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Gaida, C.; Heuermann, T.; Gebhardt, M.; Shestaev, E.; Butler, T. P.; Gerz, D.; Lilienfein, N.; Sulzer, P.; Fischer, M.; Holzwarth, R.; Leitenstorfer, A.; Pupeza, I; Limpert, J. (2018): High-power frequency comb at 2 mu m wavelength emitted by a Tm-doped fiber laser system. In: Optics Letters, Vol. 43, No. 21: pp. 5178-5181
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We report on the generation of a high-power frequency comb in the 2 mu m 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 self-compression 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.