the two-photon Jaynes-Cummings model and obtain a general expression of the field density operator, study the evolution of the mean photon number and the variance of the field quadratures with particular regard to various conditions for squeezing..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 671 (1992)
Temperature gradient in thermo-optic bistable devices
[in Chinese]
On the basis of heat conductive theory, the longitudinal temperature distribution and its influence on the critical temperature rise in F-P cavity in which thermo-optical bistability can be formed were discussrd. Some matching conditions concerned with the absorption of sandwich materials and backward reflector in F-P On the basis of heat conductive theory, the longitudinal temperature distribution and its influence on the critical temperature rise in F-P cavity in which thermo-optical bistability can be formed were discussrd. Some matching conditions concerned with the absorption of sandwich materials and backward reflector in F-P cavity for decreasing or eliminating the longitudinal temperature gradient of intraeavity were proposed and discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 677 (1992)
Phase transition in operation of a semiconductor OBD
[in Chinese], [in Chinese], and [in Chinese]
In accordance with Landau's theory on phase transition, a theoretical analysis has been made for the nonequilibrium phase transition in the operation of a fibre-coupled semiconductor OBI) with feedback pumping. It is shown that the feedback paiameter is the transitional condition from the second-order phase transitIn accordance with Landau's theory on phase transition, a theoretical analysis has been made for the nonequilibrium phase transition in the operation of a fibre-coupled semiconductor OBI) with feedback pumping. It is shown that the feedback paiameter is the transitional condition from the second-order phase transition to the first-order phase transition. Parameters of three operation modes and signal amplification and processing have been reduced. respectively. The theory agrees with the author's experimental results..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 682 (1992)
Ionization rate coefficients for Li-like Si including contributions due to innerrghell lonization and excitation-autoionization
[in Chinese], [in Chinese], and [in Chinese]
The electron-impact ionization results for Li-like silicon including inner-shell ionization and exeitation-autoionization have been obtained by using Coulomb-Born-exchange approximation and Z-scaled hydrogenic model in which the definition and evaluation of the screening constant were improved.The electron-impact ionization results for Li-like silicon including inner-shell ionization and exeitation-autoionization have been obtained by using Coulomb-Born-exchange approximation and Z-scaled hydrogenic model in which the definition and evaluation of the screening constant were improved..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 687 (1992)
Influence of argon buffer gas on the Cs-ARF
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Cesium atomic resonr.ince filler (AEF) is one of the critical devices to realize the communication in ocean with blue-green laser. In this paper, the influence of argon buffer gas on the characteristics of the Cs-ARF is studied, and the response rate and the efficiency of Cs-ARF are obviously improved. The influence ofCesium atomic resonr.ince filler (AEF) is one of the critical devices to realize the communication in ocean with blue-green laser. In this paper, the influence of argon buffer gas on the characteristics of the Cs-ARF is studied, and the response rate and the efficiency of Cs-ARF are obviously improved. The influence of N2 and the device structure on the Cs-ARF is also studied..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 690 (1992)
Spectroscopic properties of Cr3+:LiNbO3crystals
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The absorption and fluorescence spectra of the Cr3+: LiNbO3 crystal was taken with a spectrophotometer and laser-indused fluorescence technique respectively. Following results were obtained: crystal field parameter Dq/B - 2.49, energy difference of 4T2 and -E states = 114cm-1, emission cross-section of 4T2-4A2 transitiThe absorption and fluorescence spectra of the Cr3+: LiNbO3 crystal was taken with a spectrophotometer and laser-indused fluorescence technique respectively. Following results were obtained: crystal field parameter Dq/B - 2.49, energy difference of 4T2 and -E states = 114cm-1, emission cross-section of 4T2-4A2 transition σe=6.58x10-20cm2; and fluorescence lifelime of 4T2-4A2 transition Tf=2μs. The energy level structure of Cr3+ in LiNbO3 crystals were also explined theoretically..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 694 (1992)
Observation of new violet fluorescent bands in lithium dimer
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper reports the experiments and analyses of two quasi-ioulinuous binds of Li2(21Σu+-X1Σg+) and (23Πg-x3Σu+) fluorescence in lithium vapor by UV narrow baud laser pumping.This paper reports the experiments and analyses of two quasi-ioulinuous binds of Li2(21Σu+-X1Σg+) and (23Πg-x3Σu+) fluorescence in lithium vapor by UV narrow baud laser pumping..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 698 (1992)
UV-laser induced cross-linking polymerization of PVK-CHI3system
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
UV-laser induced erogs-linking polymerization of PVK-NTC-CHI3 charsetra-nsfer complexes is first investigated at room temperature in the atmosphere. The UV-Vis spectra of components are observed. The threshold energy density and the resolution, that is 30.0 mJ cm-2 and 0.7 μm, for the orosslinking polymerization are deUV-laser induced erogs-linking polymerization of PVK-NTC-CHI3 charsetra-nsfer complexes is first investigated at room temperature in the atmosphere. The UV-Vis spectra of components are observed. The threshold energy density and the resolution, that is 30.0 mJ cm-2 and 0.7 μm, for the orosslinking polymerization are determined respectively, and the best grating pattern is obtained by using 355 nm laser radiation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 19, Issue 9, 701 (1992)
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