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Proceedings Paper

Widely-tuned room-temperature terahertz quantum cascade laser sources
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Paper Abstract

We demonstrate room temperature terahertz (THz) quantum cascade laser (QCL) sources with a broad spectral coverage based on intracavity difference-frequency generation. Dual mid-infrared (mid-IR) active cores based on the single-phonon resonance scheme are designed with a THz nonlinearity specially optimized for the high operating fields that correspond to the highest mid-infrared output powers. Integrated dual-period distributed feedback (DFB) gratings with different grating periods are used to purify and tune the mid-IR and THz spectra. Two different phase matching schemes are used for THz generation. The first is the collinear modal phase matching scheme, wherein the wafer is grown on a n+ InP substrate. Room temperature single mode operation THz emission with frequency tuning range from 3.3 to 4.6 THz and THz power up to 65 mW at 4.0 THz are realized. The mid-IR to THz power conversion efficiency is 23 uW/W2. The second is the Čerenkov phase-matching scheme, wherein the wafer is grown on a semi-insulating InP substrate, and device’s facet is polished into 20-30 degrees for THz extraction. Room temperature single mode emissions from 1.0 to 4.6 THz with a side-mode suppression ratio and output power up to 40 dB and 32 µW are obtained, respectively. The mid-IR to THz power conversion efficiency is 50 uW/W2.

Paper Details

Date Published: 4 February 2013
PDF: 7 pages
Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 863108 (4 February 2013); doi: 10.1117/12.2019101
Show Author Affiliations
Quan-Yong Lu, Northwestern Univ. (United States)
Neelanjan Bandyopadhyay, Northwestern Univ. (United States)
Steven Slivken, Northwestern Univ. (United States)
Yanbo Bai, Northwestern Univ. (United States)
Manijeh Razeghi, Northwestern Univ. (United States)


Published in SPIE Proceedings Vol. 8631:
Quantum Sensing and Nanophotonic Devices X
Manijeh Razeghi, Editor(s)

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