Journals >Chinese Journal of Lasers
Contents
1991
Volume: 18 Issue 6
21 Article(s)
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Research Article
An automated phase measurement method for fringe pattern analysis
[in Chinese], and [in Chinese]
A novel discrete cosine transform (DCT) based automated phase measurement method is proposed and verified by a simulation and experiments.A novel discrete cosine transform (DCT) based automated phase measurement method is proposed and verified by a simulation and experiments..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 405 (1991)
Adaptive correction of laser intracavity tilt aberration
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A kind of high performance tilt mirror have been designed and made, and two kinds of correction system have been experimentally realized. One is "try and error" hill-climbing system controlled by micro-computer, the other is a dithering hill-climbing system. Experimental results show that both systems can corA kind of high performance tilt mirror have been designed and made, and two kinds of correction system have been experimentally realized. One is "try and error" hill-climbing system controlled by micro-computer, the other is a dithering hill-climbing system. Experimental results show that both systems can correct intracavity tilt aberration successfully. The merits of these two correction systems are compared with each other..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 409 (1991)
Measurement of lifetime of highly-excited atomic uranium levels
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
This paper reports on the technique and results for the measurement of lifetimes of highly-excited atomic uranium levels with the three-wavelength/three-step photoionizat ion process.This paper reports on the technique and results for the measurement of lifetimes of highly-excited atomic uranium levels with the three-wavelength/three-step photoionizat ion process..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 414 (1991)
Measurement of response time of ultrafast photoelectric detectorsand dispersive broadening effect of connectors with picosecondphotoconductive sampling technique
[in Chinese], [in Chinese], and [in Chinese]
Picosecond photoconduetive sampling system is constructed, which consists of a mode-locked dye laser synchronously pumped by a mode-locked argon ion laser and the photoconduetive switch using SOS as substrate, and the response time of ultra-high-speed photodiodes and the dispersive broadening effect of coaxial connectoPicosecond photoconduetive sampling system is constructed, which consists of a mode-locked dye laser synchronously pumped by a mode-locked argon ion laser and the photoconduetive switch using SOS as substrate, and the response time of ultra-high-speed photodiodes and the dispersive broadening effect of coaxial connectors have been measured..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 417 (1991)
Tuning sensitivity of birefringent filters
[in Chinese], [in Chinese], and [in Chinese]
A careful analysis about the angle between the optical surface and the optical axis of the crystal birefringent filters used in CW dye lasers tells us that when the angle is about 30-35°, the tuning sensitivity of the filter gets to its maximum.A careful analysis about the angle between the optical surface and the optical axis of the crystal birefringent filters used in CW dye lasers tells us that when the angle is about 30-35°, the tuning sensitivity of the filter gets to its maximum..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 421 (1991)
Atomic transition probability measurement in HCD
[in Chinese], [in Chinese], and [in Chinese]
Though the absorption method for measuring transition probability is an effective one, it is insensitive because of lower absorptivity. Here we introduce a new absorption method by using modulated HCD with higher sensitivity, and with this method we measured the relative transition probabilities of the six transitions Though the absorption method for measuring transition probability is an effective one, it is insensitive because of lower absorptivity. Here we introduce a new absorption method by using modulated HCD with higher sensitivity, and with this method we measured the relative transition probabilities of the six transitions from the ground state of uranium 238 to the excited states including the 16900 cm-1, 17361 cm-1 levels..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 477 (1991)
Biomedical Photonics and Laser Medicine
Studies on photodynamic inactivation of hypocrellin on cells in vitro and its absorption spectrum
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Cytotoxic effect of the new photosensitizer hypocerllin plus light exposure on PTK2 and heLa cells in vitro was studied by means of He-Ne laser microirradiation. The absorption spectrum and HPLC of hypocrellin were also investigated. It showed that hypocrellin might be an effective photosensitizer in photodynamic reactCytotoxic effect of the new photosensitizer hypocerllin plus light exposure on PTK2 and heLa cells in vitro was studied by means of He-Ne laser microirradiation. The absorption spectrum and HPLC of hypocrellin were also investigated. It showed that hypocrellin might be an effective photosensitizer in photodynamic reaction..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 471 (1991)
Holography and Information Processing
HOE to computed by directly solving coherent equation
[in Chinese], [in Chinese], and [in Chinese]
