High-power frequency comb at 2 μm wavelength emitted by a Tm-doped fiber laser system

in: Optics Letters (2018)
Gaida, Christian; Heuermann, Tobias; Gebhardt, Martin; Shestaev, Evgeny; Butler, Thomas; Lilienfein, Nikolai; Sulzer, Philipp; Fischer, Marc; Holzwarth, Ronald; Leitenstorfer, Alfred; Pupeza, Ioachim; Limpert, Jens; Gerz, Daniel
We report on the generation of a high-power frequency comb in the 2 ìm wavelength regime featuring high amplitude and phase stability with unprecedented laser parameters, combining 60 W of average power with <30 fs pulse duration. The key components of the system are a mode-locked Er:fiber laser, a coherence-preserving nonlinear broadening stage, and a high-power Tm-doped fiber chirped-pulse amplifier with subsequent nonlinear selfcompression of the pulses. Phase locking of the system resulted in a phase noise of less than 320 mrad measured within the 10 Hz–30 MHz band and 30 mrad in the band from 10 Hz to 1 MHz.

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