@article { ISI:000256196600001,
	title = {Room temperature terahertz quantum cascade laser source based on intracavity difference-frequency generation},
	journal = {APPLIED PHYSICS LETTERS},
	volume = {92},
	number = {20},
	year = {2008},
	month = {MAY 19},
	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 our progress in the development of a terahertz quantum cascade laser source based on intracavity terahertz difference-frequency mixing in a dual-wavelength mid-infrared quantum cascade laser with the active region engineered to possess giant second-order nonlinear susceptibility. In this letter, we demonstrate devices that operate in mid-infrared at lambda(1)=8.9 mu m and lambda(2)=10.5 mu m and produce terahertz output at lambda approximate to 60 mu m via difference-frequency generation with 7 mu W output power at 80 K, 1 mu W output at 250 K, and still approximately 300 nW output at 300 K. (c) 2008 American Institute of Physics.},
	issn = {0003-6951},
	doi = {10.1063/1.2919051},
	author = {Belkin, Mikhail A. and Federico Capasso and Xie, Feng and Belyanin, Alexey and Fischer, Milan and Wittmann, Andreas and Faist, Jerome}
}
