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RSS1994 Vol. 18, No. 5
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1994, 18(5): 257-261.
[Abstract]
[PDF 924KB]
Abstract:
The three-dimensional particle dynamic analyzer is a kind of laser velocity-measuring instruments with laser doppler frequency and phase deviation,which is widely used in measuring of the velocity and diameter of particles in two-phase folw.During the processes of data acquisition,the original data doctiments,which are produced automatically and stored in binary system,are not only unconvenient for reading butalso unable to transfer directly for next step calculation.In this paper,a new data processing methed used C language program has been put forword to obtain the characteristics of particles,which is convenient for further utilization and development of original data software pf 3D-PDA.
The three-dimensional particle dynamic analyzer is a kind of laser velocity-measuring instruments with laser doppler frequency and phase deviation,which is widely used in measuring of the velocity and diameter of particles in two-phase folw.During the processes of data acquisition,the original data doctiments,which are produced automatically and stored in binary system,are not only unconvenient for reading butalso unable to transfer directly for next step calculation.In this paper,a new data processing methed used C language program has been put forword to obtain the characteristics of particles,which is convenient for further utilization and development of original data software pf 3D-PDA.
1994, 18(5): 261-263.
Abstract:
By using the confocal and scanning principles,a prototype of confocal laser scanning microscope is developed.
By using the confocal and scanning principles,a prototype of confocal laser scanning microscope is developed.
1994, 18(5): 264-268.
Abstract:
Viewing angle is an important characteristic in holographic stereoscopical showing. In this paper, the precise definition of viewing angle and related parameters have been given,and some expressions for calculating the viewing angle have been obtained.Finally,discussing of some practical problems has been made.
Viewing angle is an important characteristic in holographic stereoscopical showing. In this paper, the precise definition of viewing angle and related parameters have been given,and some expressions for calculating the viewing angle have been obtained.Finally,discussing of some practical problems has been made.
1994, 18(5): 268-270.
Abstract:
The purpose of the article is to intreduce an absorber used in measuring of UV high energy.The absorber has the features of the flat spectrum response from 0.19μm to 0.35μm,and the with standing pulse energy density up to 5J/cm2 at 0.248μm.
The purpose of the article is to intreduce an absorber used in measuring of UV high energy.The absorber has the features of the flat spectrum response from 0.19μm to 0.35μm,and the with standing pulse energy density up to 5J/cm2 at 0.248μm.
1994, 18(5): 271-277.
Abstract:
A new principle for spontaneous-pulse-mode-locked laser is first presented,in this paper.The principle mainly is that a optical element is inserted into a single straight cavity to construct a nonlinear cavity to realize the spontaneous mode-locking operation.The physical model and mathematical equations of the laser are established. The results of numerical calculation have been analyzed.The selt-starting APM condition,the optimum operating condition and the relationship between design parameters and ratio of pulse-width-shortening are analyzed.The calculation results can be used in various laser system.
A new principle for spontaneous-pulse-mode-locked laser is first presented,in this paper.The principle mainly is that a optical element is inserted into a single straight cavity to construct a nonlinear cavity to realize the spontaneous mode-locking operation.The physical model and mathematical equations of the laser are established. The results of numerical calculation have been analyzed.The selt-starting APM condition,the optimum operating condition and the relationship between design parameters and ratio of pulse-width-shortening are analyzed.The calculation results can be used in various laser system.
1994, 18(5): 277-280.
Abstract:
According to a laser focusing system design with the help of theory of laser optics,the main design parameters of Gaussian beam passing through the system are precisely calculated by using matrix optics.These parameters are compared with the design parameters of using geometrical optics in this paper.
According to a laser focusing system design with the help of theory of laser optics,the main design parameters of Gaussian beam passing through the system are precisely calculated by using matrix optics.These parameters are compared with the design parameters of using geometrical optics in this paper.
1994, 18(5): 281-289.
Abstract:
Two tunable Cr4+-doped lasers──Cr4+:forsterite laser and Cr4+:YAG laser──are mainly introduced,emphasizing their spectroscop and laser performances,and several other Cr4+-doped new laser materials under development are appraised and prospected simply.
Two tunable Cr4+-doped lasers──Cr4+:forsterite laser and Cr4+:YAG laser──are mainly introduced,emphasizing their spectroscop and laser performances,and several other Cr4+-doped new laser materials under development are appraised and prospected simply.
1994, 18(5): 289-292.
