%0 Journal Article %J LASER PHYSICS %D 2007 %T Nonlinear optics with quantum cascade lasers %A Xie, F. %A Chaganti, V. R. %A Smith, D. %A Belyanin, A. %A F. Capasso %A Gmachl, C. %X We discuss new approaches to monolithic integration of quantum cascade lasers with resonant intersubband nonlinearities. We show that the proposed approaches can greatly enhance the performance of quantum cascade lasers and give rise to new functionalities. Examples considered include extreme frequency up- or down-conversion and wide-range electric tuning. %B LASER PHYSICS %I IOP PUBLISHING LTD %C TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND %V 17 %P 672-679 %8 MAY %G eng %U https://doi.org/10.1134/S1054660X07050118 %N 5 %9 Article %R 10.1134/S1054660X07050118