%0 Journal Article %J APPLIED PHYSICS LETTERS %D 2008 %T 1.6 W high wall plug efficiency, continuous-wave room temperature quantum cascade laser emitting at 4.6 mu m %A Lyakh, A. %A Pfluegl, C. %A Diehl, L. %A Wang, Q. J. %A Federico Capasso %A Wang, X. J. %A Fan, J. Y. %A Tanbun-Ek, T. %A Maulini, R. %A Tsekoun, A. %A Go, R. %A Patel, C. Kumar N. %X A strain-balanced, InP-based quantum cascade laser structure designed for light emission at 4.6 mu m was grown by metal-organic chemical vapor deposition. A maximum total optical power of 1.6 W was obtained in continuous-wave mode at 300 K for uncoated devices processed in buried heterostructure geometry with stripe dimensions of 5 mm by 9.5 mu m. Corresponding maximum wall plug efficiency and threshold current density were measured to be 8.8% and 1.05 kA/cm(2), respectively. Fully hermetically packaged laser of identical dimensions produced in excess of 1.5 W under the same conditions. (C) 2008 American Institute of Physics. %B APPLIED PHYSICS LETTERS %I AMER INST PHYSICS %C CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA %V 92 %8 MAR 17 %G eng %N 11 %9 Article %R 10.1063/1.2899630