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Multiphoton absorption in $CsLiB_6O_10$ with femtosecond infrared laser pulses

Reddy, Babu JN and Naik, VB and Elizabeth, Suja and Bhatt, HL and Venkatram, N and Rao, Narayana D (2008) Multiphoton absorption in $CsLiB_6O_10$ with femtosecond infrared laser pulses. In: Journal of Applied Physics, 104 (5). 053108-1.

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Abstract

Nonlinear absorption and refraction characteristics of cesium lithium borate (CsLiB6O10) crystal have been studied using Z-scan technique. Ti:sapphire laser with 110 fs pulse width operating at 800 nm wavelength and pulse repetition rate of 1 kHz is used as the source of photons. Intensity of the laser pulse is varied from 0.541 to 1.283 TW/cm(2) to estimate the intensity dependence of multiphoton absorption coefficients. Using the theory of multiphoton absorption proposed by Sutherland [Handbook of Nonlinear Optics, in 2nd ed., edited by D. G. McLean and S. Kirkpatrick, Dekker, New York (2003)], found that open aperture Z-scan data fit well for the five-photon absorption (5PA) process. 5PA coefficients are obtained by fitting the expressions into the open aperture experimental data for various peak intensities (I-00). The nonlinear refractive index 172 estimated from closed aperture Z-scan experiment is 1.075 X 10(-4) cm(2)/T W at an input peak intensity of 0.723 T W/cm(2). The above experiment when repeated with a 532 nm, 6 ns pulsed laser led to an irreversible damage of the sample resulting in an asymmetric open aperture Z-scan profile. This indicates that it is not possible to observe multiphoton absorption in this regime of pulse width using 532 urn laser. (c) 2008 American Institute of Physics.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to American Institute of Physics
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 31 Dec 2008 07:31
Last Modified: 19 Sep 2010 04:51
URI: http://eprints.iisc.ernet.in/id/eprint/16409

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