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Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal

Major, Arkady and Aitchison, J.S. and Smith, Peter W.E. and Langford, Nigel and Ferguson, Allister I. (2004) Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal. Optics Letters, 29 (24). pp. 2896-2898. ISSN 0146-9592

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Abstract

We report on the systematic open-aperture Z-scan characterization of the two-photon absorption properties in one of the most efficient solid-state Raman frequency shifters, the crystal potassium gadolinium tungstate [KGd(WO4)2]. The two-photon absorption coefficient was determined in the 370-600-nm wavelength range, with the highest value found to be ~1.9 cm/GW at 370 nm. Nonlinear losses are crucial in determining the conversion efficiency of the stimulated Raman scattering process when it is excited with ultrashort laser pulses with photon energy exceeding half of the bandgap. In addition, the results were analyzed within the context of a simple two-parabolic-band theoretical model to yield an effective bandgap energy value for the crystal.

Item type: Article
ID code: 2883
Keywords: multiphoton processes, optical nonlinearities of condensed matter, Raman effect, optics, photonics, Optics. Light, Atomic and Molecular Physics, and Optics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Mr Derek Boyle
    Date Deposited: 06 Feb 2007
    Last modified: 04 Sep 2014 12:54
    URI: http://strathprints.strath.ac.uk/id/eprint/2883

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