中国开放科研知识云: 检索

Simulations of far-field optical beam quality influenced by the thermal distortion of the secondary mirror for high-power laser system 会议论文
20th International Symposium on High Power Systems and Applications 2014, Chengdu, August 25
作者: Guo, Ruhai; Chen, Ning; Zhuang, Xinyu; Wang, Bing

收藏 | 浏览/下载：31/0 | 提交时间：2016/07/18

New method of measurement laser beam on focal plane 会议论文
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications III, February 4, 2014 - February 6, 2014, San Francisco, CA, United states
Liu M.; Wang X.; Wang B.; Jiang Y.

收藏 | 浏览/下载：17/0 | 提交时间：2015/04/27

High power semiconductor laser beam combining technology and its applications 会议论文
2nd International Symposium on Laser Interaction with Matter, LIMIS 2012, September 9, 2012 - September 12, 2012, Xi'an, Shaanxi, China
Lijun W.; Cunzhu T.; Hangyu P.; Jun Z.

收藏 | 浏览/下载：12/0 | 提交时间：2014/05/15

Far-field beam quality evaluation of high-power unstable resonators TEA CO2 Laser 会议论文
2nd International Symposium on Laser Interaction with Matter, LIMIS 2012, September 9, 2012 - September 12, 2012, Xi'an, Shaanxi, China
Guo R.; Chen N.; Shi K.; Wang B.

收藏 | 浏览/下载：17/0 | 提交时间：2014/05/15

All-solid-state high beam quality 1053nm nd: Glass amplifier at repetition frequency (EI CONFERENCE) 会议论文
2nd International Conference on Optical, Electronic Materials and Applications 2012, OEMA 2012, May 25, 2012 - May 26, 2012, Chongqing, China
Tang X.; Fan Z.; Qiu J.; Yu J.; Hou L.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

A laser amplifier of LD pumping Nd: glass with a high beam quality and stability which amplifies nanosecond laser pulse has been developed in this paper. The device adopts the major technology of "LD pumping multi pass amplification together". Beam transmission is designed with the technology of "inhibition of diffraction effect active control and spatial filtering". (2012) Trans Tech Publications Switzerland.

High beam quality all-solid-state 1053nm nd: Glass amplifier shaping by LCSLM at repetition frequency (EI CONFERENCE) 会议论文
2nd International Conference on Optical, Electronic Materials and Applications 2012, OEMA 2012, May 25, 2012 - May 26, 2012, Chongqing, China
Qiu J.; Fan Z.; Tang X.; Lian F.; Zhang X.; Ma Y.

收藏 | 浏览/下载：74/0 | 提交时间：2013/03/25

A laser amplifier of LD pumping Nd: glass with a high beam quality and stability the modulation degree near field is less than 1.23:1. (2012) Trans Tech Publications which amplifies nanosecond laser pulse Switzerland. has been developed in this paper. Under 1Hz repetition frequency when the flat top pulse of 3 ns width and 1 nJ energy is injected as the seed pulse the average output energy of the laser amplifier is 115.3 mJ with a net gain of 109 the energy dispersion degree of the outputting laser is no more than 2%

Experiments of second harmonic generation output in pulsed TEA CO 2 laser (EI CONFERENCE) 会议论文
High-Power Lasers and Applications V, October 18, 2010 - October 19, 2010, Beijing, China
Guo R.; Li D.

收藏 | 浏览/下载：42/0 | 提交时间：2013/03/25

It is always the hot subject to realize the output of high-power laser in the range of 3-5m wavelength. This rang of wave band has greatly important applications in military because it located in the atmosphere window. Generally there are two ways to obtain this range of laser wavelength. One way is through optical parameter oscillation (OPO) from shorter laser wavelength and the other is through second harmonic generation (SHG) from longer laser wavelength. Firstly the comparison between tow nonlinear crystals ZnGeP2 and AgGaSe2 is conducted for their nonlinear coefficient and damaging threshold in theory. The theoretical results show that the crystal AgGaSe 2 is more suitable for the SHG of pulsed TEA CO2 laser. When using pulsed TEA CO2 laser with wavelength of 9.3m to pumping AgGaSe2 SHG crystal the wavelength of 4.65m is obtained. In the condition of repetition rate 100Hz the upmost output power of single pulse is up to level of 1W which corresponding efficiency of SHG is about 6%. The experimental results show that the polarization of laser beam has greatly influence on the SHG output of the crystal. Under the radiation of 3MW/cm 2 from fundamental wave and the right position for maximal SHG output in the crystal when polarization of laser beam rotates 4.5 the SHG output of energy decrease about 30%. The research of this paper will make a foundation for further development of mid-infrared laser. 2010 Copyright SPIE - The International Society for Optical Engineering.

