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

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

56 Zitate (Scopus)

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.

OriginalspracheEnglisch
Aufsatznummer251104
FachzeitschriftApplied Physics Letters
Jahrgang106
Ausgabenummer25
DOIs
PublikationsstatusVeröffentlicht - 22 Juni 2015
Extern publiziertJa

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