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Journal of Applied Physics / Volume 107 / Issue 10 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 107, 103102 (2010); http://dx.doi.org/10.1063/1.3391445 (5 pages)

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

N. Kamaraju1,2, Sunil Kumar1,2, Eric Freysz3, and A. K. Sood1,2

1Department of Physics, Indian Institute of Science, Bangalore 560012, India
2Centre for Ultrafast Laser Applications, Indian Institute of Science, Bangalore 560012, India
3CPMOH, UMR CNRS 5798, Universite de Bordeaux I, 351 Cours de la Liberation, 33405 Talence Cedex, France

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(Received 7 December 2009; accepted 17 March 2010; published online 18 May 2010)

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).

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL DETAILS
  3. RESULTS
    1. Influence of temperature and pump intensity on the generation of coherent polaritons
    2. Measure of TPA (β)
    3. Influence of temperature and pump intensity on the generation of coherent phonons
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

Brillouin zones, carrier lifetime, electro-optical effects, high-speed optical techniques, II-VI semiconductors, optical Kerr effect, phonon spectra, polaritons, stimulated Raman scattering, two-photon processes, wide band gap semiconductors, zinc compounds

PACS

  • 72.20.Jv

    Charge carriers: generation, recombination, lifetime, and trapping

  • 63.20.D-

    Phonon states and bands, normal modes, and phonon dispersion

  • 78.47.je

    Time resolved light scattering spectroscopy

  • 71.36.+c

    Polaritons (including photon-phonon and photon-magnon interactions)

  • 78.20.Jq

    Electro-optical effects

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3391445

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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