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We report on a Holmium-doped femtosecond polarization-maintaining (PM) all-fiber amplifier system at a central wavelength of 2050nm that is designed as a seed source for a Holmium:YLF-based amplifier. The amplifier system employs a three-stage amplification process for power scaling while reducing the repetition rate. The first two Holmium-fiber amplifiers are core-pumped at a wavelength of 1940 nm. The final amplification stage is based on a double-clad Thulium-fiber, whose gain spectrum allows for the simultaneous amplification of the remaining pump light from the second amplifier stage and the Holmium-signal. Temporal pulse-stretching to a pulse duration of 190 ps using a chirped fiber Bragg grating (CFBG) prevents nonlinearities. We obtained pulse energies up to 300 nJ at 50 kHz.
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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Lea Schlotmann, Moritz Hinkelmann, Frithjof Haxsen, Jörg Neumann, Dietmar Kracht, "Monolithic femtosecond holmium fiber MOPA system at 2050 nm," Proc. SPIE 13003, Fiber Lasers and Glass Photonics: Materials through Applications IV, 130030A (20 June 2024); https://doi.org/10.1117/12.3017127