The study on Supercontinuum Generation of Femtosecond Pulse Propagating in Fused Silica
YANG Li-ling1,FENG Guo-ying1，2*,YANG Hao1,ZHOU Guo-rui1,ZHOU Hao1,SUI Zhan2,ZHU Qi-hua2
1. College of Electronics & Information Engineering, Sichuan University, Chengdu 610064, China 2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, China
Abstract：Starting from Nonlinear Schrodinger’s equation and using the split-step Fourier method, the authors studied the characters of the supercontinuum generation of femtosecond laser pulse propagating in fused silica, and many physical factors were included such as propagation distance, input pulse peak power, diffraction effect, dispersion effect andnonlinear effect etc. The results show that when the femtosecond pulse propagated inside the fused silica, the process of supercontinuum generation could be divided into two main stages: the pulse compression stage, which was induced by the self-focus and other third nonlinear effects of the fused silica; and the pulse split stage, which was caused by the self-phase modulation and the group velocity dispersion of the fused silica. When the femtosecond pulse propagated inside the fused silica with high input peak power, the 3rd-order nonlinear effect of material induced pulse compression and then the subpulses were produced, so that new frequency components were introduced. At the same time, the authors also studied the spectral distribution of the pulse at different spacial locations, and there are new frequencies around the central frequency. Finally, some experiments were done to demonstrate the supercontinuum generation.
[1] Alfano R R. The Superconrinuum Laser Source: Fundamentals with Updated References. New York: Springer-Verlag, 1989. [2] Alfano R R, Shapiro S L. Phys. Rev. Lett., 1970, 24(11): 584. [3] CHENG Chun-fu, WANG Xiao-fang, LU Bo(成纯富, 王晓方, 鲁 波). Acta Physica Sinica(物理学报), 2004, 53(6): 1826. [4] ZHAO Fu-tan，CHEN Jin-jun, SU Xi-an(赵福潭, 陈进军, 苏锡安). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 1995, 15(2): 1. [5] Corkum P B, Rolland C, Srinivasan-Rao T. Phys. Rev. Lett., 1986, 57(18): 2268. [6] Wu Z, Jiang H, Luo J, et al. Opt. Lett., 2002, 27(6): 448. [7] Chin S L, Hosseini S A, Liu W, et al. Can. J. Phys., 2005, 83: 863. [8] ZHANG Wei-li, ZHANG Ruo-bing, WANG Qing-yue(张伟力，张若兵，王清月). Acta Physica Sinica(物理学报)，1993, 42(12): 1938. [9] Akozbek N, Scalora M, Bowden C M, et al. Opt. Commun., 2001, 191: 353. [10] Yablonovitch E and Bloembergen N. Phys. Rev. Lett., 1972, 29(13): 865. [11] Brodeur A, Chin S L. Phys. Rev. Letts., 1998, 80(20): 4406. [12] Gaeta A L. Phys. Rev. Lett., 2000, 84: 3582. [13] YANG G, SHEN Y R. Optics Letters, 1984, 9(11): 510. [14] Corkum P B, Rolland C. IEEE Journal of Quantum Electronics, 1989, 25(12): 2634. [15] Le Blanc S, Sauerbrey R, Rae S, et al. Journal of the Optical Society of America B, 1993, 10(10): 1801. [16] Kandidov V P, Kosareva O G. Appl. Phys. B, 2003, 77: 149. [17] Tate J, Schumacher D W. Appl. Phys. B, 2002, 74(6): 57. [18] CHEN Xiao-wei, ZHU Yi, LIU Jun(陈晓伟，朱 毅，刘 军). Acta Physica Sinica(物理学报), 2005, 54(11): 5178. [19] JIA Ya-qing, YAN Pei-guang, Lü Ke-cheng(贾亚青，闫培光，吕可诚). Acta Physica Sinica(物理学报), 2006, 55(4): 1809. [20] Couairon A, Tzortxakis S, Bergé L, et al. J. Opt. Soc. Am. B, 2002, 19(5): 1117.
