25 March 2005 High-power CW mid-IR quantum cascade lasers
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Abstract
We report the cw operation of quantum cascade lasers that do not require cryogenic cooling and emit at λ = 4.7-6.2 μm. At 200 K, more than 1 W of output power is obtained from 12-μm-wide stripes, with a wall-plug efficiency (ηwall) near 10%. Room-temperature cw operation has also been demonstrated, with a maximum output power of 640 mW (ηwall = 4.5%) at 6 μm and 260 mW (ηwall = 2.3%) at 4.8 μm. Far-field characterization indicates that whereas the beam quality remains close to the diffraction limit in all of the tested lasers, in the devices emitting at 6.2 μm the beam tends to steer by as much as 5-10° degrees in either direction with varying temperature and pump current.
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Jerry R. Meyer, Jerry R. Meyer, William W. Bewley, William W. Bewley, James R. Lindle, James R. Lindle, Igor Vurgaftman, Igor Vurgaftman, Allan J. Evans, Allan J. Evans, Jae Su Yu, Jae Su Yu, Steven Slivken, Steven Slivken, Manijeh Razeghi, Manijeh Razeghi, } "High-power CW mid-IR quantum cascade lasers", Proc. SPIE 5732, Quantum Sensing and Nanophotonic Devices II, (25 March 2005); doi: 10.1117/12.597072; https://doi.org/10.1117/12.597072
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