Continuous-wave operation of GaInAs-AlGaAsSb quantum cascade lasers

We report on the demonstration of continuous-wave (CW) operation of GaInAs-AlGaAsSb quantum cascade (QC) lasers. By placing a 2.5-μm-thick gold layer on both sides of the laser ridge to extract heat from the active region in the lateral direction, together with mounting the device epilayer down, we...

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Bibliographic Details
Published in:IEEE photonics technology letters 2005-11, Vol.17 (11), p.2283-2285
Main Authors: Yang, Q., Bronner, W., Manz, C., Moritz, R., Mann, Ch, Kaufel, G., Kohler, K., Wagner, J.
Format: Article
Language:English
Subjects:
Conducting materials
Continuous wave (CW)
Density
Devices
Electrons
Epitaxial growth
GaInAs-AlGaAsSb
Gold
Lasers
mid-infrared
Operating temperature
Optical design
Optical materials
Potential well
Quality control
quantum cascade (QC) lasers
Quantum cascade lasers
Ridges
Threshold currents
Tunneling
Wavelengths
X-ray lasers
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Summary:We report on the demonstration of continuous-wave (CW) operation of GaInAs-AlGaAsSb quantum cascade (QC) lasers. By placing a 2.5-μm-thick gold layer on both sides of the laser ridge to extract heat from the active region in the lateral direction, together with mounting the device epilayer down, we have achieved CW operation of GaInAs-AlGaAsSb QC lasers composed of 25 stages of active/injection regions. The maximum CW operating temperature of the lasers is 94 K, and the emission wavelength is around /spl lambda//spl sim/4.65 μm. For a device with the size of 10×2000 μm 2 , the CW optical output power per facet is 13 mW at 42 K and 4 mW at 94 K. The CW threshold current density is 1.99 kA/cm 2 at 42 K, and 2.08 kA/cm 2 at 94 K, respectively.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2005.857588