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RSS1995 Vol. 19, No. 4
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1995, 19(4): 194-196.
[Abstract]
[PDF 2430KB]
Abstract:
Circular polarizer for CO2 laser is an important optical component forlaser industrial processing.In this paper,a measuring method the phase retardation ofthis component was described.The measurement errors were also analyzed.
Circular polarizer for CO2 laser is an important optical component forlaser industrial processing.In this paper,a measuring method the phase retardation ofthis component was described.The measurement errors were also analyzed.
1995, 19(4): 197-200.
Abstract:
A new method for focal length measurement is presented based on the self-reference single plate shearing interferometric technique and compensation of spheri-cal mirror.The method has the advantages of simple,high accuracy and plentiful infor-mation.It can also be used for the determination of the radius of curvature of a spherical surface.Principle of the method and experimental results for different lens are given in detail.
A new method for focal length measurement is presented based on the self-reference single plate shearing interferometric technique and compensation of spheri-cal mirror.The method has the advantages of simple,high accuracy and plentiful infor-mation.It can also be used for the determination of the radius of curvature of a spherical surface.Principle of the method and experimental results for different lens are given in detail.
1995, 19(4): 201-203.
Abstract:
It is reported that a small oscillator-amplifier which consists of two cas-caded ultrashort cavity dye laser(SCDL)and a dye laser amplifier.The pumping source is an atmaspere pressure N2 laser(λ=337.1nm).The size of the system is less 20cm×15cm,compared with that described in[1],for a new optical geometry is employed.The beam diffusion loss of the N2 laser,used as the pumping source,is cut down greatly,therefore the system efficiency is raised obviously.The second SCDL cavity is constructed by using a new structure.So thermal unstability of the cavity and output features of the SCDL can be reduced.
It is reported that a small oscillator-amplifier which consists of two cas-caded ultrashort cavity dye laser(SCDL)and a dye laser amplifier.The pumping source is an atmaspere pressure N2 laser(λ=337.1nm).The size of the system is less 20cm×15cm,compared with that described in[1],for a new optical geometry is employed.The beam diffusion loss of the N2 laser,used as the pumping source,is cut down greatly,therefore the system efficiency is raised obviously.The second SCDL cavity is constructed by using a new structure.So thermal unstability of the cavity and output features of the SCDL can be reduced.
1995, 19(4): 204-208.
Abstract:
The temporal characteristics of a gain-switched Ti:sapphire laser pumped by a frequency-doubled Q-switched Nd:YAG laser have studied experimentally at the range of the pump level(pump energy/threshold energy)from 2.1 to 3.8,the cavity length from 20cm to 60cm.According to the theoretical model of the temporal characteristics for the gain-switching laser oscillator,the buildup time and pulse-width of the oscillating mode depend on the pump level and the cavity length,inversely as the cavity loss,and also is not dependent on the pump pulse-width and the waveshape.The experimental result coincides well with the theoretical analysis.The laser oscillator with a short cavity length L=20cm pumped by a 10 ns pulse-width Q-switched laser outputs a 4ns shorter laser pulse.
The temporal characteristics of a gain-switched Ti:sapphire laser pumped by a frequency-doubled Q-switched Nd:YAG laser have studied experimentally at the range of the pump level(pump energy/threshold energy)from 2.1 to 3.8,the cavity length from 20cm to 60cm.According to the theoretical model of the temporal characteristics for the gain-switching laser oscillator,the buildup time and pulse-width of the oscillating mode depend on the pump level and the cavity length,inversely as the cavity loss,and also is not dependent on the pump pulse-width and the waveshape.The experimental result coincides well with the theoretical analysis.The laser oscillator with a short cavity length L=20cm pumped by a 10 ns pulse-width Q-switched laser outputs a 4ns shorter laser pulse.
1995, 19(4): 209-213.
Abstract:
This paper intruduces a new pulse solide laser power supply and analyses the operation mechanism theoritically in detail.The power supply has these features such as high repeated frequency,small size lower noise,high efficiency and convinent adjustment,and can be used in single lamp pump system as well as double lamps pump system,and other practical application.
This paper intruduces a new pulse solide laser power supply and analyses the operation mechanism theoritically in detail.The power supply has these features such as high repeated frequency,small size lower noise,high efficiency and convinent adjustment,and can be used in single lamp pump system as well as double lamps pump system,and other practical application.
1995, 19(4): 214-221.
Abstract:
A theoretical model of Er3+/Yb3+ co-doped fibre amplifier,based on the one of Er3+-doped fibre amplifier,as presented in this paper,by analysing some of the references concerned.The performances of the signal,the pump,and the amplified spontaneous emission(ASE)in the Er3+/Yb3+ co-doped fibre can be simulated with this model.Some of results from this model are significant and interesting.
