Title :
Dependence of the Linewidth Enhancement Factor on the Temperature Induced Detuning of a Distributed Feedback Grating in a Quantum Cascade Laser
Author :
von Staden, J. ; Gensty, T. ; Elsasser, W. ; Giuliani, G. ; Mann, Ch.
Author_Institution :
Tech. Univ. of Darmstadt, Darmstadt
Abstract :
The linewidth enhancement factor (or alpha parameter) describes the coupling of amplitude and phase in a semiconductor laser. In quantum cascade lasers, the self-mixing effect necessary for single mode operation, is usually realized by using a distributed feedback grating. Such a grating is optimized to work for a special wavelength at a fixed temperature. If the temperature of the laser device differs from the optimum temperature the grating was designed for, there is a detuning of the grating wavelength from the gain peak. We investigate the effect of this detuning on the value of the linewidth enhancement factor.
Keywords :
diffraction gratings; distributed feedback lasers; laser beams; laser modes; laser tuning; light interferometry; quantum cascade lasers; distributed feedback grating; grating wavelength detuning; laser device temperature; linewidth enhancement factor; optimum temperature; quantum cascade laser; self-mixing interferometer technique; semiconductor lasers; single mode operation; Distributed feedback devices; Gratings; Laser feedback; Laser modes; Optical interferometry; Quantum cascade lasers; Quantum well lasers; Semiconductor lasers; Temperature dependence; Wavelength measurement;
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
DOI :
10.1109/CLEOE-IQEC.2007.4385946
