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Dark-current of field-assisted GaAs semiconductor photocathodes 场辅助砷化镓半导体光电阴极的暗电流
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294652
Jinmin Li
{"title":"Dark-current of field-assisted GaAs semiconductor photocathodes","authors":"Jinmin Li","doi":"10.1117/12.2294652","DOIUrl":"https://doi.org/10.1117/12.2294652","url":null,"abstract":"The dark-current of GaAs field-assisted photocathodes with red and near infrared response is larger than that of common GaAs photocathodes. The major source of dark- current of the photocathodes is impact ionization of hot holes in high field deple- tion region. In this paper, a model and creating mechanism of impact ionization in the photocathodes is described in detail, and a specific expression of the dark-curren of the photocathodes at different operation conditions can be predicted once the appro- priate parameters have been determined. It may be helpful to design a field-assisted photocathode and choose an optimum operation condition.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116370392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on photovoltaic effect of P-N junction P-N结光电效应研究
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294844
Zhonghou Liu
{"title":"Study on photovoltaic effect of P-N junction","authors":"Zhonghou Liu","doi":"10.1117/12.2294844","DOIUrl":"https://doi.org/10.1117/12.2294844","url":null,"abstract":"Based on the equivalent electric current source theorem, the reason for photovoltaic theory's error is analysed in the present paper, and the basis of correction the classical photovoltaic theory and the new idea are established here. The voltage in open circuit is given by the classical photovoltaic theory as follow:","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114761621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical computation for measurement of gaussian beam divergency using grating 用光栅测量高斯光束发散度的理论计算
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294731
C. Zhou
{"title":"Theoretical computation for measurement of gaussian beam divergency using grating","authors":"C. Zhou","doi":"10.1117/12.2294731","DOIUrl":"https://doi.org/10.1117/12.2294731","url":null,"abstract":"A method to measure the divergency of a singlemode TEMoo laser Gaussian beam using grating with a range of Q parameters is presented through computation with theoretical error about 1%, which is from error analysis using one-dimension regression equations.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114872262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical implementation of neural network models and photon-echo effect 光学实现的神经网络模型和光子回波效应
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294867
M. Belov
{"title":"Optical implementation of neural network models and photon-echo effect","authors":"M. Belov","doi":"10.1117/12.2294867","DOIUrl":"https://doi.org/10.1117/12.2294867","url":null,"abstract":"Properties of the photon-echo effect are theoretically investigated for implementation of neural network models in optics. Optical schemes of the HopfieXd's network, the second-order neural network as well as the neural network with retarded response are proposed on this basis. The importance of an additional time coordinate inherent in the photon-echo effect is shown.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124047351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An enlightening viewpoint and new result on improving frequency limit of high frequency electro-optic modulation 提高高频电光调制频率限制的一个有启发性的观点和新成果
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294666
Ting-wan Wu
{"title":"An enlightening viewpoint and new result on improving frequency limit of high frequency electro-optic modulation","authors":"Ting-wan Wu","doi":"10.1117/12.2294666","DOIUrl":"https://doi.org/10.1117/12.2294666","url":null,"abstract":"In this paper we probe into the principle of traveling-wave modulation with which the frequency limit in high-frequency modulation can be overcome, as it is known to all. Developing a new viewpoint and method, we have corrected the fore theoretical result.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124189578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A phased array laser made of GaAs/GaAlAs graded barrier single quantum well structure GaAs/GaAlAs梯度势垒单量子阱结构相控阵激光器
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294768
Long Zhu
{"title":"A phased array laser made of GaAs/GaAlAs graded barrier single quantum well structure","authors":"Long Zhu","doi":"10.1117/12.2294768","DOIUrl":"https://doi.org/10.1117/12.2294768","url":null,"abstract":"A phased array laser made of MOCVD-grown GaAs / GaAlAs graded barrier separate confinement heterostructure single quantum well (GBSC SQW) wafer was investigated. The threshold current of the array composed of ten ridge waveguide lasers was 67mA, linear output power was more than 500mW, and the external differential quantum efficiency was 60%. The configuration of the array is consisted of strongly coupling central region and weakly coupling mirror regions, and the effect of the geometrical configuration of the strongly coupling region on the coupled array supermode was examined.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126316301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of signal-to-noise ratio in readout system of the magneto-optic memory 磁光存储器读出系统的信噪比分析
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294684
V. Sobolev
{"title":"Analysis of signal-to-noise ratio in readout system of the magneto-optic memory","authors":"V. Sobolev","doi":"10.1117/12.2294684","DOIUrl":"https://doi.org/10.1117/12.2294684","url":null,"abstract":"It is represented the analysis of signal-to-noise ratio according to the characteristics of the optical readout system elements. For any given value of the Kerr rotation we found the optimum angles between the plane of polarization of the lazer beam and the axes of analyzer and the partially polarizing beam splitter(PPBS);the correlation of the coefficients of the PPBS transmission for P- and S-polarizations , for which signal-to-noise ratio reaches it's maximum value.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121925423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dispersion of thermo-optic coefficients of some optical fibre materials 某些光纤材料热光系数的色散
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294814
G. Ghosh
{"title":"Dispersion of thermo-optic coefficients of some optical fibre materials","authors":"G. Ghosh","doi":"10.1117/12.2294814","DOIUrl":"https://doi.org/10.1117/12.2294814","url":null,"abstract":"Refractive index, its dispersion and their variations with temperature are analysed in a physically meaningful model to verify the presently available experimental data on the temperature dependence of zero dispersion wavelength and cut-off wavelength for silica and fluoride glass optical fibre materials.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"7 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of weatherproof LED 开发防风雨LED
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294642
S. Usuda
{"title":"Development of weatherproof LED","authors":"S. Usuda","doi":"10.1117/12.2294642","DOIUrl":"https://doi.org/10.1117/12.2294642","url":null,"abstract":"Light emitting diodes (LEDs) incorporating a newly developed passivation LED chip and sealed with an organic ADC monomer have excellent characteristics in weather resistance, heat resistance, and chemical resistance. Various weatherproof tests have proved that the weatherproof LEDs are applicable to outdoor use where conven- tional epoxy LEDs cannot be used.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134039977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microcomputer-based speckle pattern imaging system 基于微机的散斑图案成像系统
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294693
Y. Gong
{"title":"Microcomputer-based speckle pattern imaging system","authors":"Y. Gong","doi":"10.1117/12.2294693","DOIUrl":"https://doi.org/10.1117/12.2294693","url":null,"abstract":"An automatic speckle pattern imaging system for measuring minute displacement without contact is presented in this paper. The system uses double-exposure method to produce the speckle pattern which is transformed into digital signal by CCD camera and A / D converter and then processed by a microcomputer -based imaging system for noise filtering, feature extraction and result display. The basic relation of the measurements, the system setup, the basic idea of the noise filtering and feature extraction are described, and the experimental results are given.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132800948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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