Open AccessBeam combining of a broadly and continuously tunable quantum cascade laser
Author(s) -
Fangyuan Sun,
Jinghao Li,
Kang Hai Tan,
Satrio Wicaksono,
Yun Da Chua,
Chongwu Wang,
Mingjin Dai,
Voo Qin Gui Roth,
Soon Fatt Yoon,
Qi Jie Wang
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.470631
Subject(s) - optics , cascade , collimated light , materials science , quantum cascade laser , laser , beam (structure) , lens (geology) , laser beam quality , laser beams , optoelectronics , physics , chemistry , chromatography
We report a cost-efficient method to demonstrate the beam combining of five laser elements in an array of tunable slot waveguide quantum cascade lasers in the mid-infrared region at around 10 µm. An aspherical lens with five fine-tuned mini mirrors was employed to collimate the individual beams from the laser array. To verify the feasibility of this beam combining approach, the combined beams were coupled into a hollow-core fiber gas cell with a low numerical aperture (N.A.) of 0.03 and a coupling efficiency >= 0.82, for gas sensing of binary compound gases of ammonia and ethylene simultaneously.