Journals >Chinese Journal of Lasers
Contents
1996
Volume: 23 Issue 11
21 Article(s)
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Research Article
Specific Portable CW YAG Laser Power Supply with a SuperimposingSupply Adjusted by Cascaded Transistors
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel Power supply with a superimposed Power supply adjusted by cascadetransistors is developed and specifically used for CW YAG lasers pumped by double Kr lamps Specifically.Benefiting from the characteristic of the operating voltage of the Kr lamas; wecan adjust this power supply by using a superim small Power suppA novel Power supply with a superimposed Power supply adjusted by cascadetransistors is developed and specifically used for CW YAG lasers pumped by double Kr lamps Specifically.Benefiting from the characteristic of the operating voltage of the Kr lamas; wecan adjust this power supply by using a superim small Power supply which is atransistor current stabilized source.This Power supply ases the same stability as theconventional one while deserting the clumbersome high Power voltage transformer..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 971 (1996)
Study of Coupling of Multiple Diode Laser with Self-focusing Lenses
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel technique for couplinS multiple diode laser is demonstrated with selffocusing lenses.A coupling efficiency of about 60% was obtained. Some figures indicatethe deviation of SFL will induce the foCal POint size of the coupling beam and Provide thePrecision required for the solid state optical system. Such a schemA novel technique for couplinS multiple diode laser is demonstrated with selffocusing lenses.A coupling efficiency of about 60% was obtained. Some figures indicatethe deviation of SFL will induce the foCal POint size of the coupling beam and Provide thePrecision required for the solid state optical system. Such a scheme may be Wticularlyuseful for more application of diode lasers to come..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 975 (1996)
LFM Pulse Compression of a CO2Laser
[in Chinese], and [in Chinese]
This peper describes a linear FM of a CO2 laser with an acoustooptic modulator.The chirp Signal is detected with an optical autodyne and comprehend with a SAW dispersivedelay line. The compressed pulse width is 80 us and its comptession ratio is 100. Theexperimental system and results are also analysed and discussed.This peper describes a linear FM of a CO2 laser with an acoustooptic modulator.The chirp Signal is detected with an optical autodyne and comprehend with a SAW dispersivedelay line. The compressed pulse width is 80 us and its comptession ratio is 100. Theexperimental system and results are also analysed and discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 981 (1996)
A Method for Measuring Ultra-low Loss of an Optical Cavity
[in Chinese]
This Paper introduces a method for measurinS a cavity toeal ion by measuring theintensity decay time of an optical cavity, and the resolution allows the measurement of up to ～10 -6 of ultra-low loss.This Paper introduces a method for measurinS a cavity toeal ion by measuring theintensity decay time of an optical cavity, and the resolution allows the measurement of up to ～10 -6 of ultra-low loss..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 986 (1996)
Reactive Sputtering TiO2Films
[in Chinese], and [in Chinese]
This paper reports the reactive sputtering TiO2 films. The experimental resultsindicated that the properties of the TiO2 films such as the deposition rate;transmittance, conductivity and absorption coefficient depend on the flow of the reactive gas and sputteringPOwer. By controlling the flow of the O2 gas; we have proThis paper reports the reactive sputtering TiO2 films. The experimental resultsindicated that the properties of the TiO2 films such as the deposition rate;transmittance, conductivity and absorption coefficient depend on the flow of the reactive gas and sputteringPOwer. By controlling the flow of the O2 gas; we have produced TiO2 films characteristic of good conductivity and certain absorption..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 991 (1996)
Research on Blumlein Microstrip Photoconductor Switching with High-efficiency
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A Blumlein microstrip photoconductor switch (P.S.)of high-efficiency isdescribed for the first time in this paper. The output characteristics of the P.S.circuit andthe working properties of the P.S. driven by various laser powers are discussed in theory. Theorical analysis shows that the P.S. has 100% voltage transmissA Blumlein microstrip photoconductor switch (P.S.)of high-efficiency isdescribed for the first time in this paper. The output characteristics of the P.S.circuit andthe working properties of the P.S. driven by various laser powers are discussed in theory. Theorical analysis shows that the P.S. has 100% voltage transmission efficiency. Voltagetransmission efficiency of 93% has been obtained in experiment that in agreement with theresult of theory..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 995 (1996)
