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RSS1988 Vol. 12, No. 2
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1988, 12(2): 1-7.
[Abstract]
[PDF 357KB]
Abstract:
A relationship for optimum noise distribution in application of avalanche photodiodes(APDS)is derived.According to the relationship,a method measuring optimum multiplication factor of APDS is presented and a instrument for this measurment has been designed and manufactured. The measured results of APDS are given.
A relationship for optimum noise distribution in application of avalanche photodiodes(APDS)is derived.According to the relationship,a method measuring optimum multiplication factor of APDS is presented and a instrument for this measurment has been designed and manufactured. The measured results of APDS are given.
1988, 12(2): 8-13.
Abstract:
According to a model of the global average refractive index distribution,the ray bending.the atmospheric refractive angle,and the altitude error are calculated for various elevation and altitude.In addition, the same as calculations are performed using different refactive index distributions for five typical climate regions.Comparisons between them show that the global average distribution,in general, can be used in the middle-accuracy cases.However,it is necessary knowing about a insitu refractive index distribution for the case that a higher accuracy in required.
According to a model of the global average refractive index distribution,the ray bending.the atmospheric refractive angle,and the altitude error are calculated for various elevation and altitude.In addition, the same as calculations are performed using different refactive index distributions for five typical climate regions.Comparisons between them show that the global average distribution,in general, can be used in the middle-accuracy cases.However,it is necessary knowing about a insitu refractive index distribution for the case that a higher accuracy in required.
1988, 12(2): 14-18.
Abstract:
In this paper,the experimental procedure are presented for boronzirconium in the 45 steel surface using a transverse-flow CO2 laser with an output power of 500～2000 W modulated CW.The experimental results indicate that the microstructure and the chemical composition of the boron-zirconium alloyed layer will basically change.The alloyed layer possess the advantages, such as high hardness and good wear resistance.
In this paper,the experimental procedure are presented for boronzirconium in the 45 steel surface using a transverse-flow CO2 laser with an output power of 500～2000 W modulated CW.The experimental results indicate that the microstructure and the chemical composition of the boron-zirconium alloyed layer will basically change.The alloyed layer possess the advantages, such as high hardness and good wear resistance.
1988, 12(2): 18-23.
Abstract:
In this paper, the experimental procedure are presented for boronizing in the 60 steel surface using 2kW transverse-flow CO2 laser. The surfaces of these samples have been coated with B4C powder.Microstructural and energy spectrum analysis of the laser boronizing surfaces indicate that laser boronizing in the 60 steel surface is possiable so that it has the desired high quality surface properties.A preliminary discussion of the strengthening mechanism of the laser boronizing layer has been presented.
In this paper, the experimental procedure are presented for boronizing in the 60 steel surface using 2kW transverse-flow CO2 laser. The surfaces of these samples have been coated with B4C powder.Microstructural and energy spectrum analysis of the laser boronizing surfaces indicate that laser boronizing in the 60 steel surface is possiable so that it has the desired high quality surface properties.A preliminary discussion of the strengthening mechanism of the laser boronizing layer has been presented.
1988, 12(2): 24-26,13.
Abstract:
Plano-convex resonant cavity module is adjusted by means of the Newton's ring equi-thickness inerference.This is a useful,direct and easy method.
Plano-convex resonant cavity module is adjusted by means of the Newton's ring equi-thickness inerference.This is a useful,direct and easy method.
1988, 12(2): 27-29.
Abstract:
A SCH semiconductor laser was fabricated.The peak power is 8～13 W/facet at 2.5～3 times of threshold.Beam divergence in both directions are 15°～22°(θ⊥)and 14～18°(θ∥).
A SCH semiconductor laser was fabricated.The peak power is 8～13 W/facet at 2.5～3 times of threshold.Beam divergence in both directions are 15°～22°(θ⊥)and 14～18°(θ∥).
1988, 12(2): 30-35.
Abstract:
This is a new inspection method of reflecting prism inhomogeneity using laser holography interfence method.The method is studied in this paper.Right angled roof prism and right angled prism are measured practically the results show that the method is of reliability and accuracy.
This is a new inspection method of reflecting prism inhomogeneity using laser holography interfence method.The method is studied in this paper.Right angled roof prism and right angled prism are measured practically the results show that the method is of reliability and accuracy.
1988, 12(2): 36-39.
Abstract:
The influence of background noise on extinction coefficient is investigated.Relationship between the background noise and the extinction coefficient is given in numerical quantities.Perfect evaluation method is proposed.
The influence of background noise on extinction coefficient is investigated.Relationship between the background noise and the extinction coefficient is given in numerical quantities.Perfect evaluation method is proposed.
1988, 12(2): 39-42.
Abstract:
The pulsed carbon dioxide laser was used to irradiate the flexor surface of the right forearm in this experiment.The incidence of cutaneous erythema and the time of erythema occurrence were observed.The results showed that the higher the dose of radiant exposure,the higher is the erythema incidence.A linear dose-effect relationship was obtained and the MRD50 was approximatly 0.4J/cm2.
The pulsed carbon dioxide laser was used to irradiate the flexor surface of the right forearm in this experiment.The incidence of cutaneous erythema and the time of erythema occurrence were observed.The results showed that the higher the dose of radiant exposure,the higher is the erythema incidence.A linear dose-effect relationship was obtained and the MRD50 was approximatly 0.4J/cm2.
1988, 12(2): 43-46.
Abstract:
The circuit principle of power supply for He-Ne laser which is suitable for commercial manufacture is introduced.Compared with generad D.C.transfomers for lasers,JB-l eliminates trigger circut of muttiple voltage rectifier,and so has smaller volume, high efficiency and low cost.
The circuit principle of power supply for He-Ne laser which is suitable for commercial manufacture is introduced.Compared with generad D.C.transfomers for lasers,JB-l eliminates trigger circut of muttiple voltage rectifier,and so has smaller volume, high efficiency and low cost.
1988, 12(2): 47-50.
Abstract:
Analyses and calculations show that targets outside receiver field-of-view can become detectable through effects of diffraction and astigmatism caused by the receiver lens.
Analyses and calculations show that targets outside receiver field-of-view can become detectable through effects of diffraction and astigmatism caused by the receiver lens.
1988, 12(2): 51-54.
Abstract:
In this paper we briefly review development and possible military application of x-ray lasers,and present the nuclear-pumped x-ray laser and the laser-pumped x-ray laser.
In this paper we briefly review development and possible military application of x-ray lasers,and present the nuclear-pumped x-ray laser and the laser-pumped x-ray laser.
1988, 12(2): 58-65,46.
Abstract:
We caculated the statistical characteristic of the laser beams propagating through raindrops,in which we employed Markov's delta correlation assumption and suposed indepantance between index fluctuations induced by raindrops and turbulence respectively.Comparing with experimental data,We concluded that the beam wander and arrived angle fluctuation induced by raindrops were both larger than those by turbulence.
We caculated the statistical characteristic of the laser beams propagating through raindrops,in which we employed Markov's delta correlation assumption and suposed indepantance between index fluctuations induced by raindrops and turbulence respectively.Comparing with experimental data,We concluded that the beam wander and arrived angle fluctuation induced by raindrops were both larger than those by turbulence.
