We demonstrate a tunable narrow-linewidth fiber MOPA system around 810 nm for the light source of the Sr optical lattice clock. The coherent cw light source with a wavelength of 813.42 nm was generated by a combination of a narrow linewidth external-cavity laser diode and a Tm-doped ZBLAN fiber amplifier, which was upconversion-pumped by an Yb-doped fiber laser at 1064 nm. The maximum output power of 1.1 W was obtained with the launched power of 17 W, which is the highest power obtained from a Tm-doped fiber amplifier ever reported.
© 2014 Optical Society of America
Lasers and Laser Optics
Original Manuscript: December 13, 2013
Revised Manuscript: March 3, 2014
Manuscript Accepted: March 3, 2014
Published: March 31, 2014
Kenta Kohno, Yu-ichi Takeuchi, Toshiyuki Kitamura, Ken’ichi Nakagawa, Ken-ichi Ueda, and Mitsuru Musha, "1 W single-frequency Tm-doped ZBLAN fiber MOPA around 810 nm," Opt. Lett. 39, 2191-2193 (2014)