External-cavity quantum cascade lasers with fast wavelength scanning

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Fast wavelength scanning of an external-cavity quantum cascade laser (EC-QCL) has been developed using a modified Littrow-type cavity configuration. Scan rates up to 5 kHz and tuning ranges up to 7 cm-1 have been realized using folded cavity arrangement with a fast piezoactuated intracavity mirror to vary the effective diffraction grating angle. High-resolution molecular spectroscopy, limited primarily by the effective laser linewidth, has been demonstrated in pulsed and CW mode using direct absorption spectroscopy of ammonia and ethylene in the 10-μm wavelength region. A high-resolution broadband spectral scan employing mode-hop-free tuning of a set of discrete laser modes within the fast frequency scan has been developed. The method has been demonstrated by performing high-resolution broadband spectrum of ethylene under atmospheric and reduced pressures.

Original languageEnglish (US)
Pages (from-to)243-251
Number of pages9
JournalApplied Physics B: Lasers and Optics
Issue number2
StatePublished - Aug 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy


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