{"title":"Optical properties of a liquid crystal microlens","authors":"T. Nose","doi":"10.1117/12.2294643","DOIUrl":"https://doi.org/10.1117/12.2294643","url":null,"abstract":"The liquid crystal microlens can be obtained by molecular orientation effects in a non-uniform electric field which is produced by the asymmetric electrode structure with a hole-patterned electrode and an ITO coated counter electrode. In this cell, an axially symmetric distribution of the liquid crystal molecules; that is, a radial distribution of refractive indices is achieved. Relations between the optical properties and the geometric factors, such as the diameter of the hole-pattern and the thickness of the cell are investigated. An optical fiber coupler with a variable coupling efficiency is prepared and its switching properties are discussed.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"146 7 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":"125863583","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}
{"title":"A new, monolithic encoding digital photodetecter array","authors":"Xuan Huang","doi":"10.1117/12.2294674","DOIUrl":"https://doi.org/10.1117/12.2294674","url":null,"abstract":"At present, each element of the photodetecter array (PDA) is an individual source providing electronic signal, it must be connected with a seperate signal amplifying circuits. The more the array elements are, the more complex the circuits are. Another problem is that this kind of PDA has a high false-code-rate. We have designed and manufactured a new monolithic encoding digital PDA adopting the Gray encoding mode which has low false-code- rate. It is made of 32 photodiodes on one silicon chip. All 32 photodiodes is divided into six groups according a certain pattern, then connected to six output points followed by six groups of hybrid integrated amplifieres where the electronic signal is amplified and out put a 6-bit binary digit according Gray code. They are all mounted in a single sealed package. If the design is changed, similar encoding digital photodetecter array can also out put other bits binary code. Some measurement results is presented.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"1230 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":"129368080","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}
{"title":"Wideband tunable UV laser sources by BBO crystal","authors":"Yi-qian Yuan","doi":"10.1117/12.2294822","DOIUrl":"https://doi.org/10.1117/12.2294822","url":null,"abstract":"We have performed the output of tunable UV laser wavelength 367.5-378.2nm, 281.8- 292.3nm, 223.2-230.8nm by P-BaB204(BBO). The sum-frequency generation between R6G dye laser and fundamental wave (W) of Nd-YAG laser by a BBO crystal cut at 38°, The output of continuously tunable over rage 376.5-378.2nm has been obtained. The pulse energy is over 1.3mJ, the conversion efficiency is 10%. The R6G dye laser, which pumped by frequency doubled YAG laser, has been frequency doubled in a BBO crystal cut at 45°, the tunable range of 281.8-292.3nm and about 8mJ pulse energy have been gained, efficiency is 30%, and the sum frequency of the pump laser's FW and the dye laser's SHG enter another BBO crystal cut at 45°, the tunable range 223.2-230.8nm, the pulse energy is over 100PJ, q=10%.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"119 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":"129716115","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}
{"title":"Study of a tunable mode 2KW CW CO2 laser","authors":"Zu-hai Cheng","doi":"10.1117/12.2294765","DOIUrl":"https://doi.org/10.1117/12.2294765","url":null,"abstract":"The beam mode and the output characteristics of a 2kw CW CO laser with tunable mode resonator (TMR), in which the beam mode can be tuned continously from TEM°, mode higher-order mode has been described. At the premise of no exchanging the structure of the resonator, in order to fit the beam quality for different targets of laser processing, it is the expectant goal to the people for long time to make the Laser can continuously select any output beam mode which it can be changed from TEMoi mode to higher-order mode. We ingeniously use the change of the relative location between the ray axis and the symmetrical centre of the active medium in this paper, it makes one set of resonator output several beam modes become in truth.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"129 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":"128295015","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}
{"title":"The study of dispersion characteristics of single mode optical fibers","authors":"Xian-hung Wu","doi":"10.1117/12.2294821","DOIUrl":"https://doi.org/10.1117/12.2294821","url":null,"abstract":"In this paper, the 4th order Runge-Kutta method (1) has been used to study the dispersion characteristics of single mode optical fiber, especially the effect of axial index dip on the dispersion characteristics. And hence a new type of index profile, Laguerre-Lorentz profile, with low dispersion in wide spetrum range has been found. These results are useful to the design and manufacture of single mode optical fibers.","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":"125011006","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}
