Beam combining of a broadly and continuously tunable quantum cascade laser

Beam combining of a broadly and continuously tunable quantum cascade laser

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...

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Bibliographic Details
Main Authors: Sun, Fangyuan, Li, Jinghao, Tan, Kian Hua, Wicaksono, Satrio, Chua, Yun Da, Wang, Chongwu, Dai, Mingjin, Voo, Roth Qin Gui, Yoon, Soon Fatt, Wang, Qi Jie
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Electrical and electronic engineering
Aspherical Lens
Beam Combining
Online Access:https://hdl.handle.net/10356/165643
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Institution: Nanyang Technological University
Language: English
Description
Summary: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.

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