Broadly tunable terahertz difference-frequency generation in quantum cascade lasers on silicon

Seungyong Jung; Jae Hyun Kim; Yifan Jiang; Karun Vijayraghavan; Mikhail A. Belkin

doi:10.1117/1.OE.57.1.011020

26 October 2017 Broadly tunable terahertz difference-frequency generation in quantum cascade lasers on silicon

Seungyong Jung, Jae Hyun Kim, Yifan Jiang, Karun Vijayraghavan, Mikhail A. Belkin

Author Affiliations +

Optical Engineering, Vol. 57, Issue 1, 011020 (October 2017). https://doi.org/10.1117/1.OE.57.1.011020

Abstract

We report broadly tunable terahertz (THz) sources based on intracavity Cherenkov difference-frequency generation in quantum cascade lasers transfer-printed on high-resistivity silicon substrates. Spectral tuning from 1.3 to 4.3 THz was obtained from a 2-mm long laser chip using a modified Littrow external cavity setup. The THz power output and the midinfrared-to-THz conversion efficiency of the devices transferred on silicon are dramatically enhanced, compared with the devices on a native semi-insulating InP substrate. Enhancement is particularly significant at higher THz frequencies, where the tail of the Reststrahlen band results in a strong absorption of THz light in the InP substrate.

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Seungyong Jung, Jae Hyun Kim, Yifan Jiang, Karun Vijayraghavan, and Mikhail A. Belkin "Broadly tunable terahertz difference-frequency generation in quantum cascade lasers on silicon," Optical Engineering 57(1), 011020 (26 October 2017). https://doi.org/10.1117/1.OE.57.1.011020

Received: 20 June 2017; Accepted: 28 September 2017; Published: 26 October 2017

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