Open AccessHigh-power, continuous-wave, phase-locked quantum cascade laser arrays emitting at 8 µm
Author(s) -
Wenjia Zhou,
Qing Lü,
Donghai Wu,
S. Slivken,
Manijeh Razeghi
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.015776
Subject(s) - optics , cascade , laser , materials science , quantum cascade laser , optoelectronics , quantum well , injection seeder , continuous wave , semiconductor laser theory , physics , chemistry , chromatography
We report a room-temperature eight-element phase-locked quantum cascade laser array emitting at 8 µm with a high continuous-wave power of 8.2 W and wall plug efficiency of 9.5%. The laser array operates primarily via the in-phase supermode and has single-mode emission with a side-mode suppression ratio of ~20 dB. The quantum cascade laser active region is based on a high differential gain (8.7 cm/kA) and low voltage defect (90 meV) design. A record high wall plug efficiency of 20.4% is achieved from a low loss buried ridge type single-element Fabry-Perot laser operating in pulsed mode at 20 °C.