Observation of three-photon absorption and saturation of two-photon absorption in amorphous nanolayered Se/As2S3 thin film structures

被引：0
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作者：
Adarsh, K.V. [1 ]
Sangunni, K.S. [1 ]
Sandeep, C. S. Suchand [2 ]
Philip, Reji [2 ]
Kokenyesi, S. [3 ]
Takats, V. [3 ]
机构：
[1] Department of Physics, Indian Institute of Science, Bangalore 560 012, India
[2] Raman Research Institute, Bangalore 560 080, India
[3] Department of Experimental Physics, University of Debrecen, Bem ter 18/a, Debrecen 4026, Hungary
来源：
Journal of Applied Physics | 2007年 / 102卷 / 02期
关键词：
We have studied the nonlinear optical properties of nanolayered Se/ As2 S3 film with a modulation period of 10 nm and a total thickness of 1.15 μm at two [1064 nm (8 ns) and 800 nm (20 ps)] wavelengths using the standard Z -scan technique. Three-photon absorption was observed at off-resonant excitation and saturation of two-photon absorption at quasiresonant excitation. The observation of the saturation of two-photon absorption is because the pulse duration is shorter than the thermalization time of the photocreated carriers in their bands and three-photon absorption is due to high excitation irradiance. © 2007 American Institute of Physics;
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