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Proceedings Paper

Broad gain injectorless quantum-cascade lasers with low threshold emitting around 8.6 μm
Author(s): Hua Li; Simeon Katz; Gerhard Boehm; Markus-Christian Amann
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Paper Abstract

Broad gain lasers attract much interest due to the practical gas sensing applications. A step well structure with double optical transitions is implemented in the active region of injectorless quantum-cascade lasers (QCLs) to achieve extended gain bandwidth. The step well is constructed by a "short period superlattice" which provides an equivalent GaInAlAs alloy quantum step well in each active module. The fabricated devices show an ultrabroadband gain spectrum of 480 cm-1 (4 μm) at room temperature in pulsed mode. The laser threshold current density is as low as 1.1 kA/cm2 which is the lowest among the broad gain QCLs emitting at similar wavelengths and the slope efficiency is 1.6 W/A at room temperature.

Paper Details

Date Published: 28 November 2011
PDF: 6 pages
Proc. SPIE 8308, Optoelectronic Materials and Devices VI, 83081R (28 November 2011); doi: 10.1117/12.917908
Show Author Affiliations
Hua Li, Walter Schottky Institut (Germany)
Simeon Katz, Walter Schottky Institut (Germany)
Gerhard Boehm, Walter Schottky Institut (Germany)
Markus-Christian Amann, Walter Schottky Institut (Germany)


Published in SPIE Proceedings Vol. 8308:
Optoelectronic Materials and Devices VI
Guang-Hua Duan, Editor(s)

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