External-cavity quantum cascade lasers with fast wavelength scanning |
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Authors: | T Tsai G Wysocki |
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Institution: | 1. Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA
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Abstract: | 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. |
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