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Spectral broadening of mid-infrared femtosecond pulses in GaAs

Source: Opt. Lett. 34, 3839 (2010); doi:10.1364/OL.34.003839

Published 2009-11-12

KEYWORDS and PACS
Keywords
PACS
  • 42.70.Km
    Infrared transmitting materials
  • 42.70.Mp
    Nonlinear optical crystals
  • 42.65.Re
    Ultrafast processes; optical pulse generation and pulse compression
  • 78.20.Ci
    Optical constants
  • 78.30.Fs
    Infrared and Raman spectra in III-V and II-VI semiconductors
  • 42.65.Jx
    Beam trapping, optical self-focusing and defocusing
  • YEAR: 2010
PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef OSA
S. Ashihara1,2 and Y. Kawahara1
1Department of Applied Physics, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588 Japan
2PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 Japan
We achieved efficient spectral broadening for mid-IR pulses of few-microjoule energy. The spectral bandwidth of the femtosecond pulses at the center wavelength of 5000 nm increased from 540 nm  to  2060 nm (from 220  to  910 cm−1 in frequency) by nonlinear propagation in a gallium arsenide single crystal. The spectral broadening was accompanied by nonlinear absorption loss of 25%. The demonstrated scheme should be available at any operation wavelength within the material transparency range and provides a useful tool in nonlinear vibrational spectroscopy. ©2009 Optical Society of America

(As supplied by publisher.)

History: Received 4 August 2009; revised 22 October 2009; accepted 28 October 2009; published 2009-11-12
Permalink: http://dx.doi.org/10.1364/OL.34.003839

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