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

fYear

2007

fDate

17-22 June 2007

Firstpage

1

Lastpage

1

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/CLEOE-IQEC.2007.4385941

Filename

4385941