[1] [1] Wei R X,Jiang D S. Chinese Journal of Lasers,2003,23(6): 551～554

[2] [2] Deng G A,Cai Z A,Zhang Y H,et al. Acta Optica Sinica,2004,24(1): 99～103

[3] [3] Yang G C. Acta Photonica Sinica,1996,25(7): 644～648

[4] [4] Fu X,Gao Y Y. Acta Photonica Sinica,1999,28(6): 570～574

[5] [5] Jin Q L,Ke J H. Laboratory Research and Exploration,2002,21(3): 52～54

[6] [6] Wang Z Y,Yu Z H,Fan Y B. Journal of Qingdao University,1998,13(1): 24～29