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Room temperature quantum cascade lasers with 27% wall plug efficiency
4.A. Lyakh, R. Maulini, A. Tsekoun, R. Go, C. Pflugl, L. Diehl, Q. J. Wang, F. Capasso, and C. K. N. Patel, Appl. Phys. Lett. 95, 141113 (2009).
11.A. Lyakh, C. Pflugl, L. Diehl, Q. J. Wang, F. Capasso, X. J. Wang, J. Y. Fan, T. Tanbun-Ek, R. Maulini, A. Tsekoun, R. Go, and C. K. N. Patel, Appl. Phys. Lett. 92, 111110 (2008).
16.M. D. Escarra, A. J. Hoffman, K. J. Franz, S. S. Howard, R. Cendejas, X. Wang, J. Fan, and C. Gmachl, Appl. Phys. Lett. 94, 251114 (2009).
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Using the recently proposed shallow-well design, we demonstrate InP based quantum cascade lasers(QCLs) emitting around with 27% and 21% wall plug efficiencies in room temperature (298 K) pulsed and continuous wave (cw) operations, respectively. The laser core consists of 40 QCL-stages. The highest cw efficiency is obtained from a buried-ridge device with a ridge width of and a cavity length of 5 mm. The front and back facets are antireflection and high-reflection coated, respectively. The maximum single facet cw power at room temperature amounts to 5.1 W.
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