A newly developed fiber for use in pulse stretchers for chirped pulse amplifiers working in the 1 μm wavelength range of Yb fiber amplifiers is reported. The fiber has a record high numerical third order to second order dispersion β3/β2 ratio of −7.7 fs. The fiber has very good dispersion match to a grating compressor for second, third, and fourth order dispersion. By combining the stretcher fiber with an anomalous dispersion fiber working in a higher order mode, even higher β3/β2 ratio of −16.8 fs is demonstrated. The combined module shows very good dispersion match to a grating compressor.
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