Photoinduced transparency of effective three-photon absorption coefficient for femtosecond laser pulses in Ge16As29Se55 thin films

Barik, AR and Adarsh, KV and Naik, Ramakanta and Sandeep, Suchand CS and Philip, Reji and Zhao, Donghui and Jain, Himanshu (2011) Photoinduced transparency of effective three-photon absorption coefficient for femtosecond laser pulses in Ge16As29Se55 thin films. In: Applied Physics Letters, 98 (20). pp. 201111-1.

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Abstract

We report a dramatic change in effective three-photon absorption coefficient of amorphous Ge16As29Se55 thin films, when its optical band gap decreases by 10 meV with 532 nm light illumination. This large change provides valuable information on the higher excited states, which are otherwise inaccessible via normal optical absorption. The results also indicate that photodarkening in chalcogenide glasses can serve as an effective tool to tune the multiphoton absorption in a rather simple way. (C) 2011 American Institute of Physics.

Item Type:	Journal Article
Publication:	Applied Physics Letters
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Jun 2011 07:58
Last Modified:	08 Jan 2013 05:33
URI:	http://eprints.iisc.ac.in/id/eprint/38230

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