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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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|
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