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Proceedings Paper

Narrow-linewidth ultra-broadband terahertz sources based on difference-frequency generation in mid-infrared quantum cascade lasers
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Paper Abstract

We discuss novel approaches to improve the tuning bandwidth and power output of terahertz (THz) sources based on difference-frequency generation (DFG) in mid-infrared quantum cascade lasers (QCLs). Using a double Littrow external-cavity system, we experimentally demonstrate that both doubly-resonant terms and optical rectification terms in the expression for the intersubband optical nonlinearity contribute to THz generation in DFG-QCLs and report THz DFG-QCLs with the optimized optical rectification terms. We also demonstrate a hybrid DFG-QCL device on silicon that enables significant improvement on THz out-coupling efficiency and results in more than 5 times higher THz output power compared to that of a reference device on its native semi-insulating InP substrate. Finally, we report for the first time the THz emission linewidth of a free-running continuous-wave THz DFG-QCL.

Paper Details

Date Published: 20 February 2017
PDF: 8 pages
Proc. SPIE 10123, Novel In-Plane Semiconductor Lasers XVI, 1012315 (20 February 2017); doi: 10.1117/12.2256099
Show Author Affiliations
Seungyong Jung, The Univ. of Texas at Austin (United States)
Yifan Jiang, The Univ. of Texas at Austin (United States)
Jae Hyun Kim, The Univ. of Texas at Austin (United States)
Luigi Consolino, Lab. Europeo di Spettroscopie Non-Lineari (Italy)
Saverio Bartalini, Lab. Europeo di Spettroscopie Non-Lineari (Italy)
Paolo De Natale, Lab. Europeo di Spettroscopie Non-Lineari (Italy)
Miriam Vitello, Lab. Europeo di Spettroscopie Non-Lineari (Italy)
NEST, CNR-Istituto Nanoscienze and Scuola Normale Superiore (Italy)
Kazuue Fujita, Hamamatsu Photonics K.K. (Japan)
Masahiro Hitaka, Hamamatsu Photonics K.K. (Japan)
Akio Ito, Hamamatsu Photonics K.K. (Japan)
Jeremy Kirch, Univ. of Wisconsin-Madison (United States)
Dan Botez, Univ. of Wisconsin-Madison (United States)
Frederic Demmerle, Walter Schottky Institut (Germany)
Gerhard Boehm, Walter Schottky Institut (Germany)
Markus-Christian Amann, Walter Schottky Institut (Germany)
Mikhail A. Belkin, The Univ. of Texas at Austin (United States)


Published in SPIE Proceedings Vol. 10123:
Novel In-Plane Semiconductor Lasers XVI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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