Sub-50 fs Yb-doped laser with anomalous-dispersion photonic crystal fiber

Zhang, Zuxing, Şenel, Ç., Hamid, R. and Ilday, F.Ö. (2013). Sub-50 fs Yb-doped laser with anomalous-dispersion photonic crystal fiber. Optics Letters, 38 (6), pp. 956-958.

Abstract

We report on the generation of 42 fs pulses at 1 µm in a completely fiber-integrated format, which are, to the best of our knowledge, the shortest from all-fiber-integrated Yb-doped fiber lasers to date. The ring fiber cavity incorporates anomalous-dispersion, solid-core photonic crystal fiber with low birefringence, which acts as a broadband, in-fiber Lyot filter to facilitate mode locking. The oscillator operates in the stretched-pulse regime under slight normal net cavity dispersion. The cavity generates 4.7 ps long pulses with a spectral bandwidth of 58.2 nm, which are dechirped to 42 fs via a grating pair compressor outside of the cavity. Relative intensity noise (RIN) of the laser is characterized, with the integrated RIN found to be 0.026% in the 3 Hz-250 kHz frequency range.

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