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Yang J.,CAS Shanghai Institute of Optics and fine Mechanics | Yang J.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques | Yang J.,University of Chinese Academy of Sciences | Hou X.,CAS Shanghai Institute of Optics and fine Mechanics | Hou X.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

Splitting performance of two parallel plates is analyzed and a design method is presented to optimize their splitting performance. Two parallel plates parallel to each other split one incident laser beam into multiple beams which are detected by a CCD camera. Because of the use of CCD camera, difference of maximum power density between received laser faculae(DMPF) should be made as little as possible. Effect of distance between plates and incident angle on difference of laser faculae is analyzed. And the calculation results show that reasonable selection of distance between plates and incident angle can minimize DMPF. The optimum distance between plates increases as Rayleigh length of laser beam increases while the optimum incident angle keeps stable under the condition of fixed coated film and fixed central wavelength of laser beam. And DMPF under corresponding optimum conditions fluctuates as Rayleigh length increases. Source


Wang J.-W.,Jiangnan University | Su Z.-P.,Jiangnan University | Su Z.-P.,Wuxi Led Electronics Company | Yuan Z.-J.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques | Zhu Y.-Q.,Jiangnan University
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

Global optimization algorithm was proposed to optimize and design LED array for generating uniform illumination distribution on target plane. An evaluation function reflecting illumination uniformity was constructed, which can reach the minimum by optimizing the LEDs positions. While the evaluation function takes the minimum value, the optimal LED array can produce highly uniform illumination distribution on target plane. The minimum value of evaluation function was found by simulated annealing algorithm, so that the circular array consisting of 12 LEDs, 4×4 and 4×5 rectangular LED array were optimized. After optimization, the three arrays produce highly uniform illumination distribution with the calculated uniformity 97%, 96% and 95%, respectively. The results show that the optimal radius of circular array does not depend on the number of LEDs. The optimal radius depends linearly on the distance between LED array plane and the target plane. For the rectangular array, the optimal separation between adjacent LEDs depends linearly on the distance between LED array plane and the target plane. The results of the proposed method were consistent with existing method, and the algorithm is simple and convenient. Source


Zhou T.,CAS Institute of Mechanics | Chen W.,CAS Institute of Mechanics | Chen W.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques | He Y.,CAS Institute of Mechanics | And 3 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

Lidar has been used for ocean remote sensing widely. The upward laser beam is distorted due sea surface. It Iimits dramatically laser transmission through sea surface and the application of Lidar under water. The beam distribution of upward laser beam through sea surface is studied based on the geometrie optical theory, three dimension wave simulation and Monte Carlo simulation respectively. Results show similar beam distribution by the three methods. The beam profile is limited in ±10° for collimated vertical upward beam. Demonstrati distribution through man-made rough water surface is conducted in a water tank. Results show that the exit angle is actually limited within ±10°. The study will be useful to the design of Lidar application under sea water. Source


Wu W.,Qufu Normal University | Wu W.,CAS Shanghai Institute of Optics and fine Mechanics | Wu W.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques | Wang H.,Qufu Normal University | And 5 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2014

In order to make quantitative analysis to the accuracy crystal thickness in the birefringent filters, based on the fundamental filter theory, by introducing the birefringent dispersion of crystal, the exact relationship of crystal thickness accuracy, phase retarder deviation and spectrum shift is built up. Theoretical analysis and simulation are put forward strictly. The results show that the birefringent dispersion cannot be neglected when using LiNbO3 as the materials of plates and that the crystal thickness accuracy can ensure a good transmission spectrum, which may be useful for constructing high-performance birefringent filer. ©, 2014, Science Press. All right reserved. Source


Xue Y.,CAS Shanghai Institute of Optics and fine Mechanics | Xue Y.,Shanghai Key Laboratory of All Solid state Laser and Applied Techniques | Xue Y.,University of Chinese Academy of Sciences | He B.,CAS Shanghai Institute of Optics and fine Mechanics | And 12 more authors.
Chinese Optics Letters | Year: 2012

Array size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phase error are calculated. The Strehl ratio is found to be near 100% for arrays with less than 5 fibers, but decreases significantly for larger arrays. These results are in good agreement with the recent experimental results. © 2012 Chinese Optics Letters. Source

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