Abstract
Fast wavelength scanning of an external-cavity quantum cascade laser (EC-QCL) has been developed us- ing a modified Littrow-type cavity configuration. Scan rates up to 5 kHz and tuning ranges up to 7 cm −1 have been real- ized using folded cavity arrangement with a fast piezoac- tuated intracavity mirror to vary the effective diffraction grating angle. High-resolution molecular spectroscopy, lim- ited primarily by the effective laser linewidth, has been demonstrated in pulsed and CW mode using direct absorp- tion 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 devel- oped. The method has been demonstrated by performing high-resolution broadband spectrum of ethylene under at- mospheric and reduced pressures.
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