[10a-W834-1~11] 3.5 Laser system and materials

[10a-W834-8] Development of a stable and high power Tm³⁺:ZBLAN fiber MOPA at 813 nm

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

Keywords:fiber amplifier, fluoride fiber, photodarkening

We have developed Tm³⁺:ZBLAN fiber MOPA at 813 nm for the lattice laser of Sr optical lattice clock. In the previous conference, we reported the maximum output power of ~2 W with real-time photobelaching and the dual-wavelength-pumping at 1050 nm and 1220 nm. In this conference, we will show the results of using high concentration fiber with real-time photobleaching and single-wavelength pumping at 1050 nm. We have obtained the same level slope efficiency as that obtained by the dual-wavelength pumping, and the output power of more than 1 W without saturation. Furthermore, we have observed the photobleaching effect by the signal light at 813 nm. By optimizing the pre-amplifier, we would realize the stable and high power lattice laser with simple configuration.