Journals >Chinese Journal of Lasers
Contents
1994
Volume: 21 Issue 4
16 Article(s)
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Research Article
Cs Atomic Resonance Filter Detected by Field Ionization
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new type Cs atomic resonance filter (ARF) datected by field ionization was reported. Theoretical analysis gives that the atomic inherent time response is of 1 ns, quantum efficiency is of 99% and line width is of 60 MHz. Preliminary measurement gives that the ARF's time response are of 130 ns, 120 ns and 120 ns; A new type Cs atomic resonance filter (ARF) datected by field ionization was reported. Theoretical analysis gives that the atomic inherent time response is of 1 ns, quantum efficiency is of 99% and line width is of 60 MHz. Preliminary measurement gives that the ARF's time response are of 130 ns, 120 ns and 120 ns; and critical signal laser energy is of 10 nJ for each pulse..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 257 (1994)
Real-time Measurement of 2-D Density Flux Distribution of Atomic Vapor in Vacuum Chamber by Laser Fluorescence
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A method and its relative apparatus of using laser fluorescence to measure the two dimensional density flux ditribution of the atomic vapor in vacuum chamber is introduced in this paper. The experiment shows: the distribution rule of two dimensional density flux in the vapor model of 4 mm× 6 mm is independent of tA method and its relative apparatus of using laser fluorescence to measure the two dimensional density flux ditribution of the atomic vapor in vacuum chamber is introduced in this paper. The experiment shows: the distribution rule of two dimensional density flux in the vapor model of 4 mm× 6 mm is independent of the heating power, and it can be described in the 6th power of cosine distribution, and the density flux varies linearly with the heating power approximately..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 261 (1994)
Test and Study of the Transient Photoconduction of α-CdSe Fast Photodetector
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The authors indicate the effect of deposition conditions on the microarea structure of an α-CdSe film, and investigate the transient photoconduction of an fast photodetector by means of α-CdSe as the photosensitive medium.The authors indicate the effect of deposition conditions on the microarea structure of an α-CdSe film, and investigate the transient photoconduction of an fast photodetector by means of α-CdSe as the photosensitive medium..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 266 (1994)
Measurement of Relaxition Rate Constants of NeI 2p1
[in Chinese], [in Chinese], and [in Chinese]
The influence of He, Ne, Ar, H2 on the intensity of 2p1→1s2 transition was studied by a single photon counting system. The relaxation rate constants of the NeI 2p1 by collision with He , Ne atoms and Penning reaction with Ar, H2 were obtained.The influence of He, Ne, Ar, H2 on the intensity of 2p1→1s2 transition was studied by a single photon counting system. The relaxation rate constants of the NeI 2p1 by collision with He , Ne atoms and Penning reaction with Ar, H2 were obtained..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 271 (1994)
Optical Fiber Directional Coupler with Continuously Variable Branching Ratio
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A detailed description of the effect of coupling area on the branching ratio of optical fiber directional coupler is given. The effect is calculated theoretically. The fiber directional couplers with continuously varible branching ratio have been fabricated.A detailed description of the effect of coupling area on the branching ratio of optical fiber directional coupler is given. The effect is calculated theoretically. The fiber directional couplers with continuously varible branching ratio have been fabricated..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 306 (1994)
Comparison of Strip Electrodes of Guidedwave Electrooptical Devices with Phase Reversal Structures
[in Chinese], and [in Chinese]
The modulation characteristics of guidedwave electrooptical devices with traveling wave phase reversal structures was analyzed. The performances of devices with two kinds of electrodes, asymmetric strip line electrode (ASL) and coplanar waveguide electrode (CPW)were compared. Numerical calculation shows that effective The modulation characteristics of guidedwave electrooptical devices with traveling wave phase reversal structures was analyzed. The performances of devices with two kinds of electrodes, asymmetric strip line electrode (ASL) and coplanar waveguide electrode (CPW)were compared. Numerical calculation shows that effective modulation of lightwave can be realized even through the ASL is applied to the phase reversal structures..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 311 (1994)
Holography and Information Processing
Speckle Motion Study and Its Measurement Application
[in Chinese]
A relation ship between the spatial speckles after a lens and the translational or rotatioal motion of a diffuse object before the lens was found. The novel method to measure multi-dimentional motion of body was presented.A relation ship between the spatial speckles after a lens and the translational or rotatioal motion of a diffuse object before the lens was found. The novel method to measure multi-dimentional motion of body was presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 288 (1994)
Investigation of Annular Aperture Cone Glass Shearing Laser Speckle Photography
[in Chinese], and [in Chinese]
In this paper, Annular aperture cone glass shearing laser speckle photography used for measuring the derivatives of displacements is proposed for the first time. The derivatives of displacements in all directions can be recorded simulataneously on one double exposed specklegram in one step , and the information of everIn this paper, Annular aperture cone glass shearing laser speckle photography used for measuring the derivatives of displacements is proposed for the first time. The derivatives of displacements in all directions can be recorded simulataneously on one double exposed specklegram in one step , and the information of every direction can be obtained by whole-field filtering..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 293 (1994)
Structure and optical storage properties of Phthalocyanine compound films
