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Proceedings Paper

High performance quantum cascade lasers with broadband gain spectra
Author(s): Yu Yao; Xiaojun Wang; Jen-Yu Fan; William O. Charles; Tracy Tsai; Jianxin Chen; Gerard Wysocki; Claire F. Gmachl
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Paper Abstract

QC laser active regions with multiple transitions from strongly coupled upper laser states to lower laser states were designed to achieve broad gain spectra as well as high performance. Two broad gain QC laser designs in the 7-9 μm wavelength region were demonstrated based on the continuum-to-bound design. The first embodiment of one design at ~8 μm enables external cavity tuning over 190 cm-1 (7.5 - 8.8 μm) in pulsed mode operation at 0°C. We also demonstrated a QC laser structure based on a continuum-to-continuum active region in the 4-5 μm wavelength region with a gain spectrum of ~ 430 cm-1. External cavity tuning over 340 cm-1 (4.4 - 5.2 μm) was achieved with this design in pulsed mode operation at 15°C. In spite of the broad gain spectrum, a low threshold current density (1.6 kA/cm2), large slope efficiency (4.5 W/A), good temperature performance (T0=160 K), high peak power (up to 5 W) and high wall plug efficiency (WPE, up to 20%) were achieved for ridge lasers with as cleaved facets, in pulsed mode operation at 295 K, demonstrating that it is possible to make a wide gain spectrum compatible with high power and efficiency performance.

Paper Details

Date Published: 16 February 2011
PDF: 10 pages
Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 795317 (16 February 2011); doi: 10.1117/12.873854
Show Author Affiliations
Yu Yao, Princeton Univ. (United States)
Xiaojun Wang, AdTech Optics, Inc. (United States)
Jen-Yu Fan, AdTech Optics, Inc. (United States)
William O. Charles, Princeton Univ. (United States)
Tracy Tsai, Princeton Univ. (United States)
Jianxin Chen, Princeton Univ. (United States)
Gerard Wysocki, Princeton Univ. (United States)
Claire F. Gmachl, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 7953:
Novel In-Plane Semiconductor Lasers X
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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