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Proceedings Paper

Frequency tuning of THz quantum cascade lasers
Author(s): Xifeng Qian; Andriy A. Danylov; Alexander R. Light; Jerry Waldman; Neal Erickson
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Paper Abstract

This paper introduces the continuously tunable THz radiation through sideband generation of a free running and solidnitrogen- cooled THz quantum cascade laser. The 2.324 THz QCL operating in a single longitudinal mode (SLM) in continuous-wave (cw) was mixed with a swept synthesized microwave signal by a THz Schottky-diode-balanced mixer. Through sideband generation, two frequency branches were observed at low and high frequency, characterized with a Fourier-transform spectrometer. At low frequency, the sideband generates frequencies from -50 GHz to +50 GHz. At high frequency, it generates sideband frequencies from 70 GHz to 115 GHz. The total ±100 GHz tuning range can be further expanded with higher frequency millimeter wave amplifier/multiplier source. The sideband generates total 1 μW of output power at both upper and lower frequency with 200 μW of driven power from the THz QCL, showing a power conversion efficiency of 5 × 10-3. The demonstration of this SM, continuously tunable THz source enables its applications where SM, spatially coherent beam is required.

Paper Details

Date Published: 14 March 2015
PDF: 6 pages
Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 93620U (14 March 2015); doi: 10.1117/12.2175696
Show Author Affiliations
Xifeng Qian, Univ. of Massachusetts Lowell (United States)
Andriy A. Danylov, Univ. of Massachusetts Lowell (United States)
Alexander R. Light, Univ. of Massachusetts Lowell (United States)
Jerry Waldman, Univ. of Massachusetts Lowell (United States)
Neal Erickson, Univ. of Massachusetts Amherst (United States)

Published in SPIE Proceedings Vol. 9362:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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