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Proceedings Paper

Low power-consumption quantum cascade lasers
Author(s): Tsukuru Katsuyama; Jun-ichi Hashimoto; Hiroyuki Yoshinaga; Hiroki Mori; Yukihiro Tsuji; Makoto Murata; Mitsuru Ekawa; Toshiyuki Tanahashi
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Paper Abstract

Quantum cascade lasers (QCLs) are promising light sources for real time high-sensitivity gas sensing in the mid-infrared region. For the practical use of QCLs as a compact and portable gas sensor, their power-consumption needs to be reduced. We report a successful operation of a low power-consumption distributed feedback (DFB) QCL. For the reduction of power consumption, we introduced a vertical-transition structure in a core region to improve carrier transition efficiency and reduced the core volume. DFB-QCL epitaxial structure was grown by low-pressure OMVPE. The core region consists of AlInAs/GaInAs superlattices lattice-matched to InP. A first-order Bragg-grating was formed near the core region to obtain a large coupling coefficiency. A mesa-strip was formed by reactive ion etching and a buried-heterostructure was fabricated by the regrowth of semi-insulating InP. High-reflective facet coatings were also performed to decrease the mirror loss for the reduction of the threshold current. A device (5x500μm) operated with a single mode in the wavelength region from 7.23μm to 7.27μm. The threshold current and threshold voltage under CW operation at 20 °C were 52mA and 8.4V respectively. A very low threshold power-consumption as low as 0.44 W was achieved, which is among the lowest values at room temperature to our knowledge.

Paper Details

Date Published: 8 February 2015
PDF: 6 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93700F (8 February 2015); doi: 10.1117/12.2077523
Show Author Affiliations
Tsukuru Katsuyama, Sumitomo Electric Industries, Ltd. (Japan)
Jun-ichi Hashimoto, Sumitomo Electric Industries, Ltd. (Japan)
Hiroyuki Yoshinaga, Sumitomo Electric Industries, Ltd. (Japan)
Hiroki Mori, Sumitomo Electric Industries, Ltd. (Japan)
Yukihiro Tsuji, Sumitomo Electric Industries, Ltd. (Japan)
Makoto Murata, Sumitomo Electric Industries, Ltd. (Japan)
Mitsuru Ekawa, Sumitomo Electric Industries, Ltd. (Japan)
Toshiyuki Tanahashi, Sumitomo Electric Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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