Thumbnail
Access Restriction
Open

Author Wienold, M. ♦ Röben, B. ♦ Lü, X. ♦ Rozas, G. ♦ Schrottke, L. ♦ Biermann, K. ♦ Grahn, H. T.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ DESIGN ♦ ELECTRONS ♦ EMISSION ♦ FREQUENCY DEPENDENCE ♦ LASERS ♦ PHONONS ♦ PULSES ♦ RELAXATION ♦ SCATTERING
Abstract We report on the observation of an approximately linear reduction in the maximum operating temperature with an increasing emission frequency for terahertz quantum-cascade lasers between 4.2 and 5.4 THz. These lasers are based on the same design type, but vary in period length and barrier height for the cascade structure. The sample emitting at the highest frequency around 5.4 THz can be operated in pulsed mode up to 56 K. We identify an additional relaxation channel for electrons by longitudinal optical phonon scattering from the upper to the lower laser level and increasing optical losses toward higher frequencies as major processes, leading to the observed temperature behavior.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-16
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 20


Open content in new tab

   Open content in new tab