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Homogeneous thin films of phthalocyanine compound were prepared by vapor deposition method and were found to be writable with He-Ne laser beam on phthalocyanine (MPc) films. The threshold irradiation time for writing the recording spots was 250 ns with He-Ne laser of 7.8 mW power at the wavelength of 632.8 nm. This indHomogeneous thin films of phthalocyanine compound were prepared by vapor deposition method and were found to be writable with He-Ne laser beam on phthalocyanine (MPc) films. The threshold irradiation time for writing the recording spots was 250 ns with He-Ne laser of 7.8 mW power at the wavelength of 632.8 nm. This indicates that the reflectance of MPc films is about 20% and the absorptance are falls in 550 to 900 nm. The relationship between the structure and optical storage properties were discussed. The laser power and irradiation time increase as the in side chain phthalocyanine molecule increases..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 302 (1994)
Laser Manufacturing
Determination of Laser Processed Hardened Depth by IR Photothermal Radiometry
[in Chinese], [in Chinese], and [in Chinese]
A non-destructive remote technique for obtaining depth profile of laser processed metals by laser- induced IR photothermal radiometry is reported. Applications to the inspection of laser processed Zr-2. 5Nb alloy samples are presented. Depth profiles obtained from this method are consistent with the profiles obtained fA non-destructive remote technique for obtaining depth profile of laser processed metals by laser- induced IR photothermal radiometry is reported. Applications to the inspection of laser processed Zr-2. 5Nb alloy samples are presented. Depth profiles obtained from this method are consistent with the profiles obtained from destructive methods such as microhardness testing..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 316 (1994)
Laser Physics
Investigation of the Evolution of the Beam Divergence of Output Pulse from Injection Locking Copper Vapor Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, a method of time-resolved divergence measurement using an aperture is reported. With this method, we measured the evolution of the beam divergence of output pulse from an injection locking copper vaper laser (CVL) of magnification M=10 (M=30 for oscillator). The experimental results show that the beam diIn this paper, a method of time-resolved divergence measurement using an aperture is reported. With this method, we measured the evolution of the beam divergence of output pulse from an injection locking copper vaper laser (CVL) of magnification M=10 (M=30 for oscillator). The experimental results show that the beam divergence becomes smaller and smaller reducing from 1.0 mrad to 0.12 mrad. The experimental results are analysed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 243 (1994)
Measurement of Light Output Noise of Semiconductor Lasers and Its Correlation with Electrical Noise
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
In this paper, the experimental set-up used for measuring the light output noise of a laser diode has been established. A weak electrical noise and light output noise can be measured by using the cross-spectrum approach. Experimental results obtained for 30 Vgroove InP/InGaAsP lasers at frequency region from 1 Hz to 10In this paper, the experimental set-up used for measuring the light output noise of a laser diode has been established. A weak electrical noise and light output noise can be measured by using the cross-spectrum approach. Experimental results obtained for 30 Vgroove InP/InGaAsP lasers at frequency region from 1 Hz to 100 kHz demonstrated that the light output noise and electrical noise is correlative in the superradiation region, and its spectrum form is also similar. According to the mechanism of light excitation in LD, the light output noise has been discussed. The theoritical analysis shows that the light output noise is separated into two parts, one caused by carriers fluctuation is full correlative with electrical noise, another caused by light quantum fluctuation is uncorrelative with electrical noise..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 248 (1994)
Study of the Dual Oscillation of XeBr and XeCl Laser
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A bi-wavelength laser oscillation at 282 nm and 308 nm in a mixture of HCl/HBr/Xe/Ne is reported. The process of the dual oscillation have been analyzied. A investigation is also made about the density influence on HCl on the energy and lifetime of XeBr laseras well as HBr on XeCl laser's.A bi-wavelength laser oscillation at 282 nm and 308 nm in a mixture of HCl/HBr/Xe/Ne is reported. The process of the dual oscillation have been analyzied. A investigation is also made about the density influence on HCl on the energy and lifetime of XeBr laseras well as HBr on XeCl laser's..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 253 (1994)
Research on the Characteristics of Raman Amplification with an angular pump beam
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By introducing the concept of intensity-averaging, the mechamism of high power Raman amplification with an angular pump beam is analyzed. The analyzed results show that an angular pump beam is more efficient than collinear propogation for the pump intensity-averaging and the pump energy extracting by a short pulse seedBy introducing the concept of intensity-averaging, the mechamism of high power Raman amplification with an angular pump beam is analyzed. The analyzed results show that an angular pump beam is more efficient than collinear propogation for the pump intensity-averaging and the pump energy extracting by a short pulse seed beam. The experimental results on parameters of the pressure and the angle between pump and seed beams are then presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 274 (1994)
Laser Deceleration of an Atomic Beam by Red Shifted Diffuse Light
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A new deceleration and cooling mechanism by red shifted diffuse light have been reported. The expression of radiation pressures produced by monochromatic red shifted diffuse light are obtained by solving the two-level atom model and deceleration of Na atoms in an atomic beam have been observed in experiment.A new deceleration and cooling mechanism by red shifted diffuse light have been reported. The expression of radiation pressures produced by monochromatic red shifted diffuse light are obtained by solving the two-level atom model and deceleration of Na atoms in an atomic beam have been observed in experiment..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 280 (1994)
Extracavity Modulation of a Single-frequency dye laser and Its Application in Spectral Measurement
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 21, Issue 4, 284 (1994)
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