Journals >Chinese Journal of Lasers
Contents
1995
Volume: 22 Issue 8
17 Article(s)
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Research Article
Speckle Photography for Measuring the 3-D Asymmetric Temperature Field
[in Chinese], [in Chinese], and [in Chinese]
A method of magnifying the deflective angle of a light beam is proposed, in which the measurement sensitivity of speckle photography can be raised. By speckle Photography, a 3-D asymmetrric temperature field for the phase object is measured. And the temperature distribution for a giving layer (z=const) is obtained by cA method of magnifying the deflective angle of a light beam is proposed, in which the measurement sensitivity of speckle photography can be raised. By speckle Photography, a 3-D asymmetrric temperature field for the phase object is measured. And the temperature distribution for a giving layer (z=const) is obtained by convolution backprojection algorithm. The experiment shows that this method is suitable for the measurement of the phase object with the small sectional size and the small temperature gradient..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 579 (1995)
Qualitative Comparison of Exposure Characteristics of Soft X-ray Film SIOFM-5FW With Kodak 101-05 and Ilford-Q Plates
[in Chinese], [in Chinese], and [in Chinese]
Under identical exposure and Processing conditions, the exposure characteristics of the soft X-ray film SIOFM-5FW have been compared qualitatively with Kodak 101- 05and Ilford-Q plates in the soft x-ray and XUV ranges below 100. 0 nM, using D-19 and Phenisol developers. The experimental results have shown that for the Under identical exposure and Processing conditions, the exposure characteristics of the soft X-ray film SIOFM-5FW have been compared qualitatively with Kodak 101- 05and Ilford-Q plates in the soft x-ray and XUV ranges below 100. 0 nM, using D-19 and Phenisol developers. The experimental results have shown that for the radiation above 10. 0nm, the response of SIOFM-5FW lies between Kodak101-05 and Ilford-Q plate,but closely to the former and for the radiation below 10. 0 nm SIOFM-5FW is more sensitive than Kodak 101-05 plate, with a higher saturation density and dynamic range, and has an obvious K absorption eadge structure of carbon. The effects of the two developers on the exposure characteristics are discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 584 (1995)
A Digital Speckle Method for the Display of Motion Paths
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A digital speckle multi-exposure Photographic technique has been Proposed instead of the traditional technique of using photographic plates for the display of motion baths. The Principle of the proposed method has been described in detail in terms of the Young's fringe model. Two experimental results for the lateraA digital speckle multi-exposure Photographic technique has been Proposed instead of the traditional technique of using photographic plates for the display of motion baths. The Principle of the proposed method has been described in detail in terms of the Young's fringe model. Two experimental results for the lateral motion and the tilt of the measured are been plasented. The factors which affect the measuring results are analysed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 589 (1995)
Dependence of the Received Light Power of a Laser Triangulation Displacement Sensor on the Testing Surface Inclination and the Inclination Angle Measurement
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The testing surface inclination will result in the large measuring error in the displacement measurement using commercial laser triangulation sensors. In this paper,according to the theory of light scattering from rough surfaces, the relationship between the received light power of the laser triangulation sensor and thThe testing surface inclination will result in the large measuring error in the displacement measurement using commercial laser triangulation sensors. In this paper,according to the theory of light scattering from rough surfaces, the relationship between the received light power of the laser triangulation sensor and the testing surface inclination is discussed in detail. A method which can be used to measure the inclination angle and the displacement of the testing surface at the same time is given. Depending on the measurement of the inclination angle the measuring error of the displacement can be corrected or minimized. A computer simulation and experimental results are presented..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 595 (1995)
Holography and Information Processing
Research of the Time-averaged Image Plane Holographic Interferometry and Its Application
[in Chinese]
Based on the micro-amplitude, time-averaged image plane holographic interferometric measurement the purpose of this paper is to illustrate with examples of simple harmonic vibrational two-dimensional diffusi0on from an object the applied value of the mothed.Based on the micro-amplitude, time-averaged image plane holographic interferometric measurement the purpose of this paper is to illustrate with examples of simple harmonic vibrational two-dimensional diffusi0on from an object the applied value of the mothed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 614 (1995)
The Effecfs of the Unsymmetry of Data Channels on the Restraint of Noises in Magneto-optical Storage Systems
[in Chinese], [in Chinese], and [in Chinese]
