Incoherent polarization beam combination for mid-infrared semiconductor lasers

Sensen Li; Zhuokun Wu; Fan Wu; Guanjun Zhou; Xiangli Bi; Chaowei An; Qianghu Liu; Ruiyao Yang; Jinnan Wang; Yu Li; Jun Cai; Xiusheng Yan

doi:10.1117/12.2533789

17 May 2019 Incoherent polarization beam combination for mid-infrared semiconductor lasers

Sensen Li, Zhuokun Wu, Fan Wu, Guanjun Zhou, Xiangli Bi, Chaowei An, Qianghu Liu, Ruiyao Yang, Jinnan Wang, Yu Li, Jun Cai, Xiusheng Yan

Author Affiliations +

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 111702Z (2019) https://doi.org/10.1117/12.2533789
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

Abstract

The mid-infrared band of 3~5 μm wavelength is a very important atmospheric window. The mid-infrared lasers are widely applied in laser countermeasure, laser illumination and trace gas detection. At present, the mid-infrared laser sources mainly include solid-state optical parametric oscillation lasers, fiber lasers, mid-infrared supercontinuum spectrum laser and mid-infrared semiconductor lasers, i.e. quantum cascade lasers. In these lasers, quantum cascade laser is the only one that can realize the conversion from electricity to light. In this paper, the method of incoherent beam combination of mid-infrared semiconductor lasers is studied. Two lasers are combined in a common aperture by using a single polarizer based on the polarization characteristics of the output laser of quantum cascade laser. Results show that the incoherent power superposition of mid-infrared quantum cascade lasers can be achieved by polarization beam combining, and the beam combining efficiency is not less than 90%. The farfield divergence angle is about 5 mrad, which is consistent with the farfield divergence angle of the two sub-beams.

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Sensen Li, Zhuokun Wu, Fan Wu, Guanjun Zhou, Xiangli Bi, Chaowei An, Qianghu Liu, Ruiyao Yang, Jinnan Wang, Yu Li, Jun Cai, and Xiusheng Yan "Incoherent polarization beam combination for mid-infrared semiconductor lasers", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 111702Z (17 May 2019); https://doi.org/10.1117/12.2533789

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