THz QCLs for heterodyne receivers and wavelength modulation spectroscopy

THz QCLs for heterodyne receivers and wavelength modulation spectroscopy

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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 t...

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Bibliographic Details
Main Authors: Lee, Alan W. M., Kao, Tsung-Yu, Zimmerman, Ian A., Cole, William T. S., Thurston, Richard, Saykally, Richard J., Han, Ningren, Hu, Qing
Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Format: Article
Published: SPIE 2018
Online Access:http://hdl.handle.net/1721.1/114515
https://orcid.org/0000-0003-4513-8575
https://orcid.org/0000-0003-1982-4053
Description
Summary: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. Keywords: terahertz quantum cascade laser, spectroscopy, heterodyne

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