Design of Three-dimensional Object Rotation Distortion-invariant Optical Correlation Filters
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper;we have studied the design theory of three-dimensional objectrotation distortion-invariant optical correlation filters.The parameters of the filters havebeen computed and coded. Computer simulation of optical currelation recognition has beencarried out.In this paper;we have studied the design theory of three-dimensional objectrotation distortion-invariant optical correlation filters.The parameters of the filters havebeen computed and coded. Computer simulation of optical currelation recognition has beencarried out..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1001 (1996)
Biomedical Photonics and Laser Medicine
Semiconductor Laser Repairs of the Facial Nerve:an Experimental Study in the Guinea Pig ENT Department
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Thirty six guinea pigs underwent resection of the right facial nerve in the Patotidfossa. For twelve of them;the semiconductor laser with 500 mW output POwer was used toanaStomose the facial nerve. We observed the lantency of evoked compound muscle actionPOtentials (CMAP) and morphology of the repaired facial nerve preThirty six guinea pigs underwent resection of the right facial nerve in the Patotidfossa. For twelve of them;the semiconductor laser with 500 mW output POwer was used toanaStomose the facial nerve. We observed the lantency of evoked compound muscle actionPOtentials (CMAP) and morphology of the repaired facial nerve preoperatively in 4, 6 and 8 weeks postoperatively and compared with the other animalSI facial nerves which wereanaStomosed with conventional monofilament and multifilarnent suture. We found the laser-using method of anastomasis was better than that of anastomasis used with conventional multifilament but had neither beneficial nor detrimental effects than that of monofilament. It is concluded that using semiconductor laser to repair facial nerve may be efficient..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1035 (1996)
Laser Physics
Study of a High-efficiency High-repetition-rate Frequency DoubledQ-switched Nd:YAG Laser Pumped Ti:sapphire Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A Ti:sapphire laser pumped by a frequency doubled Q-switched Nd: YAG laseris studied theoretically and experimently. In experiment when pumpinS POwer is 6. 8 W andwith a repetition-rate of 5 kHz; an output Power of 2.185 W is obtained with a stable slopeefficiency 30%.A Ti:sapphire laser pumped by a frequency doubled Q-switched Nd: YAG laseris studied theoretically and experimently. In experiment when pumpinS POwer is 6. 8 W andwith a repetition-rate of 5 kHz; an output Power of 2.185 W is obtained with a stable slopeefficiency 30%..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 961 (1996)
All Solid-state Passively Mode-locked Ti:sapphire/CdSxSe1-xLaser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By using a semiconductor Cd-doped glass CdSxSe1-x instead of dye DDI and HITCIas a saturable absorber;we have realized the stable operation of an all solid-state passivelymode-locked Ti:sapphire laser. The mode-locked output POwer of 150 mW and pulse widthof 14 ps have been obtained with a 5.5 W Ar+ laser pumping PowerBy using a semiconductor Cd-doped glass CdSxSe1-x instead of dye DDI and HITCIas a saturable absorber;we have realized the stable operation of an all solid-state passivelymode-locked Ti:sapphire laser. The mode-locked output POwer of 150 mW and pulse widthof 14 ps have been obtained with a 5.5 W Ar+ laser pumping Power..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 966 (1996)
Quasi-continuous Wave Tunable Ti:sapphire Laser
[in Chinese], [in Chinese], and [in Chinese]
A novel and stable Ti:sapphire laser is reported.It has features, such as singlemede output, narrow bandwidth, wide wavelength range;continuously tunable; highpumping efficiency and so on.A novel and stable Ti:sapphire laser is reported.It has features, such as singlemede output, narrow bandwidth, wide wavelength range;continuously tunable; highpumping efficiency and so on..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 969 (1996)
Lasing without inversion induced by Raman Process in a V-type Three-level System
[in Chinese], and [in Chinese]
