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Applied Physics Letters / Volume 99 / Issue 22 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 99, 221903 (2011); http://dx.doi.org/10.1063/1.3664218 (3 pages)

Ultrafast decay of high frequency optical phonon mode in KTiOPO4

Shan Yang (杨山)1,2, Sanjay Adhikari2, Manoj Dobbala3, and Feruz Ganikhanov2

1Biomedical Research Center, West Virginia University, West Virginia 26506, USA
2Department of Physics, West Virginia University, West Virginia 26506, USA
3Department of Mechanical Engineering, West Virginia University, West Virginia 26506, USA

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(Received 7 August 2011; accepted 5 November 2011; published online 28 November 2011)

Decay of the strongest optical phonon mode in KTiOPO4 was directly traced using femtosecond coherent anti-Stokes Raman scattering spectroscopy. Dephasing of the Raman active mode at ∼700 cm−1 proceeds with the nonlinear polarization dephasing time of 495 ± 10 fs. The dephasing is solely due to the phonon energy decay with corresponding homogeneous linewidth of 21.4 ± 0.5 cm−1. Low temperature linewidth of 14.7 cm−1 is estimated from our data assuming that down-conversion phonon relaxation process is dominant. Our results can help to understand stimulated Raman generation and oscillation of Stokes wave in laser systems where Raman gain is critically dependent on dephasing time.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

coherent antiStokes Raman scattering, high-speed optical techniques, phonons, potassium compounds, spectral line breadth, titanium compounds

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3664218

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

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

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