Analysis of laser jamming to satellite-based detector (EI CONFERENCE) 会议论文
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
Wang S.-W.; Guo L.-H.; Guo R.-H.

收藏 | 浏览/下载：17/0 | 提交时间：2013/03/25

The reconnaissance satellite communication satellite and navigation satellite used in the military applications have played more and more important role in the advanced technique wars and already become the significant support and aid system for military actions. With the development of all kinds of satellites anti-satellite laser weapons emerge as the times require. The experiments and analyses of laser disturbing CCD (charge coupled detector) in near ground have been studied by many research groups but their results are not suitable to the case that using laser disturbs the satellite-based detector. Because the distance between the satellite-based detector and the ground is very large it is difficult to damage it directly. However the optical receive system of satellite detector has large optical gain so laser disturbing satellite detector is possible. In order to determine its feasibility the theoretical analyses and experimental study are carried out in the paper. Firstly the influence factors of laser disturbing satellite detector are analyzed in detail which including laser power density on the surface of the detector after long distance transmission and laser power density threshold for disturbing etc. These factors are not only induced by the satellite orbit but dependence on the following parameters: laser average power in the ground laser beam quality tracing and aiming precision and atmospheric transmission. A calculation model is developed by considering all factors which then the power density entering into the detector can be calculated. Secondly the laser disturbing experiment is performed by using LD (laser diode) with the wavelength 808 nm disturbing CCD 5 kilometer away which the disturbing threshold value is obtained as 3.5510-4mW/cm2 that coincides with other researcher's results. Finally using the theoretical model the energy density of laser on the photosensitive surface of MSTI-3 satellite detector is estimated as about 100mW/cm2 which is largely exceed the disturbing threshold and therefore verify the feasibility of using this kind of laser disturbing the satellite-based detector. According to the results. using the similar laser power density absolutely saturate the requirements to laser disturbing satellite-based detector. If considering the peak power of pulsed laser even decrease laser average power it is also possible to damage the detector. This result will provide the reliable evidences to evaluate the effect of laser disturbing satellite-based detector. 2009 SPIE.

High power diode laser with beam coupling (EI CONFERENCE) 会议论文
Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China
Gu Y.; Wang L.; Feng G.; Shan X.; Yin H.; Liu Y.

收藏 | 浏览/下载：52/0 | 提交时间：2013/03/25

As the increasing applications of the semiconductor lasers in the laser processing the single 2-D stack optic-power density has not satisfied the actual requirements. It demands to couple several diode laser stack beams to one to improve the brightness and it becomes the central issue to adopt the appropriate beam coupling technology which would offer high quality and high efficiency. In this paper it mainly introduces the beam shaping and the technology of spatial coupling polarization coupling and wavelength coupling. The coupling key elements are presented and indicated. Finally the development of the diode laser on beam coupling in our country fell behind through analyzing the statement of the world. Our lab is studying on polarization coupling and wavelength coupling. We gain some results by phase which the polarization coupling efficiency can achieve 90% for two LD stacks with seven bars whose luminous wavelength is 975nm and980nm.By two 808nm diode laser coupling the efficiency of 60% can be achieved after focusing to the beam size of 22mm2. 2008 SPIE.

Research on 10.6 m laser beam monitoring in CO2 laser processing system (EI CONFERENCE) 会议论文
Infrared Materials, Devices, and Applications, November 12, 2007 - November 15, 2007, Beijing, China
Shi Y.; Gao Y.; Deng W.; Shao S.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

It is a key point of CO2 laser beam monitoring in the CO 2 laser processing system to achieve alignment between CO2 laser and PL (pointing and launching) system. By monitoring the angle offset of CO2 laser beam the compensation can be gotten witch is given to fast-steering mirror to rectify the direction of laser beam. But the normal photoelectric detector can not get the laser signal because of CO2 laser's high energy and long wavelength. Its wavelength is 10.6m and its power can reach kW level. Consequently it is difficult to detect the high-energy 10.6m laser beam directly. So we monitored the output mirror of laser resonator superseded the laser beam indirectly. The laser beam monitoring system could be designed based on CCD laser auto-collimation angular measurement principle and image processing method. In this paper application of CCD laser auto-collimation angular measurement principle and image processing method for CO2 laser beam monitoring system is introduced particularly After design fabrication and alignment the monitoring system can be used for experimental study that including angular measurement accuracy and angle offset measurement of CO2 laser beam. Angle offset range and angle variation rule of CO2 laser beam is also can be acquired for further research.

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