In this paper; a closed V-type three-level system is studied. In the system;atomic coherence is induced by a Raman process of coupling the two upper levels; and lasingoccurs at the transition between either of the upper levels and the ]ower level. It is shownthat this system can exhibit lasing without inversion in the In this paper; a closed V-type three-level system is studied. In the system;atomic coherence is induced by a Raman process of coupling the two upper levels; and lasingoccurs at the transition between either of the upper levels and the ]ower level. It is shownthat this system can exhibit lasing without inversion in the bare state, and the gain arisesfrom the atomic coherence in the dressed state..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1006 (1996)
Experimental Research on SiO2Cluster Generation from Doped Silica Aerogel by Laser Ablation
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The cluster generation characteristics of some doped silica aerogels wereinvestigated under laser ablation in the negative ion channel by the time-of-flight massspectrometry. Several silica cluster sequences have been formed from the carbon and Rh6Gcoated silica aerosol samples; but no clusters formed from the doP3ntS The cluster generation characteristics of some doped silica aerogels wereinvestigated under laser ablation in the negative ion channel by the time-of-flight massspectrometry. Several silica cluster sequences have been formed from the carbon and Rh6Gcoated silica aerosol samples; but no clusters formed from the doP3ntS could be detected. Incontrast; for fullerene-doped silica aerogel only information from fullerene dopant wasobtained; no silica clusters were detected. The structures of the doped silica aerogels play key roles in the laser energy transfer and cluster formation processes..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1011 (1996)
Electron Beam Excitation of Cesium Fluoride Ionic Excimer
[in Chinese]
The vacuum ultraviolet (VUV) fluorescence from an ionic alkali-halide excimerwas observed by electron beam excitation. A gas mixture of helium or neon with a hot vaporof CsF was excited to obtain two diffuse emission bands centered at 185 and 152 nm from Cs2+F-, which is isoelectronic to XeF excimer.The vacuum ultraviolet (VUV) fluorescence from an ionic alkali-halide excimerwas observed by electron beam excitation. A gas mixture of helium or neon with a hot vaporof CsF was excited to obtain two diffuse emission bands centered at 185 and 152 nm from Cs2+F-, which is isoelectronic to XeF excimer..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1016 (1996)
Quantatitive Description of Beam Quality in Uniform Illumination Experiments
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
We present a simple model to treat the transverse electron thermal conductivityand its influnce on the homogeneity of the high power laser beam used in uniformillumination experiments. Furthmore, the diameters such as the beam width, the intensityinhomogeneity and the energy utilization ratio are redefined to give a quWe present a simple model to treat the transverse electron thermal conductivityand its influnce on the homogeneity of the high power laser beam used in uniformillumination experiments. Furthmore, the diameters such as the beam width, the intensityinhomogeneity and the energy utilization ratio are redefined to give a quantutitive measure ofthe beam quality..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1021 (1996)
Analysis of Up-conversion Luminescence of ErLaP5O14Noncrystalline
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The up- conversion fluorescence phenomenon of Er0.1La0.9P5O14 noncrystallinepumped by a pulsed dye laser is studied. The peaks of the up-conversion fluorescence are(552.2, 545.7, 542.9) nm, 525.0 nm, 468.8 nm, 452.2 nm, (411.2, 407.0) nm, 384.1 nm and 380.7 nm. The luminescence(552.2, 545.7, 542.9) nm, 525.0 nm, (411.2The up- conversion fluorescence phenomenon of Er0.1La0.9P5O14 noncrystallinepumped by a pulsed dye laser is studied. The peaks of the up-conversion fluorescence are(552.2, 545.7, 542.9) nm, 525.0 nm, 468.8 nm, 452.2 nm, (411.2, 407.0) nm, 384.1 nm and 380.7 nm. The luminescence(552.2, 545.7, 542.9) nm, 525.0 nm, (411.2 nm, 407.0) nm and 384.1 nm can be ascribed to resonant step by step absorption oftwo phtons by a single ion and 468.8, 452.2 and 380.7 nm are generated in three-photonprocesses..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1027 (1996)
Theoretical Study on Nonlinear Optical Properties of the Substituted Cinnamonaldehyde Derivatives
[in Chinese], [in Chinese], and [in Chinese]
