25 May 2016 THz QCLs for heterodyne receivers and wavelength modulation spectroscopy
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Abstract
Milliwatt average power terahertz quantum cascade lasers (THz-QCLs, 2 THz to 5 THz) have been developed for spectroscopy and as local oscillators for heterodyne receivers. Novel DFB THz-QCLs have been fabricated and show single-mode operation. The narrow line widths of <10 MHz and stark shift tuning of of 6 GHz, allows for wavelength modulation spectroscopy of low pressure gasses in the unexplored THz frequency band. The same devices also act as local-oscillators for heterodyne receivers for remote-sensing and astronomy. Lastly we report on improved tunable DFB devices for use in spectroscopy.
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Alan W. M. Lee, Tsung-Yu Kao, Ian A. Zimmerman, William T. S. Cole, Richard Thurston, Richard J. Saykally, Ningren Han, Qing Hu, "THz QCLs for heterodyne receivers and wavelength modulation spectroscopy", Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98362O (25 May 2016); doi: 10.1117/12.2224158; https://doi.org/10.1117/12.2224158
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