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Open Access Publications from the University of California

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.

© 2016 SPIE. 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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