Title :
Mode switching and singlemode tuning in two-segment distributed feedback quantum cascade lasers
Author :
Höfling, S. ; Seufert, J. ; Fischer, M. ; Rösener, B. ; Koeth, J. ; Reithmaier, J.P. ; Forchel, A.
Author_Institution :
Dept. of Tech. Phys., Univ. Wurzburg, Germany
Abstract :
Two-segment distributed feedback (DFB) GaAs/AlGaAs bound-to-continuum quantum cascade lasers emitting at ∼10.8 μm were fabricated and investigated. Reversible switching between two different DFB modes by current injection control yielding sidemode suppression ratios up to >23 dB is reported. Two different devices were fabricated for which the distance between the different DFB modes is 1.5 and 2.5 cm-1, respectively, and quasi-continuous tuning over a range of >9 cm-1 (105 nm) between 120 and 250 K was observed.
Keywords :
III-V semiconductors; aluminium compounds; distributed feedback lasers; gallium arsenide; laser modes; quantum cascade lasers; 105 nm; 120 K; 250 K; GaAs-AlGaAs; current injection control; distributed feedback quantum cascade lasers; mode switching; reversible switching; singlemode tuning;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20063715
