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

 
: 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.

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Fulltext ()

Optics Letters 43 (2018), No.21, pp.5178-5181
ISSN: 0146-9592
English
Journal Article, Electronic Publication
Fraunhofer IOF ()

Abstract
We report on the generation of a high-power frequency comb in the 2 μm 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.

: http://publica.fraunhofer.de/documents/N-555571.html