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

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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 (http://dx.doi.org/10.1364/OL.29.002896)

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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.

ORCID iDs

Major, Arkady, Aitchison, J.S., Smith, Peter W.E., Langford, Nigel ORCID logoORCID: https://orcid.org/0000-0002-3830-5542 and Ferguson, Allister I.;
  • Item type:Article
    ID code:2883
    Dates:
    Date
    Event
    December 2004
    Published
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Mr Derek Boyle
    Date deposited:06 Feb 2007
    Last modified:11 Nov 2024 08:28
    URI:https://strathprints.strath.ac.uk/id/eprint/2883
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