Ex) Article Title, Author, Keywords
New Phys.: Sae Mulli 2021; 71: 301-304
Published online March 31, 2021 https://doi.org/10.3938/NPSM.71.301
Copyright © New Physics: Sae Mulli.
Ji Yoon GWAG, Young Ho PARK, Soo Hyung CHO*
Hanwha Systems, Seongnam 13524, Korea
Recently, the quantum cascade laser (QCL) has been spotlighted as a next-generation light source in the mid-infrared region because of its increase in optical power due to the development of manufacturing technology. However, the optical power of a single QCL is limited by the self-heating effect. Therefore, high-efficiency beam combination technology is essential to achieve a high-power mid-IR laser. In this paper, we demonstrate a simple and effective beam combination method that can be used for QCLs in the 3.85 -- 4.15 $\mu$m wavelength region. We achieved a high 89.0% efficiency by combining three QCLs using flat mirrors. In addition, we adjusted the divergence angles of the fast axis and the slow axis equally for easy application in various wavelength regions.
Keywords: Quantum cascade laser, Beam combination, Optics