A new method to computetion of HOE by direct solving coherent equations is discussed in depth. The parameters of CGHOE can be obtained directly if the method is used in the computation.A new method to computetion of HOE by direct solving coherent equations is discussed in depth. The parameters of CGHOE can be obtained directly if the method is used in the computation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 450 (1991)
Holographic lens array and elliptical zone plate fabricated by deep UV lithography zone plate
[in Chinese], [in Chinese], and [in Chinese]
Holographic lens arrays and elliptical zone plates are fabricated on holographic plate and photoresist by using interference of the 1st order diffraction and the 2nd order diffraction beams from ion etching Fresnel zone plate obtained by electronic beam scanning and deep ultraviolet lithography techniques. The experimeHolographic lens arrays and elliptical zone plates are fabricated on holographic plate and photoresist by using interference of the 1st order diffraction and the 2nd order diffraction beams from ion etching Fresnel zone plate obtained by electronic beam scanning and deep ultraviolet lithography techniques. The experimental results of focusing and images produced are given..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 455 (1991)
Contrast control with optical phase conjugate feedback
[in Chinese], and [in Chinese]
A method is put forward for controling the contrast of optical images in real-time by using two phase conjugate mirrors. The theoretical analysis is made, an experi-mental scheme is proposed and the simulation results are given.A method is put forward for controling the contrast of optical images in real-time by using two phase conjugate mirrors. The theoretical analysis is made, an experi-mental scheme is proposed and the simulation results are given..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 458 (1991)
Optical m ulti-bit matrix multiplier
[in Chinese], [in Chinese], and [in Chinese]
A method of optical matrix multiplication using Modified Signed-Digit (MSD) arithmetic and multi-window decoding optical symbolic substitution rule is proposed and realized. It opereates at high speed and high accuracy, and multiplies experimentally two 22MSD matrix in 32 bits one second.A method of optical matrix multiplication using Modified Signed-Digit (MSD) arithmetic and multi-window decoding optical symbolic substitution rule is proposed and realized. It opereates at high speed and high accuracy, and multiplies experimentally two 22MSD matrix in 32 bits one second..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 462 (1991)
Laser Manufacturing
Property analysis for carbon-tungsten alloys laser cladding treatment on No. 60 steel surface
[in Chinese], and [in Chinese]
This article presents our experimental procedure of carbon-tungsten alloys cladding treatment on No. 60 steel surf ace by means of a high power CW CO2 laser. The experimental results indicate that a carbon-tunsten alloy cladding on a poor quality steel surface greatly improves its mechanical properties, the cladding thThis article presents our experimental procedure of carbon-tungsten alloys cladding treatment on No. 60 steel surf ace by means of a high power CW CO2 laser. The experimental results indicate that a carbon-tunsten alloy cladding on a poor quality steel surface greatly improves its mechanical properties, the cladding thickness are inversely propotional to the square of laser scanning speeds..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 466 (1991)
Laser Physics
Low threshold three-segmented composite cavity structure GaAlAs/GaAs single-mode laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A low threshold three-segmented composite cavity GaAlAs/GaAg laser is reported with a lowest CW threshold current of about 18 mA. It operates in stable single-mode, external differential quantum efficiency is 50-80% and the best linear relationship between light output and current remains up to 30 mW. Single frequency A low threshold three-segmented composite cavity GaAlAs/GaAg laser is reported with a lowest CW threshold current of about 18 mA. It operates in stable single-mode, external differential quantum efficiency is 50-80% and the best linear relationship between light output and current remains up to 30 mW. Single frequency oscillation locking is achieved over the temperature range of around 5°C and the highest temperature for CW lasing is 117 ℃..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 401 (1991)
Effects of pulse frequency modulation on three-step resonance laser ionization
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Through numerical solution of the Schrodinger equation we illustrate the effects of frequency modulation laser upon the excitation of a four-level system irradiated by simultaneous laser pulse. When the laser power is sufficiently great and the frequency modulation parameters are suitable, it shows that the frequency mThrough numerical solution of the Schrodinger equation we illustrate the effects of frequency modulation laser upon the excitation of a four-level system irradiated by simultaneous laser pulse. When the laser power is sufficiently great and the frequency modulation parameters are suitable, it shows that the frequency modulation excitation applied to a Gatlssin statistical distribution of detunings can obtain more effictive three-step photoionizatioa than monochromatic or amplitude modulation excitation does..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 423 (1991)
Enhencement of LPX radiation due to plasma convergence
