Title :
Gain competition in multicolor quantum cascade lasers
Author :
Pflugl, C. ; Geiser, M. ; Belyanin, A. ; Wang, Q.J. ; Yu, N. ; Edamura, T. ; Yamanishi, M. ; Kan, H. ; Fischer, M. ; Wittmann, A. ; Faist, J. ; Capasso, Federico
Author_Institution :
Sch. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA, USA
Abstract :
We investigated dual-color mid-infrared quantum cascade lasers. We found that due to gain competition mid-infrared modes tend to start lasing in higher order lateral modes. The mid-infrared mode with the lower threshold current reduces population inversion for the second laser with the higher threshold current due to stimulated emission. A theoretical model describing this effect was developed, which is important for future device optimization.
Keywords :
Laser beams; Laser excitation; Laser modes; Laser theory; Laser transitions; Pump lasers; Quantum cascade lasers; Semiconductor lasers; Stimulated emission; Threshold current;
Conference_Titel :
Lasers and Electro-Optics (CLEO) and Quantum Electronics and Laser Science Conference (QELS), 2010 Conference on
Conference_Location :
San Jose, CA, USA
Print_ISBN :
978-1-55752-890-2
Electronic_ISBN :
978-1-55752-890-2