An analysis is done of the effects of the unsymmetrical structure in differential data channels on noise characteristics for magneto-optical data storage systems. It is found that the capability of differential channels to eliminate common-mode noise is dependent on the match degree of channel parameters. It is also foAn analysis is done of the effects of the unsymmetrical structure in differential data channels on noise characteristics for magneto-optical data storage systems. It is found that the capability of differential channels to eliminate common-mode noise is dependent on the match degree of channel parameters. It is also found that the unsymmetrical structure in channels results in the different noise intensities, when the data of "1" and "0" read out..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 619 (1995)
A Morphological Processor Module by Building Blocks
[in Chinese], [in Chinese], and [in Chinese]
A novel polarization-optical integration technique is proposed to assemble the module-packaging of the beam array generator, morphological processor, and PROM device by the stacking of building blocks. It is shown that the technique is simple and compact in construction, easy to align, capable for high data density andA novel polarization-optical integration technique is proposed to assemble the module-packaging of the beam array generator, morphological processor, and PROM device by the stacking of building blocks. It is shown that the technique is simple and compact in construction, easy to align, capable for high data density and insensitive to environment..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 623 (1995)
Optimal Design of 1480 nm/1550 nm Wavelength Division Multiplexers for Use in Erbium-Doped Fiber Amplifers
[in Chinese], and [in Chinese]
In this paper, bated on the theory of composited waveguides, the relations between the shape of the crabs-secton of coupling region and polarization sensitivity in wavelength division-multiplexers (WDMs) are analyzed. Then we highlightly compared polarization characteristics of the rectangular cross-section of WDM withIn this paper, bated on the theory of composited waveguides, the relations between the shape of the crabs-secton of coupling region and polarization sensitivity in wavelength division-multiplexers (WDMs) are analyzed. Then we highlightly compared polarization characteristics of the rectangular cross-section of WDM with those of the elliptical cross-section of WDM, and found that when the ratio of the principal axis to minor axis of ellipse equals 1. 88 the WDMs are insensitive to polarization. The fabricated WDM operating at wavelengths 1480/1550 nm exhibits an isolation above 20 dB, polarization sensitivity of less than 0.1 dB, and excess loss of less than 0.5 dB..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 627 (1995)
Laser Manufacturing
Cubic Boron Nitride Thin Films Prepared by Pulsed ArF Excimer Laser Deposition
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Boron nitride thin films have been prepaied on the (100) surface of silicon substrate by the pulsed ArF excimer laser deposition (PLD) method. The structure and composition of the films have been measured by XRD, FTIR and AES, respectively. The results show that the films are cubic boron nitride (c BN) including small Boron nitride thin films have been prepaied on the (100) surface of silicon substrate by the pulsed ArF excimer laser deposition (PLD) method. The structure and composition of the films have been measured by XRD, FTIR and AES, respectively. The results show that the films are cubic boron nitride (c BN) including small amount of hexagonal boron nitride (h BN). The highest value of Vickers microhardness of the films is about 1580 kg/mm2..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 367 (1995)
Laser Cladding of High Temperature Alloys and Their Application
[in Chinese], and [in Chinese]
Failure of the high temperature tools includes mainly hot-wearing, oxidizing and hot-fatigue. According to this character, Ni-based high temperature alloy + WC and MCrAlY alloy (M=Ni, Co) + WC are coated on the steel substrate by laser cladding. The observation of microstructure and mechanical perfomance of the claddinFailure of the high temperature tools includes mainly hot-wearing, oxidizing and hot-fatigue. According to this character, Ni-based high temperature alloy + WC and MCrAlY alloy (M=Ni, Co) + WC are coated on the steel substrate by laser cladding. The observation of microstructure and mechanical perfomance of the claddings have been carried out. The results show that the coatings of Ni-based high temperature alloy + WC have a higher hot strength-hardness than that of MCrAlY alloy + WC, but the latter has better oxidation resistance than that of Ni-based igh temperature alloy +WC. The above two classes of coatings are applied to the seamless tube plugs, as a result, the service life of the plugs has been improved by 1~4 times. Among the coatings, the MCrAlY alloy +10% WC is the best..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 632 (1995)
Laser Physics
A Laser Diode Pumped Nd:MgO:LiNbO3Single Crystal Fiber Extracavity Frequency Doubled Laser
[in Chinese], [in Chinese], and [in Chinese]
A core-cladding waveguide structure of the a-axis, Nd:MgO:LiNbO3 single crystal fiber with step refractive index profile is achieved by a Mg-ion indiffusion process. A laser diode pumped Nd:MgO:LiNbO3 single crystal fiber extracavity frequency doubled laser at room temperature has been developed for the first time. A CA core-cladding waveguide structure of the a-axis, Nd:MgO:LiNbO3 single crystal fiber with step refractive index profile is achieved by a Mg-ion indiffusion process. A laser diode pumped Nd:MgO:LiNbO3 single crystal fiber extracavity frequency doubled laser at room temperature has been developed for the first time. A CW green laser of 10 μW (at 0.532 μm) is obtained under 19 mW (at 1.064 μm) input power..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 561 (1995)
