@article { ISI:000312830700017, title = {Master-oscillator power-amplifier quantum cascade laser array}, journal = {APPLIED PHYSICS LETTERS}, volume = {101}, number = {26}, year = {2012}, month = {DEC 24}, publisher = {AMER INST PHYSICS}, type = {Article}, address = {CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA}, abstract = {We report on the demonstration of an array of master-oscillator power-amplifier quantum cascade lasers (QCLs) operating in single-mode at different wavelengths between 9.2 and 9.8 mu m. In each device, the output of a distributed feedback QCL is injected into a tapered QCL section which acts as an amplifier while maintaining a high beam quality due to adiabatic mode spreading. All array elements feature longitudinal as well as transverse single-mode emission at peak powers between 0.8 and 3.9W at room temperature. The high output power and excellent beam quality render the array highly suitable for stand-off spectroscopy applications. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773377]}, issn = {0003-6951}, doi = {10.1063/1.4773377}, author = {Rauter, P. and Menzel, S. and Goyal, A. K. and Goekden, B. and Wang, C. A. and Sanchez, A. and Turner, G. W. and F. Capasso} }