[9p-A13-1~12] CS.4 Code-sharing session of 3.10 &3.12

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-A13-1] Device Characteristics of Photonic Crystal Surface-Emitting Quantum Cascade Lasers with Low-Reflectivity Coatings

〇Tetsuya Miyagawa¹, Tomoki Tsukada¹, Lisa Suzuki¹, Kei Kaneko¹, Tsutomu Kakuno¹, Rei Hashimoto¹, Afshan Begum², Naoki Ikeda², Takaaki Mano², Keisuke Watanabe², Takashi Kuroda², Kazuaki Sakoda², Shinji Saito³ (1.Toshiba Corp., 2.NIMS, 3.Shonan Inst.)

Keywords:

Quantum Cascade Lasers,Photonic Crystals,Low-Reflectivity Coating

In photonic crystal surface-emitting quantum cascade lasers, optical interference caused by reflections at the top and bottom surfaces of the device can significantly affect the output characteristics. In this study, a low-reflectivity coating was introduced on the emission surface to investigate the influence of surface reflectivity on device performance. The optical output and lasing characteristics were evaluated for the same device before and after the deposition of the coating. As a result, an increase in optical output exceeding the estimated improvement based on enhanced light extraction efficiency was observed. This suggests that, in addition to the reduction in surface reflectivity, optical interference effects within the device play an important role. Further detailed investigation of the reflected light inside the device is expected to lead to additional improvements in output power and lasing performance.