Optimization of Broad-Band Flat-Field Holographic Concave Grating without Astigmatism
KONG Peng1,2, TANG Yu-guo1, Bayanheshig1*, LI Wen-hao1, CUI Jin-jiang3
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
Abstract：The desirable imaging locations of the flat-field holographic concave gratings should be in a plane. And the object can be imaged perfectly by the grating when the tangential focal curve and sagittal focal curve both superpose the intersection of the image plane and dispersion plane. But actually, the defocus can not be eliminated over the entire wavelength range, while the astigmatism vanishes when the grating parameters satisfy some conditions. An optimization method for broad-band flat-field holographic concave gratings with absolute astigmatism correction was proposed. The ray tracing software ZEMAX was used for investigating the imaging properties of the grating. And we made a comparison between spectral performance of gratings designed by this new method and that by conventional method, respectively. The results indicated that the spectral performance of gratings designed by using the absolute astigmatism correction method can be as good as gratings designed with the conventional method. And the focusing performance in the sagittal direction is much better, so that the S/N ratio can be greatly improved.
[1] Hayat G S, Flamand J, Lacroix M, et al. Opt. Eng., 1975, 14(5): 420. [2] Lerner J M, Chambers R J, Passereau G. SPIE, 1981, 268: 122. [3] Sokolova E. J. Mod. Opt., 2000, 47: 2377. [4] JI Yi-qun, GONG Guang-biao, ZHU Shan-bing, et al(季轶群，宫广彪，朱善冰，等). Optics and Presion Engineering(光学精密工程), 2009, 17(4): 727. [5] TANG Yu-guo, SONG Nan, Bayanheshig, et al(唐玉国，宋 楠，巴音贺希格，等). Optics and Presion Engineering(光学精密工程), 2010, 18(9): 1989. [6] Beutler H G. J. Opt. Soc. Am., 1945, 35(5): 311. [7] Noda H, Namioka T, Seya M. J. Opt. Soc. Am., 1974, 64: 1031. [8] Palmer C. Appl. Opt., 1989, 28(9): 1605. [9] Pavlycheva N K. Sov. J. Opt. Technol., 1979, 46: 394. [10] McKinney W R, Palmer C. Appl. Opt., 1987, 26: 3108. [11] CHEN Ji-wu, LIN Zhong, MENG Qing-hua(陈吉武，林 中，孟庆华). Optics and Precision Engineering(光学精密工程), 1997, 5(1): 96. [12] LI Chao-ming, WU Jian-hong, ZHAO Yan-jiao, et al(李朝明，吴建宏，赵燕皎，等). Journal of Optoelectronics·Laser(光电子·激光), 2006, 17(7): 828. [13] PI Dao-rui, HUANG Yuan-shen, ZHANG Da-wei, et al(皮道锐，黄元申，张大伟, 等). Acta Physica Sinica(物理学报), 2010, 59(2): 1009. [14] Chrisp M. Appl. Opt., 1983, 22: 1508.
