Title :
Gain and losses in terahertz quantum cascade laser
Author :
Kröll, J. ; Darmo, J. ; Dhillon, S.S. ; Unterrainer, K. ; Sirtori, C. ; Marcadet, X. ; Calligaro, M.
Author_Institution :
Vienna Univ. of Technol., Vienna
Abstract :
The waveguide losses and the laser gain of a THz quantum cascade laser as a function of temperature and driving current are determined in this study by coupling broadband THz pulses into the laser´s waveguide. Measurements are performed based on the bound-to-continuum design. Results show that at high temperatures the lasing operation in not only hampered by phonon/electron scattering but also by thermally activated absorption.
Keywords :
absorption coefficients; electron-phonon interactions; optical losses; optical waveguides; quantum cascade lasers; bound-to-continuum design; broadband THz pulses; laser gain; lasing operation; phonon-electron scattering; terahertz quantum cascade laser; thermally activated absorption; waveguide losses; Absorption; Electrons; Optical coupling; Optical pulses; Particle scattering; Performance evaluation; Phonons; Quantum cascade lasers; Temperature; Waveguide lasers;
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.2007.4385941
