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Proceedings Paper

Quantum cascade lasers based on single phonon-continuum depopulation structures
Author(s): Kazuue Fujita; Tadataka Edamura; Naota Akikusa; Atsushi Sugiyama; Takahide Ochiai; Shinichi Furuta; Akio Ito; Masamichi Yamanishi; Hirofumi Kan
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Paper Abstract

We report a high performance operation of quantum cascade lasers based on Single Phonon-Continuum depopulation (SPC) structures. The lasers exhibit low CW threshold current densities and high characteristic temperatures in the wide wavelength range between 4.5 and 10.8 μm. An 8.2 μm laser, despite a bare ridge structure which is extremely simple configuration without any intentional thermal dissipation equipments and any HR coatings, demonstrates the high device performance: a low threshold current density of 1.66 kA/cm2 and a high maximum output power of 76 mW (from one facet) at room temperature in CW operation. Our shortest wavelength 4.5 μm laser with HR coating reveals a low threshold current density of 1.7 kA/cm2 and maximum output power of 161 mW at room temperature in CW operation. For long wavelength, we present the first room temperature, CW operation of DFB QCL with top grating. The DFB laser emits ~9.6 μm single mode spectra at temperatures between -5 °C and 50 °C. The wide tuning range is obtained to be from 1031 to 1039 cm-1.

Paper Details

Date Published: 3 February 2009
PDF: 10 pages
Proc. SPIE 7230, Novel In-Plane Semiconductor Lasers VIII, 723016 (3 February 2009); doi: 10.1117/12.808355
Show Author Affiliations
Kazuue Fujita, Hamamatsu Photonics K.K. (Japan)
Tadataka Edamura, Hamamatsu Photonics K.K. (Japan)
Naota Akikusa, Hamamatsu Photonics K.K. (Japan)
Atsushi Sugiyama, Hamamatsu Photonics K.K. (Japan)
Takahide Ochiai, Hamamatsu Photonics K.K. (Japan)
Shinichi Furuta, Hamamatsu Photonics K.K. (Japan)
Akio Ito, Hamamatsu Photonics K.K. (Japan)
Masamichi Yamanishi, Hamamatsu Photonics K.K. (Japan)
Hirofumi Kan, Hamamatsu Photonics K.K. (Japan)

Published in SPIE Proceedings Vol. 7230:
Novel In-Plane Semiconductor Lasers VIII
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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