Abstract:
In laser melting-cladding process,the surface fold easily happen.In this paper,the reason of causing surface fold in laser melting-cladding layer is investigated,and it shows the solution way.
In laser melting-cladding process,the surface fold easily happen.In this paper,the reason of causing surface fold in laser melting-cladding layer is investigated,and it shows the solution way.
1994, 18(5): 293-296.
Abstract:
A laser beam analysis method is proposed by using the beam effective radius R(z)with the measurements of beam width d(z)and beam divergence angle θ.The location of the beam z0 and the times-diffraction-limit-factor M2 can be determined with relative high accuracy. The method is usable for CW Iaser beam,repetition pulsed laser beam and single pulsed laser beam.Two practical apparatus designs are also proposed.
A laser beam analysis method is proposed by using the beam effective radius R(z)with the measurements of beam width d(z)and beam divergence angle θ.The location of the beam z0 and the times-diffraction-limit-factor M2 can be determined with relative high accuracy. The method is usable for CW Iaser beam,repetition pulsed laser beam and single pulsed laser beam.Two practical apparatus designs are also proposed.
1994, 18(5): 297-302.
Abstract:
Based on geometrical optics and beam optics,the first-order design theory of the reversal parabolic gradient-index rod lens used as the imaging elements and laser beam transformation elements(e. g laser collimators,focusing lens,laser diode-fiber coupler)is established systematically in this paper by using matrix optics.
Based on geometrical optics and beam optics,the first-order design theory of the reversal parabolic gradient-index rod lens used as the imaging elements and laser beam transformation elements(e. g laser collimators,focusing lens,laser diode-fiber coupler)is established systematically in this paper by using matrix optics.
1994, 18(5): 303-305.
Abstract:
In this paper, a new measuring device characterized by the performances of measuring range from 5mm to 60mm, accuracy ±0.02mm is reported.The device is composed mainly of a scanning laser and a optical system,This paper describes the principles of the device and analyzes the measuring accuracy.
In this paper, a new measuring device characterized by the performances of measuring range from 5mm to 60mm, accuracy ±0.02mm is reported.The device is composed mainly of a scanning laser and a optical system,This paper describes the principles of the device and analyzes the measuring accuracy.
1994, 18(5): 306-309.
Abstract:
The laser protection is an important subject in laser application.A brown laser protection plastic has been developed by using methyl methacrylate as a substrate and doping organic tungsten salt and anthraquinone dyes in the substrate. The laser protection plastic has the features of good physical-chemical quality,high visual trans-mittance and wide laser protection bands of eight laser wavelengths.
The laser protection is an important subject in laser application.A brown laser protection plastic has been developed by using methyl methacrylate as a substrate and doping organic tungsten salt and anthraquinone dyes in the substrate. The laser protection plastic has the features of good physical-chemical quality,high visual trans-mittance and wide laser protection bands of eight laser wavelengths.
1994, 18(5): 310-312.
Abstract:
This peper gives the calculation formula of e,o beam intensity ratio,and the ratio is changeable with wavelength of light through the 90°polarization beamsplit prism. The beamsplit intensity ratio is well in agreement with calculation value at λ=6328Å.
This peper gives the calculation formula of e,o beam intensity ratio,and the ratio is changeable with wavelength of light through the 90°polarization beamsplit prism. The beamsplit intensity ratio is well in agreement with calculation value at λ=6328Å.
1994, 18(5): 313-316.
Abstract:
In this paper,an IBM PC/XT computer controlled autocorrelator and datum acquisition processing system for measurements of picosecond and femtosecond pulses and dynamic processes is described. This system is applied not only to intensity autocorrelation measurement,but also to interferometric autocorrelation measurement. The temporal resolution of this system is about 0.3 fs and the sensitivity is in the scale of mocrovoltages.
In this paper,an IBM PC/XT computer controlled autocorrelator and datum acquisition processing system for measurements of picosecond and femtosecond pulses and dynamic processes is described. This system is applied not only to intensity autocorrelation measurement,but also to interferometric autocorrelation measurement. The temporal resolution of this system is about 0.3 fs and the sensitivity is in the scale of mocrovoltages.
1994, 18(5): 317-320.
Abstract:
This paper induces and appraises the medicine mechanism of laser,application situations and recent advances,points out the developing direction of laser medicine.
This paper induces and appraises the medicine mechanism of laser,application situations and recent advances,points out the developing direction of laser medicine.
