Abstract
High-power cw λ∼4 μm quantum-cascade lasers (QCLs) are demonstrated. The effect of different cavity length and laser die bonding is also investigated. For a high-reflectivity-coated 11-μm -wide and 4-mm -long epilayer-down bonded QCL, cw output powers as high as 1.6 W at 80 K and 160 mW at 298 K are obtained, and the cw operation is achieved up to 313 K with 12 mW. The laser exhibits a threshold current density of 1.96 kA cm2, a slope efficiency of 737 mWA, and a maximum wall-plug efficiency of 0.9% under cw mode at 298 K. In pulsed mode, a maximum average power of 552 mW at 298 K is achieved at 45% duty cycle and a characteristic temperature is 176 K from 80 to 393 K.
Original language | English (US) |
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Article number | 041111 |
Pages (from-to) | 1-3 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 88 |
Issue number | 4 |
DOIs | |
State | Published - 2006 |
Funding
This work is partially funded by the Defense Advanced Research Projects Agency (DARPA), the Air Force Office of Scientific Research (AFOSR), the Office of Naval Research (ONR), and the Army Research Office (ARO).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)