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Applied Physics Letters / Volume 94 / Issue 16 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 94, 161114 (2009); http://dx.doi.org/10.1063/1.3123390 (3 pages)

Gain measurements in strain-compensated quantum cascade laser

Tobias Gresch1, Jérôme Faist1, and Marcella Giovannini2

1Quantum Optoelectronics Group, Institute for Quantum Electronics, ETH Zürich, Wolfgang-Pauli-Strasse 16, 8093 Zürich, Switzerland
2Institute of Physics, University of Neuchâtel, Rue A.-L. Breguet 1, 2000 Neuchâtel, Switzerland

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(Received 29 January 2009; accepted 26 March 2009; published online 24 April 2009)

Spectrally resolved gain measurements of a strain-compensated quantum cascade laser, emitting at 4.8 μm, are presented. Measurements have been acquired using a multisection cavity technique. The shape of the gain is compared with electroluminescence measurements whereas gain coefficients are compared to values obtained from laser data, studying the dependence of the laser threshold current with cavity length. Gain coefficients of 9.9 cm kA−1 at 80 K and 3.2 cm kA−1 at 322 K are found and we show that the temperature dependence of the gain coefficient is governed by optical phonon scattering.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

electroluminescence, laser cavity resonators, phonons, quantum cascade lasers

PACS

  • 42.55.Px

    Semiconductor lasers; laser diodes

  • 42.60.By

    Design of specific laser systems

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3123390

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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