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26 August 2022 Terahertz quantum-cascade VECSELs local oscillators for heterodyne receivers
Christopher A. Curwen, Jonathan H. Kawamura, Darren J. Hayton, Yu Wu, Sadhvikas J. Addamane, John L. Reno, Benjamin S. Williams, Boris S. Karasik
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Proceedings Volume PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; PC121900A (2022) https://doi.org/10.1117/12.2629058
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
We present recent progress in developing THz QC-VECSELs for use as local oscillators for heterodyne receivers in the 2-5 THz frequency range. The QC-VECSEL is a recently developed external cavity configuration for making THz quantum-cascade lasers (QCLs) with high power, excellent beam quality, and broadband frequency tunability. We discuss electrical frequency tuning characteristics of the QC-VECSEL, sources of noise in the free-running output frequency, and phase-locking to a stable microwave reference (subharmonic diode mixer). We also discuss progress in increasing operating temperature and reducing power consumption of the QC-VECSEL by means of reducing the thickness of the QC-gain material.
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Christopher A. Curwen, Jonathan H. Kawamura, Darren J. Hayton, Yu Wu, Sadhvikas J. Addamane, John L. Reno, Benjamin S. Williams, and Boris S. Karasik "Terahertz quantum-cascade VECSELs local oscillators for heterodyne receivers", Proc. SPIE PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, PC121900A (26 August 2022); https://doi.org/10.1117/12.2629058
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KEYWORDS
Heterodyning
Oscillators
Receivers
Terahertz radiation
Microwave radiation
Mode locking
Observatories
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