A Stuty of the Properties of Glow Discharge in a Wide-planar-waveguide Laser Excited by DC
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The properties and temperature distribution of gas discharge in a wide planarwaveguide laser excited by DC are presented. The results of a theoretic analysis and experiments show that the allowed maximum input electric power is propotional to the discharge area for a giving maximum gas temperature increase in the dischThe properties and temperature distribution of gas discharge in a wide planarwaveguide laser excited by DC are presented. The results of a theoretic analysis and experiments show that the allowed maximum input electric power is propotional to the discharge area for a giving maximum gas temperature increase in the discharge region, and the "area scalling" law is valid in the wide planar-waveguide CO2 laser excited by DC..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 566 (1995)
Effect of Pump Power on the Output Pulses from a Synchronously Pumped Laser
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The theoretical and experimental studies of the effect of pump power on the outest pulses from a synchronously pumped dye laser under a constant cavity length arereported. It is shown that the optimal cavity length for mode-locking of the synchronously Pumped laser is related to the pump power.The theoretical and experimental studies of the effect of pump power on the outest pulses from a synchronously pumped dye laser under a constant cavity length arereported. It is shown that the optimal cavity length for mode-locking of the synchronously Pumped laser is related to the pump power..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 571 (1995)
Fabrication of InGaAs/InGaAsP Separated Confinement Strained-layer Multiple-quantum-well Lasers and the Research of Their Lasing Characteristics
[in Chinese]
The successful fabrication of the room temperature broad-area InGaAs/InGaAsP separated confinement strained-layer multiple-quantum-well (MQW) pulsed lasers at 1.49 μm emission wavelength using LP-MOVPE is reported. The lowest threshold current density (Jth) at room temperature is 0.3 kA/cm for the cavity length of 2000The successful fabrication of the room temperature broad-area InGaAs/InGaAsP separated confinement strained-layer multiple-quantum-well (MQW) pulsed lasers at 1.49 μm emission wavelength using LP-MOVPE is reported. The lowest threshold current density (Jth) at room temperature is 0.3 kA/cm for the cavity length of 2000 μm. The power saturation doesn’t occur yet while the pulsed output power is higher than 500 mW.Furthermore, the threshold current densities of these broad area lasers at varying cavity lengths have been investigated by comparing with those of the room temperature broad-area pulsed DH lasers grown by LP-MOVPE..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 575 (1995)
The General Synchronized Chaotic Laser System and Its Application
[in Chinese], and [in Chinese]
A general synchronized chaotic laser system is formed by a chaotic laser subsystem and two or more stable nonlinear response subsystems. The general synchronized Chaotic laser system achieved theoretically was predicted to operate. The application to private communication of this system was discussed.A general synchronized chaotic laser system is formed by a chaotic laser subsystem and two or more stable nonlinear response subsystems. The general synchronized Chaotic laser system achieved theoretically was predicted to operate. The application to private communication of this system was discussed..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 601 (1995)
Anti-Stokes Raman Conversion of KrF Laser Radiation in Hydrogen-rare Gas Mixture
[in Chinese], and [in Chinese]
The Raman gain coefficient in hydrogen-rare gas mixture is controlled through the collisional broadening of the hydrogen Raman transition by rare-gas molecules. This results in the suppression of the Raman conversion from the first-order Stokes to the secondorder Stokes and the increase in the conversion efficiency forThe Raman gain coefficient in hydrogen-rare gas mixture is controlled through the collisional broadening of the hydrogen Raman transition by rare-gas molecules. This results in the suppression of the Raman conversion from the first-order Stokes to the secondorder Stokes and the increase in the conversion efficiency for the lower anti-Stokes orders..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 604 (1995)
Paraxial Riemannian Geometrical Optics. Ⅱ. Basic Applications
[in Chinese], [in Chinese], and [in Chinese]
In this paper, the differential geometrical mothod is employed to study the propagation properities of light beams. Starting from the curvature of 3- dimensional Riemannian manifold, a new complex space which can contain the information of both geometrical optics and wave optics is built. Furthermore, some examples, inIn this paper, the differential geometrical mothod is employed to study the propagation properities of light beams. Starting from the curvature of 3- dimensional Riemannian manifold, a new complex space which can contain the information of both geometrical optics and wave optics is built. Furthermore, some examples, in which the complex space is used to analyse beam propagation, are also given..
Chinese Journal of Lasers
- Publication Date: Jan. 01, 1900
- Vol. 22, Issue 8, 607 (1995)
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