Z-scan theory of two-photon absorption saturation and experimental evidence

被引:80
作者
Gu, Bing
Fan, Ya-Xian
Chen, Jing
Wang, Hui-Tian [1 ]
He, Jun
Ji, Wei
机构
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
[3] Nanjing Normal Univ, Sch Phys Sci & Technol, Nanjing 210097, Peoples R China
[4] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
基金
中国国家自然科学基金;
关键词
D O I
10.1063/1.2795997
中图分类号
O59 [应用物理学];
学科分类号
摘要
In our article [B. Gu, Y. X. Fan, J. Wang, J. Chen, J. P. Ding, H. T. Wang, and B. Guo, Phys. Rev. A 73, 065803 (2006)] we have presented the theory of open-aperture Gaussian-beam Z-scan, based on the Adomian decomposition method, which is available only for the saturable absorption caused by single-photon absorption transition. In the present article, using the same technique (Adomian decomposition method, as a common technique), we develop an open-aperture Z-scan theory for evaluating the property of the saturable absorption originating from two-photon absorption (2PA) transition, when a spatial Gaussian beam is used as the excitation source. We find analytic polynomial expressions of the Z-scan traces for a continuous wave laser or a temporal Gaussian pulsed laser. As the experimental evidence, we investigate the saturable 2PA behaviors caused by the interband two-photon transition in the direct-gap II-VI semiconductors CdS, CdSe, ZnSe, and ZnTe, under the excitation condition of a femtosecond laser with a 140 fs pulse duration, a 1 kHz low repetition rate, and a 1.6 eV photon energy. (C) 2007 American Institute of Physics.
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页数:5
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