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Self-compression in a solid fiber to 24  MW peak power with few-cycle pulses at 2  μm wavelength

: Gaida, C.; Gebhardt, M.; Tutzki, F.S.; Jauregui, C.; Limpert, J.; Tünnermann, A.


Optics Letters 40 (2015), Nr.22, S.5160-5163
ISSN: 0146-9592
Fraunhofer IOF ()

We report on the experimental realization of a compact, fiber-based, ultrashort-pulse laser system in the 2 μm wavelength region delivering 24 fs pulse duration with 24 MW pulse peak power and 24.6 W average power. This performance level has been enabled by the favorable quadratic wavelength-dependence of the self-focusing limit, which has been experimentally verified to be at approximately 24 MW for circular polarization in a solid-core fused-silica fiber operated at a wavelength around 2 μm. The anomalous dispersion in this wavelength region allows for a simultaneous nonlinear spectral broadening and temporal pulse compression. This makes an additional compression stage redundant and facilitates a very simple and power-scalable approach. Simulations that include both the nonlinear pulse evolution and the transverse optical Kerr effect support the experimental results.