[5p-C14-1~14] 3.5 Laser system and materials

△ [5p-C14-13] CW Operation of 2.8 μm Er:Lu₂O₃ Ceramic Lasers at Various Doping Concentration

〇Hiyori Uehara¹, Ryo Yasuhara², Shigeki Tokita¹, Junji Kawanaka¹, Masanao Murakami³, Seiji Shimizu⁴ (1.ILE, Osaka Univ., 2.National Institute for Fusion Science, 3.Mitsuboshi Diamond Industrial Co., Ltd., 4.Spectronix Corporation)

Keywords:mid-IR lasers, ceramic lasers, rare-earth sesquioxides

We have successfully demonstrated an efficient cw operation of Er-doped Lu₂O₃ ceramic laser at 2.8 μm wavelength and evaluated the doping concentration dependence. A slope efficiency of 29% was achieved with a high-quality transparent ceramic with doping concentration of 11 at. %. To our knowledge, this is the highest slope efficiency obtained by a diode-pumped Er:Lu₂O₃ laser including the reports using a single crystal. In addition, an output power of 2.3 W was obtained under the pump power of 10 W, which is also the highest value obtained by Er:Lu₂O₃ ceramic laser.