[13p-2D-1~9] 3.5 Laser system and materials

[13p-2D-6] Stabilization of an Optically Pumped Far Infrared laser by Using an Optical Isolator

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

Keywords:far-infrared laser,isolator,CO2 laser

We have developed simultaneously oscillated 48- and 57-μm CH₃OD lasers pumped by a 9R(8) CO₂ laser for interferometer and polarimeter of fusion plasma diagnostics. It is important to reduce a back reflection of the pump CO₂ laser from a far-infrared (FIR) laser cavity in order to realize the stable laser oscillations. Therefore, the two-color FIR lasers have been stabilized by an optical isolator using a quarter wave plate and an absorbing thin-film reflectors mirror.