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A real time optical neural networks using programmable LCTV spatial light modulator 基于可编程液晶电视空间光调制器的实时光神经网络
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294870
Shining Yang
{"title":"A real time optical neural networks using programmable LCTV spatial light modulator","authors":"Shining Yang","doi":"10.1117/12.2294870","DOIUrl":"https://doi.org/10.1117/12.2294870","url":null,"abstract":"A new memory modle of optical neural networks called the reflexive associative memory is implemented in real-time using programmable liquid crystal television (LCTV) in our experiment. In this model the vectors are stored in a memory matrix in the form of vector pairs. Not only a full vector prestored in neural networks can be recalled from a partial information of the vector, but the other vector of the prestored vector pair can also be recalled.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"34 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":"133075222","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
Applications of FT-IR emission spectroscopy for superconductor YBa2Cu3 Ox and rare earth sesquioxides 超导体yba2cu3ox及稀土倍半氧化物的红外发射光谱研究
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294828
Jun Yang
{"title":"Applications of FT-IR emission spectroscopy for superconductor YBa2Cu3 Ox and rare earth sesquioxides","authors":"Jun Yang","doi":"10.1117/12.2294828","DOIUrl":"https://doi.org/10.1117/12.2294828","url":null,"abstract":"YBa,Cup superconductor orthorhombic-to-tetragonal structure phase transformation are measured. The infrared emission spectra with temperature increase show that the phase transformation occurs at 800K. The superconductivity of the sample disappear at 1000K. Rare earth sesquioxides infrared emission properties are measured. At 521 cm , , a new peak, appears in the infrared emission spectra and is split into two peaks at 528 cm and 517 cm at 1100K. The A-C-B structure phase transformation in relation to the infrared spectrum change is discussed.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"188 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":"133171357","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
Growth of Bi12geO20 (BGO): influence of stoichiometry and doping elements on photorefractive parameters Bi12geO20 (BGO)的生长:化学计量学和掺杂元素对光折变参数的影响
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294644
J. Launay
{"title":"Growth of Bi12geO20 (BGO): influence of stoichiometry and doping elements on photorefractive parameters","authors":"J. Launay","doi":"10.1117/12.2294644","DOIUrl":"https://doi.org/10.1117/12.2294644","url":null,"abstract":"Photorefractive materials have been great potential in applications such as phase conjugation, optical data processing, image amplification and laser beam steering. The purpose of this communication is to show that crystals of different batchs-nominally pure and doped-may have different characteristics thus leading to significant variations in the photorefractive properties. The influence of the crystal growth conditions was recognized in early experiments of phase conjugaison based on degenerates four wave mixing in BGO.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"263 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":"133192101","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
Discussion about the stress distribution in a high average power laser 高平均功率激光器中应力分布的讨论
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294767
Shouhuan Zhou
{"title":"Discussion about the stress distribution in a high average power laser","authors":"Shouhuan Zhou","doi":"10.1117/12.2294767","DOIUrl":"https://doi.org/10.1117/12.2294767","url":null,"abstract":"The main difficulty for these lasers is the thermal effects which induced by thermal stress. The stress distribution takes a very important part in a high average power laser. The optical distortions which include thermal focusing, stress induced biaxial focusing, stress induced birefringence can be known easily if the stress distribution is already known clearly. In order to know the stress distribution, the temperature distribution is discussed at first because the nonuniform temperature distribution is the main reason which induces the thermal stress. Our discussion mainly aimed at the the stress distribution in the high average power lasers, especially in annular geometry lasers.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"169 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":"128912208","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
The design of a repetition rate laser rangefinder 一种重复频率激光测距仪的设计
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294762
Chongjuen Den
{"title":"The design of a repetition rate laser rangefinder","authors":"Chongjuen Den","doi":"10.1117/12.2294762","DOIUrl":"https://doi.org/10.1117/12.2294762","url":null,"abstract":"In this paper, the design of a repetition rate laser rangefinder is discussed, the technical significations of a practical laser rangefinder are presented, and the ranging capacities are estimated. The program of ranging is an optimized one, and the block diagram and the time series diagram of the rangefinder are give. The experiments using a repetition rate laser rangefinder by wind cooling method have been conducted. And this kind of laser rangefinder has already put into practical use.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"37 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":"115469103","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
Experimental research on chaos operation in a CO2 laser caused by the transverse effect of the light fields 光场横向效应引起CO2激光器混沌运行的实验研究
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294835
N. Chen
