[6] [6] Soileau M J. Passive intensity limiter based on nonlinear optics [J]. J. Opt. Soc. Am. A,1980,70:1051

[7] [7] Bunning T J,Natarajan L V,Schmitt M G et al. Optical limiting in solutions of diphenyl polyenes [J]. Appl. Opt.,1991,30(30): 4341

[8] [8] Van Stryland E V,Wu Y Y,Hagan D J et al. Optical limiting with semiconductors [J]. J. Opt. Soc. Am. B,1988,5:1980

[9] [9] Woods G L,Clark W W,Miller M J et al. Evaluation of passive optical limiters and switches [J]. SPIE Proc.,1989,1105:154

[10] [10] Tutt L W,Kost A. Optical limiting performance of C60 and C70 solutions [J]. Nature,1992,356:225

[12] [12] Sheik-Bahae M,Said A A,Van Stryland E V. High sensitivity single beam n2 measurements [J]. Opt. Lett.,1989,14:955

[13] [13] Sheik-Bahae M,Said A A,Wei T H et al. Sensitive measurement of optical nonlinearities using a single beam [J].IEEE. J. Quantum Electron.,1990,26(4): 760

[16] [16] Marburger J H. Self-focusing theory [J]. Pro. Quantum Electron.,1975,4:35