[10p-W834-1~14] 3.5 Laser system and materials

[10p-W834-13] Output characteristics of Yb:YAG TRAM laser using water jet impingement cooling

〇Seiji Taniguchi¹, Haik Chosrowjan¹, Dazhi Li¹, Shinji Motokoshi¹, Masayuki Fujita¹, Yasukazu Izawa¹, Shingo Nishikata², Tomoya Morioka², Koichi Hamamoto², Hiroshi Ikebuchi², Yuichi Ohtani², Takeshi Kaneko², Hiroyuki Daigo² (1.Inst. Laser Tech., 2.MHI)

Keywords:Yb:YAG CW laser, total-reflection active mirror, water jet impingement cooling

We have been developing Yb: YAG TRAM laser using zero phonon line excitation and water impinging jet cooling method with the goal of developing a high power CW laser driven at room temperature. In order to obtain kW class output, we performed a laser oscillation experiment under high excitation condition (~2.5 kW), and oscillation output of almost 1 kW was obtained with absorption power of 2 kW. The slope efficiency at the cooling water temperature of 7 ℃ was 0.63, which was found to be about 5% higher than at 18 ℃ (normal temperature).