Broadly tunable terahertz generation in mid-infrared quantum cascade lasers

Karun Vijayraghavan, Yifan Jiang, Min Jang, Aiting Jiang, Karthik Choutagunta, Augustinas Vizbaras, Frederic Demmerle, Gerhard Boehm, Markus C. Amann and Mikhail A. Belkin ()
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Karun Vijayraghavan: Mircroelectronics Research Center, The University of Texas at Austin
Yifan Jiang: Mircroelectronics Research Center, The University of Texas at Austin
Min Jang: Mircroelectronics Research Center, The University of Texas at Austin
Aiting Jiang: Mircroelectronics Research Center, The University of Texas at Austin
Karthik Choutagunta: Mircroelectronics Research Center, The University of Texas at Austin
Augustinas Vizbaras: Walter Schottky Institut, Technische Universität München
Frederic Demmerle: Walter Schottky Institut, Technische Universität München
Gerhard Boehm: Walter Schottky Institut, Technische Universität München
Markus C. Amann: Walter Schottky Institut, Technische Universität München
Mikhail A. Belkin: Mircroelectronics Research Center, The University of Texas at Austin

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Room temperature, broadly tunable, electrically pumped semiconductor sources in the terahertz spectral range, similar in operation simplicity to diode lasers, are highly desired for applications. An emerging technology in this area are sources based on intracavity difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers. Here we report terahertz quantum cascade laser sources based on an optimized non-collinear Cherenkov difference-frequency generation scheme that demonstrates dramatic improvements in performance. Devices emitting at 4 THz display a mid-infrared-to-terahertz conversion efficiency in excess of 0.6 mW W−2 and provide nearly 0.12 mW of peak power output. Devices emitting at 2 and 3 THz fabricated on the same chip display 0.09 and 0.4 mW W−2 conversion efficiencies at room temperature, respectively. High terahertz-generation efficiency and relaxed phase-matching conditions offered by the Cherenkov scheme allowed us to demonstrate, for the first time, an external-cavity terahertz quantum cascade laser source tunable between 1.70 and 5.25 THz.

Date: 2013
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DOI: 10.1038/ncomms3021

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