{"title":"Experimental research on chaos operation in a CO2 laser caused by the transverse effect of the light fields","authors":"N. Chen","doi":"10.1117/12.2294835","DOIUrl":"https://doi.org/10.1117/12.2294835","url":null,"abstract":"The instabilities of cw-0O2 laser have been the object of extensive investigation in the field of laser instabilities and chaos. It is well known that a chaos operation of a system requires at least three dynamical variables in phase-space. Therefore, the CO2 lasers used in chaos investigation are all supplied with either modulation or feedback to enlarge the phase-space dimensionality. Recently, it is come to be known that some instabilities maybe result from the transverse distribution of laser fiedl. When the transverse freedom degree is considered, theoatical analysis shows that the Maxwell-Bloch equations change obviously. Different simplified models have been discussed priliminarily, but to data no clear experimental demonstration has been given. Here we report our experimental studies on instabilities caused by the transverse effects. Chaos operation are first observed in a single-lingitudinal, multi-transverse mode cw-0O2 laser in the abscence of any kinds of modulation or feedback. The laser output evolves from stability to chaos along different routes when the laser parameter are changed. Our experiment shows that the transverse distribution of light field and population inversion is an important factor in causing laser instabilities.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"39 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":"114781299","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
The application of improved Fourier transform profilometry 改进傅里叶变换轮廓术的应用
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294861
Jian Li
{"title":"The application of improved Fourier transform profilometry","authors":"Jian Li","doi":"10.1117/12.2294861","DOIUrl":"https://doi.org/10.1117/12.2294861","url":null,"abstract":"3-D object shape can be profiled by using optical noncontact measurement methods, such as improved Fourier transform profilometry, etc. These methods restore the object shape through analyzing the continuous phase distribution of an optical structured field that is modulated by the shape. However, in practice, many shapes to be measured have steep height variation and may cause shadows in the modulated phase distribution. Such kind of object shape can not be restored. We propose a method to solve this problem. With this method, the improved Fourier transform profilometry can be used in many areas. This paper describes the theory.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"35 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":"114562526","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
Some optical fiber probes design and its application 几种光纤探头的设计及其应用
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294843
S. Dai
{"title":"Some optical fiber probes design and its application","authors":"S. Dai","doi":"10.1117/12.2294843","DOIUrl":"https://doi.org/10.1117/12.2294843","url":null,"abstract":"In the field of the measuring technology, the request of noncontacting measurement is raised for some purposes. The advantages of performing noncontacting measurement by utilizing optical-fiber sensors are their simple structure, small size, anti-electromagnetical field interference, and wide frequency capability. Fig. 1 shows the general principle of the optical fiber noncontacting sensor. The transmission fibers illuminate the test object, and the receiving fibers convey the reflected light to a detector, the output Y is related to the structure parameters of fiber probe S, the reflectivity p and roughness coefficient R. of test object, the distance X, and the illumination power P., i. e.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"33 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":"115039428","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 direct calculation method of IR remote sensing systems' detectability for forest fire 红外遥感系统对森林火灾可探测性的直接计算方法
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294804
Xiaoling Zhang
{"title":"A direct calculation method of IR remote sensing systems' detectability for forest fire","authors":"Xiaoling Zhang","doi":"10.1117/12.2294804","DOIUrl":"https://doi.org/10.1117/12.2294804","url":null,"abstract":"IR Remote Sensing is an effective measure of monitoring the forest fire, especially, for those areas which can not be reached by the forest guards themselves or their sightline. We have carried out some analysis about the target resolution of IR line scanner[ 1] . Here, we further offer a direct calculation method of detectable lower limit of fire areas which are smaller than the instantaneous field of view (IFOV) using the systems' practically measured parameter NETD. Starting from the general condition, the sensitive equation is [ 2]","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"179 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":"122140442","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
New development in measuring large gradient temperature field with optical interference 光学干涉测量大梯度温度场的新进展
Marketplace for Industrial Lasers Pub Date : 1990-07-01 DOI: 10.1117/12.2294696
Kexin Xu
{"title":"New development in measuring large gradient temperature field with optical interference","authors":"Kexin Xu","doi":"10.1117/12.2294696","DOIUrl":"https://doi.org/10.1117/12.2294696","url":null,"abstract":"In this paper, we report a new development in the study of large gradient natural convection temperature field around a horizontally positioned cylinder by means of optical interference. The errors in measuring the temperature field caused by the light deflection and the method to reduce the errors are discussed. A series of interference patterns corresponding to the cylinder diameter of 33-86 millimeters and the wall temperature of 200-1180 C are presented. All these interference patterns are analyzed by the image processing. Results show that it is possible to obtain a high precision profile of the large gradient temperature field around the cylinder by means of optical interference. The boundary layer is as thick as several tens millimeters above the cylinder and 3-6 millimeters under and beside the cylinder. The results also show that the maximum value of the refractive index gradient does not occur at the surface of the cylinder.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"1 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":"129345736","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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