Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region

Kazuue Fujita; Masahiro Hitaka; Akio Ito; Tadataka Edamura; Masamichi Yamanishi; Seungyong Jung; Mikhail A. Belkin

doi:10.1063/1.4923203

Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region

Kazuue Fujita, Masahiro Hitaka, Akio Ito, Tadataka Edamura, Masamichi Yamanishi, Seungyong Jung, Mikhail A. Belkin

Research output: Contribution to journal › Article › peer-review

56 Scopus citations

Abstract

We report the performance of room temperature terahertz sources based on intracavity difference-frequency generation in mid-infrared quantum cascade lasers with a dual-upper-state (DAU) active region. DAU active region design is theoretically expected to produce larger optical nonlinearity for terahertz difference-frequency generation, compared to the active region designs of the bound-to-continuum type used previously. Fabricated buried heterostructure devices with a two-section buried distributed feedback grating and the waveguide designed for Cherenkov difference-frequency phase-matching scheme operate in two single-mode mid-infrared wavelengths at 10.7 μm and 9.7 μm and produce terahertz output at 2.9 THz with mid-infrared to terahertz conversion efficiency of 0.8 mW/W² at room temperature.

Original language	English
Article number	251104
Journal	Applied Physics Letters
Volume	106
Issue number	25
DOIs	https://doi.org/10.1063/1.4923203
State	Published - 22 Jun 2015
Externally published	Yes

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abstract = "We report the performance of room temperature terahertz sources based on intracavity difference-frequency generation in mid-infrared quantum cascade lasers with a dual-upper-state (DAU) active region. DAU active region design is theoretically expected to produce larger optical nonlinearity for terahertz difference-frequency generation, compared to the active region designs of the bound-to-continuum type used previously. Fabricated buried heterostructure devices with a two-section buried distributed feedback grating and the waveguide designed for Cherenkov difference-frequency phase-matching scheme operate in two single-mode mid-infrared wavelengths at 10.7 μm and 9.7 μm and produce terahertz output at 2.9 THz with mid-infrared to terahertz conversion efficiency of 0.8 mW/W2 at room temperature.",

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AU - Fujita, Kazuue

AU - Hitaka, Masahiro

AU - Ito, Akio

AU - Edamura, Tadataka

AU - Yamanishi, Masamichi

AU - Jung, Seungyong

AU - Belkin, Mikhail A.

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AB - We report the performance of room temperature terahertz sources based on intracavity difference-frequency generation in mid-infrared quantum cascade lasers with a dual-upper-state (DAU) active region. DAU active region design is theoretically expected to produce larger optical nonlinearity for terahertz difference-frequency generation, compared to the active region designs of the bound-to-continuum type used previously. Fabricated buried heterostructure devices with a two-section buried distributed feedback grating and the waveguide designed for Cherenkov difference-frequency phase-matching scheme operate in two single-mode mid-infrared wavelengths at 10.7 μm and 9.7 μm and produce terahertz output at 2.9 THz with mid-infrared to terahertz conversion efficiency of 0.8 mW/W2 at room temperature.

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Terahertz generation in mid-infrared quantum cascade lasers with a dual-upper-state active region

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