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
According to principle of the angle of laser incidence relation to jet of laser-produced plasma, we designed a novel target which can make laser-produced plasma convergent. At the above condition, we found enhencement of LPX radiation. The experimental and the theoreticaly results show that enhencement phenomena are caAccording to principle of the angle of laser incidence relation to jet of laser-produced plasma, we designed a novel target which can make laser-produced plasma convergent. At the above condition, we found enhencement of LPX radiation. The experimental and the theoreticaly results show that enhencement phenomena are caused mainly by strong plasma convergence..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 429 (1991)
Target forms and ion emission characteristics
[in Chinese], [in Chinese], and [in Chinese]
Some new interesting experimetal results are reported about the characteristies of ion emission produced from targets with different sizes and forms by line-focused laser. Temporally resolved ion singnals have been diagnosed by Faraday charge collector. It was found that the anisotropic angular distribution of ion emisSome new interesting experimetal results are reported about the characteristies of ion emission produced from targets with different sizes and forms by line-focused laser. Temporally resolved ion singnals have been diagnosed by Faraday charge collector. It was found that the anisotropic angular distribution of ion emission under line-focused condition was weakened when laser irradiated the targets with cold pit..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 433 (1991)
Research on physical model of CPM
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A discussion is given on the major process of CPM that two pulses collide in the saturable absorber and presents a physical picture to describe this process, and a new brief and clear explanation is given to the physical machanism of CPM.A discussion is given on the major process of CPM that two pulses collide in the saturable absorber and presents a physical picture to describe this process, and a new brief and clear explanation is given to the physical machanism of CPM..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 437 (1991)
Effects of collisional broadening on stimulated Raman scattering in Ba vapour
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Studied here are eollisional broadenidg of Raman energy levels of atomic barium by buffer-gas molecules, its effects on the Raman gain coefficient and Eaman conversion effiency.Studied here are eollisional broadenidg of Raman energy levels of atomic barium by buffer-gas molecules, its effects on the Raman gain coefficient and Eaman conversion effiency..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 441 (1991)
Improvement of N2laser
[in Chinese], [in Chinese], and [in Chinese]
This paper reports a N2 laser filled with 95% N2 and 5% SF6. Using the intracavity structure the output pulse energy and power are increased by a factor of over 50%. Its output energy per pulse is up to 24.3mJ, pulse width >15ns, energy fluctuation 2.8%, efficiency 0.05%.This paper reports a N2 laser filled with 95% N2 and 5% SF6. Using the intracavity structure the output pulse energy and power are increased by a factor of over 50%. Its output energy per pulse is up to 24.3mJ, pulse width >15ns, energy fluctuation 2.8%, efficiency 0.05%..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 475 (1991)
Optogalvanic effect of neon with RF dischargie and its application in the measurement of high lying states
[in Chinese], [in Chinese], and [in Chinese]
We have made comprehensive investigations over the optogalvanic effect of neon with RF discharge, and revealed the general characters of the polarities and spatial behavior of the signal with the variation of discharge intensity. Qualitative explanations are given. We also measured the high lying states by detecting thWe have made comprehensive investigations over the optogalvanic effect of neon with RF discharge, and revealed the general characters of the polarities and spatial behavior of the signal with the variation of discharge intensity. Qualitative explanations are given. We also measured the high lying states by detecting the optogalvanic signal of two-step excitation of two pulsed dye laser, and recognized states as high as 46d' at the lowest discharge intensity. In addition, we observed the signal of two-photon transition of neon at 592.3 nm by focusing the single pulsed dye laser beam..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 479 (1991)
Materials and Thin Films
Luminescence properties of ZnWO4:Cr3+laser crystals
[in Chinese], [in Chinese], and [in Chinese]
Luminescence properties of Zn WO4:Cr3+ laser crystals were investigated. 4T2 energy level of Cr3+ splitted to three levels, 13550, 14205 and 14706cm-1, and the Stokes-shift of luminescence spectra is 236nm. The best intensity peak of emission is at 912nm. If the excitation wavelength was selected as 608nm and doping coLuminescence properties of Zn WO4:Cr3+ laser crystals were investigated. 4T2 energy level of Cr3+ splitted to three levels, 13550, 14205 and 14706cm-1, and the Stokes-shift of luminescence spectra is 236nm. The best intensity peak of emission is at 912nm. If the excitation wavelength was selected as 608nm and doping concentration was 0.01 wt%, a broad emission band would be observed at 532nm excitation..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 18, Issue 6, 446 (1991)
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