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

被引：14
作者：
Adarsh, K. V.
Sangunni, K. S. [1 ]
Sandeep, C. S. Suchand
Philip, Reji
Kokenyesi, S.
Takats, V.
机构：
[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India
[2] Raman Res Inst, Bangalore 560080, Karnataka, India
[3] Univ Debrecen, Dept Expt Phys, H-4026 Debrecen, Hungary
来源：
JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 02期
基金：
匈牙利科学研究基金会;
关键词：
D O I：
10.1063/1.2753581
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied the nonlinear optical properties of nanolayered Se/As2S3 film with a modulation period of 10 nm and a total thickness of 1.15 mu m 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. (c) 2007 American Institute of Physics.
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