The second-order nonlinear optical polarizabilities of a series of substitutedcinnamonaldehyde derivatives using the CNDO/S-CI method and Perturbation theory wereCalculated and the structure dependence of their nonlinear optical properties was studied. TheresultS reveal that this kind of compounds have fairly large secThe second-order nonlinear optical polarizabilities of a series of substitutedcinnamonaldehyde derivatives using the CNDO/S-CI method and Perturbation theory wereCalculated and the structure dependence of their nonlinear optical properties was studied. TheresultS reveal that this kind of compounds have fairly large second-order POlarizabilities.Morever, there is close relation between the best structures and the high values of β. So weconsider that this series of compounds are worthy of being studied further..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1031 (1996)
Materials and Thin Films
The Spectroscopic and Upconversion Luminous Properties of Er3+:doped Fluoride Glass
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The spectroscopic and luminous properties of Er3+ ions in ZBLAN fluoride glass invisible region were studied as a function of chlorine content. The results show that theanions have much more effect on the luminous properties. The upconversion luminescence invisible region in bluk glass and fibre was measured using a 80The spectroscopic and luminous properties of Er3+ ions in ZBLAN fluoride glass invisible region were studied as a function of chlorine content. The results show that theanions have much more effect on the luminous properties. The upconversion luminescence invisible region in bluk glass and fibre was measured using a 800 nm Ti:sapphire laser as theexcitation source. A strong upconversion luminous band at 550 nm for 4S3/2-4I15/2 transition was observed in all samples. The effect of various parameters on the upeonversion luminescence was studied..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1039 (1996)
Dependance of Spectral Properties of Yb3+on [PO3]--Content in Fluorophosphate Glasses
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The spectral Properties of Yb3+ are investigated in fluorophosphate gi￣ withdifferent [PO3]- contentS. In fluorophosphate glasses the results indicate that as the [PO;]content increases in glasses; the stimulated emission cross section of Yb3+ increases; and theabsorption and emission Peaks shift to longer wavelengths;The spectral Properties of Yb3+ are investigated in fluorophosphate gi￣ withdifferent [PO3]- contentS. In fluorophosphate glasses the results indicate that as the [PO;]content increases in glasses; the stimulated emission cross section of Yb3+ increases; and theabsorption and emission Peaks shift to longer wavelengths;showing the Nephelauxeticeffect.Also; with the increase of [PO3]- content in the glass;more OH- exists in theglass;exertS strong influence on the fluorescence lifetime of Yb3+..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1043 (1996)
Investigation on Relationship between Platinum Inclusion Density and Platinum Redox Equilibrium in Phosphate Laser Glass
[in Chinese], [in Chinese], and [in Chinese]
With absorptance spectra of platinum ions; relationship between platinuminclusion density and platinum redox equilibrium in R2O-BaO-P2O5 system phosphate laserglass was investigated. The results show that platinum inclusion density reduces as theequilibrium shifts towards right.With the melting temperature or OZ perilaWith absorptance spectra of platinum ions; relationship between platinuminclusion density and platinum redox equilibrium in R2O-BaO-P2O5 system phosphate laserglass was investigated. The results show that platinum inclusion density reduces as theequilibrium shifts towards right.With the melting temperature or OZ perilalpressure of melting atmosphere increased, the equilibrium shifts towardsright. When is large enough, platinum inclusions can not be formed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1047 (1996)
A Novel IR Switching and Mode-locking Dye
[in Chinese], and [in Chinese]
A novel infrared laser dye absorbing 1455 nm was synthesized.The properties ofswitching and mode-locking for different lasers were investigated. A Q-switched 1064 urnlaser with a polysulfone film works satisfactorily. The pulse width is 10 ns. The dyesolutions in DMSO, Iodoethane, 1, 2-Dichloroethylene show excellent pA novel infrared laser dye absorbing 1455 nm was synthesized.The properties ofswitching and mode-locking for different lasers were investigated. A Q-switched 1064 urnlaser with a polysulfone film works satisfactorily. The pulse width is 10 ns. The dyesolutions in DMSO, Iodoethane, 1, 2-Dichloroethylene show excellent properties in modelocking 1340 nm lasers. The pulse widths are 90～100 ps..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 23, Issue 11, 1053 (1996)
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