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Extremely temperature-insensitive continuous-wave quantum cascade lasers
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10.1063/1.4765073
/content/aip/journal/apl/101/18/10.1063/1.4765073
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/18/10.1063/1.4765073
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Figures

Image of FIG. 1.
FIG. 1.

Schematic conduction band diagram and moduli squared of the relevant wavefunctions of the injector/active/injector parts in the active region. An electric field of 41 kV/cm was applied to align the structure. The strain-balanced In0.6Ga0.4As/In0.44Al0.56As layer sequence of one period of the active layers, in angstroms, starting from the injection barrier (toward theright side) is as follows: 35/32/23/77/7/60/13/54/16/41/14/38/15/36/16/36/20/36/23/36/26/35 where InAlAs barrier layers are in bold, InGaAs QW layers in roman, and doped layers (Si, 5 × 1010 cm−2) are underlined.

Image of FIG. 2.
FIG. 2.

(a) Cw current-light output (I-L) characteristics of the 8 μm-wide, 3.0 mm-long, HR-coated, buried heterostructure laser with a thick gold film at different heat sink temperatures. The voltage-current characteristics are also shown. The inset shows the spectra in both subthreshold and above threshold operation of the dual-upper-state laser at 300 K. (b) Temperature-dependent threshold current densities for pulsed and cw operations for the 8 μm-wide, 3 mm-long, epi-side down bonded laser. Solid curves are exponential fit with J th = J 0exp(T/T 0) and η = η 0exp(−T/T 1) for the threshold current density and slope efficiency, respectively.

Image of FIG. 3.
FIG. 3.

(a) Pulsed current-light output characteristics of the 8 μm-wide and 1.0 mm-long, as cleaved, buried heterostructure laser at different heat sink temperatures. The voltage-current characteristics are also shown. The inset shows the laser spectra at various currents at 300 K. (b) Threshold current and slope efficiency at the threshold as functions of the heat sink temperature in a pulsed operation.

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/content/aip/journal/apl/101/18/10.1063/1.4765073
2012-11-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Extremely temperature-insensitive continuous-wave quantum cascade lasers
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/18/10.1063/1.4765073
10.1063/1.4765073
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