{"title":"Study of the fine dividing technique for unity interference fringe by using OCV","authors":"Mingshan Ren","doi":"10.1117/12.2294671","DOIUrl":"https://doi.org/10.1117/12.2294671","url":null,"abstract":"Both of counting the interference fringes and fine dividing unity interference fringe are important essential technique in the field of the accurate measurement. The counting technique has been ripe, but the fine dividing technique (FDT) is just developing. There are several FDT such as: electronics method, optical frequency doubling method, CCD method and computer programing method, etc. A new FDT with opti- cally controlled varactor (OCV) is reported in this paper. A real-time data acquisition system consisted the OCV as photoelectric detector and a special interface circuit connected with microprocessor for coun- ting the interference fringes and fine dividing unity interference fringe has been developed which can print and process data. Advantages of this system are following: real-time operation, intellectuality, and it is simple, reliable and economical. The photoelectric device OCV is a kind of new type detector and is very sensitive to weak light and the spectrum response peak condition, the capacitance of the OCV has a direct relationship to light in- tensity. It is small size and fast response. This system for fine dividing of unity interference fringe with OCV device not only can be of great use for the interference fringe but also for the Moire fringe. The test results indicate: The fine dividing for unity interference fringe can be accurate to l%( /100).","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"12 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":"130090840","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}
{"title":"Study of the measurement system for high extinction ratio","authors":"Guohua Li","doi":"10.1117/12.2294651","DOIUrl":"https://doi.org/10.1117/12.2294651","url":null,"abstract":"A measurement system for high extinction ratio is reported. As improvements on common methods, several new steps are adopted in the system. This makes the system have a high sensitivity and precision.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"42 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":"116324248","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}
{"title":"Design and study of pre-amplifier of APD photoelectrical signal","authors":"Hui Liu","doi":"10.1117/12.2294709","DOIUrl":"https://doi.org/10.1117/12.2294709","url":null,"abstract":"This paper presents the application of APD photoelectrical transformation components to the technology of photomagnetical memory system. An expression for the signal-to-noise ratio has been derived by the mathematical method. This theoretical expression points out the path to improve the signal-to-noise ratio and also provides the technical requirements for selecting the components. This paper analyzes the important parameters of the APD pre-amplifier of photoelectrical signal and the measurement of equivalent input noise Eni, at the last gives the test results of the pre-amplifier.","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":"126694086","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}
{"title":"A new type of shearing SH wavefront sensor","authors":"P. Zhao","doi":"10.1117/12.2294676","DOIUrl":"https://doi.org/10.1117/12.2294676","url":null,"abstract":"In adaptive / active aptics and computer aided manufacturing of large optical mirrors, Shack- Hartmann (S-H) [ 1] method which is derived from the well-known conventional Hartmann technique is well used to test wavefront in real time because it has many advantages. a) It collects and samples virtually 100% of the light entering the optical system; b) It measures the even wavefront slope over each zone even when the phase of the light from one side of the subaperture to the other side exceeds 2ir , which is well suitable for adaptive / active optical systems as well as reflectors; c) It requires only one detector array compared to four for a shearing interferometer with same optical efficiency; d) It can also detect wavefront tilt of white light because it is independent of wavelength; e) It is mechanically less complex than the shearing interferometers, replacing optical and mechanical hardware with electronic processing. Fig. 1 shows the principle of S-H wavefront sensor. The detected wavefront and plane reference wavefront are both divided into a number of zones, usually contiguous and equal size, by S-H plate which is a small lens array and imaged into separate foci by sampling lens. The distance between couple of foci corresponding to detected wavefront and reference wavefront reveals the mean wavefront slope over each zone. From the principle, we know that S-H sensor only can measure the average wavefront slope over each zone, unable to test the slope over the area smaller than the zone. Another disadvantage of S-H sensor seems to be its sensitivity to the shape of the source to be corrected in the case of low signal conditions.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"205 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":"127033763","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}
{"title":"Monitoring the thickness of ZnO films on iso-axis magnetron sputtering using laser","authors":"Kecheng Xie","doi":"10.1117/12.2294798","DOIUrl":"https://doi.org/10.1117/12.2294798","url":null,"abstract":"The film thickness monitoring technology is one of the factors in film manufacture. In isoaxis magnetron sputtering, to detect the film thickness in real time is very important. This paper presented a method which can monitor the thickness of ZnO films in a simple, quick and accurate way as well as in real time. The method is to trace the substrates on a TCT-300 type isoaxis magnetron sputtering machine using laser directly. The sputtering machine is made in our institute.","PeriodicalId":322470,"journal":{"name":"Marketplace for Industrial Lasers","volume":"26 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":"126737427","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}
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