[21a-E203-1~9] 3.5 Laser system and materials

[21a-E203-2] The stable operation of high power Tm³⁺:ZBLAN cascaded fiber MOPA at around 810 nm

〇Eiji Kajikawa¹, Tomohiro Ishii¹, Kazuhiko Ogawa², Mitsuru Musha¹ (1.Inst. for Laser Science, Univ. of Electro-Commun., 2.FiberLabs inc.)

Keywords:fiber, photodarkening

We have developed Tm³⁺:ZBLAN fiber MOPA at around 810 nm for the lattice laser of Sr optical lattice clock. By using real-time photobleaching and preamplifier, the output power of 1.5 W and the signal-to-noise ratio of more than 50 dB has been obtained. We would realize further power scaling and long-term stable operation for the next generation Sr optical lattice clock.