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Proceedings Paper

Broadly tunable external cavity quantum-cascade lasers
Author(s): Richard Maulini; Dmitri A. Yarekha; Jean-Marc Bulliard; Mattias Beck; Marcella Giovannini; Jérôme Faist; Emilio Gini
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Paper Abstract

External cavity quantum-cascade lasers (QCLs) emitting in the long-wave infrared (LWIR) around 10 μm and in the mid-wave infrared (MWIR) around 5.2 μm have been realized. The coupling facet of the QC chips was anti-reflection coated and the optical feedback was provided by a diffraction grating arranged in a Littrow configuration. The active regions of the gain elements were based on bound-to-continuum designs having broad gain curves (Approx = to 300 cm-1 full width at half maximum). The LWIR laser was operated in pulsed mode on a thermoelectric (TE) cooler. It could be tuned over a frequency range of 150 cm-1 from 9.1 to 10.55 μm with a peak power ⩾ 30 mW. The MWIR laser was operated in continuous-wave (CW) mode on a TE cooler. It could be tuned over more than 170 cm-1 from 4.95 to 5.4 μm and was single-mode over more than 140 cm-1. Its output power was in excess of 5 mW over 130 cm-1. This broad tunability (10 times more than that of distributed-feedback QCLs) enables new applications of QCLs in high-resolution infrared spectroscopy.

Paper Details

Date Published: 17 November 2005
PDF: 11 pages
Proc. SPIE 6010, Infrared to Terahertz Technologies for Health and the Environment, 601001 (17 November 2005); doi: 10.1117/12.630690
Show Author Affiliations
Richard Maulini, Univ. of Neuchâtel (Switzerland)
Dmitri A. Yarekha, Univ. of Neuchâtel (Switzerland)
Jean-Marc Bulliard, Univ. of Neuchâtel (Switzerland)
Mattias Beck, Univ. of Neuchâtel (Switzerland)
Marcella Giovannini, Univ. of Neuchâtel (Switzerland)
Jérôme Faist, Univ. of Neuchâtel (Switzerland)
Emilio Gini, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 6010:
Infrared to Terahertz Technologies for Health and the Environment
Alexey A. Belyanin; Rebekah A. Drezek; Claire F. Gmachl, Editor(s)

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