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Title: Observation of three-photon absorption and saturation of two-photon absorption in amorphous nanolayered Se/As2S3 thin film structures
Authors: Adarsh, K.V.
Sangunni, K.S.
Suchand Sandeep, C.S.
Philip, Reji
Kokenyesi, S.
Takats, V.
Issue Date: Jul-2007
Publisher: American Institute of Physics
Citation: Journal of Applied Physics, 2007, Vol. 102, 026102
Abstract: 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 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.
Description: Open Access
ISSN: E-ISSN: 1089-7550
P-ISSN(s): 0021-8979; 0148-6349
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Copyright: 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:Research Papers (LAMP)

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