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Proceedings Paper

Review of high power frequency comb sources based on InP: from MIR to THz at CQD
Author(s): Manijeh Razeghi; Quanyong Lu; Donghai Wu; Steven Slivken
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Paper Abstract

We present the recent development of high performance compact frequency comb sources based on mid-infrared quantum cascade lasers. Significant performance improvements of our frequency combs with respect to the continuous wave power output, spectral bandwidth, and beatnote linewidth are achieved by systematic optimization of the device's active region, group velocity dispersion, and waveguide design. To date, we have demonstrated the most efficient, high power frequency comb operation from a free-running room temperature continuous wave (RT CW) dispersion engineered QCL atλ ~5-9μm. In terms of bandwidth, the comb covered a broad spectral range of 120 cm-1 with a radio-frequency intermode beatnote spectral linewidth of 40 Hz and a total power output of 880 mW at 8 μm and 1 W at λ~5.0μm. The developing characteristics show the potential for fast detection of various gas molecules. Furthermore, THz comb sources based on difference frequency generation in a mid-IR QCL combs could be potentially developed.

Paper Details

Date Published: 14 September 2018
PDF: 10 pages
Proc. SPIE 10756, Terahertz Emitters, Receivers, and Applications IX, 107560I (14 September 2018); doi: 10.1117/12.2326358
Show Author Affiliations
Manijeh Razeghi, Northwestern Univ. (United States)
Quanyong Lu, Northwestern Univ. (United States)
Donghai Wu, Northwestern Univ. (United States)
Steven Slivken, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 10756:
Terahertz Emitters, Receivers, and Applications IX
Manijeh Razeghi; Alexei N. Baranov, Editor(s)

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