Spatial beam quality analysis of mid-wave infrared quantum cascade lasers

Biyi Wang; Sensen Li; Guanjun Zhou; Jingsheng Zhang; Zhaohong Liu; Ning Li; Xiusheng Yan

doi:10.1117/12.2573442

20 September 2020 Spatial beam quality analysis of mid-wave infrared quantum cascade lasers

Biyi Wang, Sensen Li, Guanjun Zhou, Jingsheng Zhang, Zhaohong Liu, Ning Li, Xiusheng Yan

Proceedings Volume 11539, Technologies for Optical Countermeasures XVII; and High-Power Lasers: Technology and Systems, Platforms, Effects IV; 115390K (2020) https://doi.org/10.1117/12.2573442
Event: SPIE Security + Defence, 2020, Online Only

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Abstract

Quantum cascade laser (QCL) emitting in the mid-wave infrared atmospheric windows (3 μm to 5 μm) will be of immediate use to several civilian applications, including airborne self-defense protection system and trace gas sensing and free space optical communications. At present, the mid-infrared laser sources mainly include solid-state optical parametric oscillation lasers, fiber lasers, and QCL. In these lasers, quantum cascade laser is the only one that can realize the conversion from electricity to light. Since its invention in 1994, with the deepening of scientific research, quantum cascade laser performance has been continuously improved, and the output laser power and beam quality of single transistor has been continuously improved. In this work, the output beam quality of QCL is analyzed. the evaluating method of the laser beam quality is analized in theory based on the Gaussian beam transmittion law. The output nearfiled and farfield of the single quantum cascade laser is measured in the experiment. The output divergence angle is calculated and the output beam quality is analized by using the M² factor.

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Biyi Wang, Sensen Li, Guanjun Zhou, Jingsheng Zhang, Zhaohong Liu, Ning Li, and Xiusheng Yan "Spatial beam quality analysis of mid-wave infrared quantum cascade lasers", Proc. SPIE 11539, Technologies for Optical Countermeasures XVII; and High-Power Lasers: Technology and Systems, Platforms, Effects IV, 115390K (20 September 2020); https://doi.org/10.1117/12.2573442

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