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THz QCLs for heterodyne receivers and wavelength modulation spectroscopy

  • Author(s): Lee, AWM;
  • Kao, TY;
  • Zimmerman, IA;
  • Cole, WTS;
  • Thurston, R;
  • Saykally, RJ;
  • Han, N;
  • Hu, Q
  • et al.
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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