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Influence of two photon absorption induced free carriers on coherent polariton and phonon generation in ZnTe crystals

Kamaraju, N and Kumar, Sunil and Freysz, Eric and Sood, AK (2010) Influence of two photon absorption induced free carriers on coherent polariton and phonon generation in ZnTe crystals. In: Journal of Applied Physics, 107 (10). p. 103102.

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Abstract

Combination of femtosecond Kerr, two photon absorption, and impulsive stimulated Raman scattering (ISRS) experiments have been carried out to investigate the effect of pulse energy and crystal temperature on the generation of coherent polaritons and phonons in 〈110〉 cut ZnTe single crystals of three different resistivities. We demonstrate that the effect of two photon induced free carriers on the creation of both the polaritons and phonons is largest at 4 K where the free carrier lifetime is enhanced. The temperature dependant ISRS on high and low purity ZnTe crystals allows us to unambiguously assign the phonon mode at 3.5 THz to the longitudinal acoustic mode at X-point in the Brillouin zone, LA(X).

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 Feb 2012 11:17
Last Modified: 27 Feb 2012 11:17
URI: http://eprints.iisc.ernet.in/id/eprint/42993

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