[19p-431B-1~18] 3.5 Laser system and materials

[19p-431B-11] Development of Far-infrared Laser Output Coupler Using SiC Substrate

〇Kazuya Nakayama¹, Shigeki Okajima¹, Tsuyoshi Akiyama², Kenji Tanaka², Kazuo Kawahata² (1.Chubu Univ., 2.NIFS)

Keywords:FIR laser, CO2 laser, laser output coupler

We have developed a 48- and 57-µm CH₃OD laser pumped by a 9R(8) CO₂ laser as an optical source of interferometer/polarimeter for future fusion plasma diagnostics. These FIR lasers can be oscillated simultaneously. For these applications, high power and high quality laser beams are required. The laser output coupler is an important optical element in order to realize this requirement, but there is no suitable one for these FIR lasers. Therefore, we have tested a laser output mirror combining a semi-insulating 6H-SiC substrate and a metal mirror with a center hole. As a result, it was confirmed that the 48- and 57-µm CH₃OD laser oscillated.