[1] [1] B. G. Bovard. Rugate filter theory: an overview[J]. Appl. Opt., 1993, 32(28):5427～5442

[2] [2] W. E. Johnson, R. L. Crane. Introduction to rugate filter technology[C]. SPIE,1993, 2046:88～108

[3] [3] H. Yoda, D. Tanaka, O. Hanaizumi et al.. Rugate filters fabricated by a radio frequency magnetron sputtering system by use of an optical in situ monitoring technique[J]. Appl. Opt., 2006, 45(1):184～190

[4] [4] E. P. Donovan, D. Van Vechten, A. D. F. Kahn et al.. Near infrared rugate filter fabrication by ion beam assisted deposition of Si(1-x)Nx films[J]. Appl. Opt., 1989, 28(14):2940～2944

[5] [5] Shen Zicai, Wang Yingjia, Fan Zhengxiu et al.. Analysis of optical characteristics of gradient refractive index coatings prepared by linear co-evaporation[J]. Chinese J. Lasers, 2005, 32(6):829～834

[6] [6] Wang Dan, Xu Xueke, Shen Zicai et al.. Color filter design based on rugate wavelets theory[J]. Acta Optica Sinica, 2006, 26(5):792～796

[7] [7] Li Dawei, Xu Cheng, Zhao Yuan’an et al.. Delamination of optical thin films induced by 1064 nm laser pulse[J]. Chinese J. Lasers, 2008, 35(5):764～767

[8] [8] Cui Yun, Zhao Yuan’an, Jin Yunxia et al.. Laser damage characteristic of third harmonic separator at 1064 nm[J]. Acta Optica Sinica, 2007, 27(6):1129～1134

[9] [9] H. Bartzsch, S. Lange, P. Frach et al.. Graded refractive index layer systems for antireflective coatings and rugate filters deposited by reactive pulse magnetron sputtering[J]. Surf. & Coat. Technol., 2004,180-181:616～620

[10] [10] Deng Hongxiang, Zhu Xiaotao, Zheng Wanguo et al.. Gradient optical film taking the place of classical high-reflectivity film[J]. High Power Laser and Particle Beams, 2007, 19(1):58～62

[11] [11] Yang Jun, Ming Hai, Wang Pei et al.. Application in optical communication of optical films[J]. Optoelectronic Technology & Information, 2003, 16(3):10～14

[12] [12] J. A. Dobrowolski, S. H. C. Piotrowski. Refractive index as a variable in the numerical design of optical thin film systems[J]. Appl. Opt., 1982, 21(8):1502～1509

[13] [13] Ma Xiaofeng, Wang Dan, Liu Dingquan et al.. Design of non-polarizing broadband antireflection coating using equivalent layer[J]. Acta Optica Sinica, 2007, 27(3):563～566

[14] [14] X. Wang, H. Masumoto, Y. Someno et al.. Helicon plasma deposition of a TiO2/SiO2 multilayer optical filter with graded refractive index profiles[J]. Appl. Phys. Lett., 1998, 72(25):3264～3266

[15] [15] X. Wang, H. Masumoto, Y. Someno et al.. Design and preparation of a 33-layer reflection filter of TiO2-SiO2 system[J]. J. Vac. Sci. Technol. A, 2000, 18(3):933～937

[16] [16] Q. M. Song, F. Huang, M. Li et al.. Graded refractive-index SiOx infrared filters prepared by reactive magnetron sputtering[J]. J. Vac. Sci. Technol. A, 2008, 26(2):265～269

[17] [17] F. C. Lai, M. Li, H.Q. Wang et al.. Effect of oxygen flow rate on the properties of SiOx films deposited by reactive magnetron sputtering[J]. Chin. Opt. Lett., 2005, 3(8):490～493

[18] [18] F. C. Lai, M. Li, K. Chen et al.. Substrate temperature effect on the refractive index and a two-step film method to detect small inhomogeneities in optical films[J]. Appl. Opt., 2005, 44(29):6181～6185

[19] [19] Wang Yanzhi, Zhang Weili,Fan Zhengxiu et al.. Analysis for accurately fitting the refractive index of SiO2 thin film[J]. Chinese J. Lasers, 2008, 35(5):760～763

[20] [20] W. H. Southwell, R. L. Hall. Rugate filter sidelobe suppression using quintic and rugated quintic matching layers[J]. Appl. Opt., 1989, 28: 2949～2951

[21] [21] Zhan Yuanling, Qu Huizhong, Zhang Tiequn. Suppression of rugate filter sidelobes[J]. Acta Optica Sinica, 1991, 11(2):172～175