[1] [1] He G S, Yuan L X, Cui Y P. Studies of two-photon pumped frequency-upconverted lasing properties of a new dye material.J Appl Phys,1997,81(6):2529～2537

[2] [2] He G S,Signorini R, Prasad P N. Two-photon pumped frequency-upconverted blue lasing in coumarin dye solution.Appl Opt, 1998,37(24): 5720～5726

[3] [3] Wang D,Zhou G Y, Xu X G,et al .Nonlinear absorption and upconversion properties of two-photon absorption dye: ASPI.Optics & Laser Technology,2002,34(1):55～58

[5] [5] He G S,.Markowicz P P. Observation of stimulated emission by direct three-photon excitation. Nature,2002,415(14): 767～770

[9] [9] He G S,Xu G C.Two-photon absorption and optical-limiting properties of novel organic compounds.Optics Letters, 1995,20(5): 435～437

[10] [10] He G S,Yuan L X,Chen N. Nonlinear optical properties of a new chromophore. J Opt Soc Am,1997,14(5): 1079～1086

[11] [11] Mansoor Sheik-Bahae, Said A A,Tai-Huei Wei, et al.Sensitive measurement of optical nonlinearities using a single beam. IEEE J Quantum Electron,1990,26(4):760～769