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

[19p-431B-6] High powaer and highly efficient 813-nm Tm³⁺:ZBLAN fiber MOPA

〇Tomohiro Ishii¹, Eiji Kajikawa¹, Takashi Kubo¹, Mitsuru Musha¹, Kazuhiko Ogawa² (1.ILS/UEC, 2.FiberLabs Inc.)

Keywords:ZBLAN fiber amplifier, 813 nm, photobreaching

We have developed 813-nm light source for Sr optical lattice clock. By using a Tm-doped ZBLAN fiber amplifier, high output power or more than 1 W was obtained by two-stage pumping with 1050nm, and 1220nm fiber lasers. The photodarkening has been observed in high-power operation With the help of 532nm laser light induced into the fiber amplifiefer in high-power operation, the stable output power of more than 1W has been obtained due to photobreaching effect.