A theoretical model of Er3+/Yb3+ co-doped fibre amplifier,based on the one of Er3+-doped fibre amplifier,as presented in this paper,by analysing some of the references concerned.The performances of the signal,the pump,and the amplified spontaneous emission(ASE)in the Er3+/Yb3+ co-doped fibre can be simulated with this model.Some of results from this model are significant and interesting.
1995, 19(4): 222-226.
Abstract:
Based on the disscusing of laser propagation properties in sea,this paper points out that the recieved energy consists of sea-water backscatter and object reflection,and the later is quite weak,and has a large dynamic range of 105.So,it is necessary to have a gain control system of photomultiplier tube (PMT)to compensate the signal variation.This paper introduces a practical photo-multiplier gain control(PMGC)system,the system has beter dynamic range of 104 and has been used in a un-derwater object laser detection system.
Based on the disscusing of laser propagation properties in sea,this paper points out that the recieved energy consists of sea-water backscatter and object reflection,and the later is quite weak,and has a large dynamic range of 105.So,it is necessary to have a gain control system of photomultiplier tube (PMT)to compensate the signal variation.This paper introduces a practical photo-multiplier gain control(PMGC)system,the system has beter dynamic range of 104 and has been used in a un-derwater object laser detection system.
1995, 19(4): 227-229.
Abstract:
The pulse width adjustable pulse generators are usually used in accurate measurement.This paper introduces a high speed optical pulse generator,which enables continually to adjust the pulse width from 10ns to 500ns.The pulse superposition prin-ciple is used in driving circuit to vary the width of driving pulse.
The pulse width adjustable pulse generators are usually used in accurate measurement.This paper introduces a high speed optical pulse generator,which enables continually to adjust the pulse width from 10ns to 500ns.The pulse superposition prin-ciple is used in driving circuit to vary the width of driving pulse.
1995, 19(4): 230-233.
Abstract:
The electronic ceramics consisting of Al2O3-WO3 system was synthesized by laser sintering technique.This material has negative temperature coefficient(NTC)and linear resistance-temperature(R-T)properties.In the range of 10℃ to 150℃。X-ray photographic powder analysis in dicated that the conducting phase in the specimen is AlxWO3─a nonequlibrium product.
The electronic ceramics consisting of Al2O3-WO3 system was synthesized by laser sintering technique.This material has negative temperature coefficient(NTC)and linear resistance-temperature(R-T)properties.In the range of 10℃ to 150℃。X-ray photographic powder analysis in dicated that the conducting phase in the specimen is AlxWO3─a nonequlibrium product.
1995, 19(4): 239-243.
Abstract:
The laser diodes and photoelectron detectors can be used in the range over 10GHz,It is very important to have high transfer efficiency and better frequency response feature for transmiting and recieving units.This paper introduces the matching technology of high speed laser diode thoroughly,design principles and applications of three kinds of matching networks,in detail.
The laser diodes and photoelectron detectors can be used in the range over 10GHz,It is very important to have high transfer efficiency and better frequency response feature for transmiting and recieving units.This paper introduces the matching technology of high speed laser diode thoroughly,design principles and applications of three kinds of matching networks,in detail.
1995, 19(4): 244-247.
Abstract:
In an optical system,"cat eye effect" can be modeled as a focus lens sys-tem.Based on the model and Fourier transform,"cat eye effect" is proved while a laser beam is projected on a "eat eye effect" system at an arbitrary incident angle,it will re-turn along incident direction,Finally,the comparision of reflectance of"cat eye effect" objects and ordinary objects is made.
In an optical system,"cat eye effect" can be modeled as a focus lens sys-tem.Based on the model and Fourier transform,"cat eye effect" is proved while a laser beam is projected on a "eat eye effect" system at an arbitrary incident angle,it will re-turn along incident direction,Finally,the comparision of reflectance of"cat eye effect" objects and ordinary objects is made.
1995, 19(4): 251-254.
Abstract:
This paper describes the necessity and the performances of a multifunc-tion instrument for assembling optical head.The design and assembly process of the in-strument are also introduced.At the end,several applications of the instrument during the course of research and assemble are illustrated.It's significant to actual work.
This paper describes the necessity and the performances of a multifunc-tion instrument for assembling optical head.The design and assembly process of the in-strument are also introduced.At the end,several applications of the instrument during the course of research and assemble are illustrated.It's significant to actual work.
1995, 19(4): 255-256.
Abstract:
Usually,a frequency stabilized He-Ne laser is used as a light source in an accurate measurements.This paper introduces a small frequency-stabilized He-Ne laser。The laser has small size,can be used in bad enviroment.To obtain long lifetime and better frequency stabilization,the structure of the laser is improved to increase cathod area,protect the has pollution,select the suitable materials and processing.
Usually,a frequency stabilized He-Ne laser is used as a light source in an accurate measurements.This paper introduces a small frequency-stabilized He-Ne laser。The laser has small size,can be used in bad enviroment.To obtain long lifetime and better frequency stabilization,the structure of the laser is improved to increase cathod area,protect the has pollution,select the suitable materials and processing.
