title: Sub-50 fs Yb-doped laser with anomalous-dispersion photonic crystal fiber.
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.
authors.affiliation: Department of Physics, Bilkent University, Ankara, Turkey. zhang@fen.bilkent.edu.tr
authors.forename: Zuxing
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ç
authors.initials: Ç
authors.lastname: Şenel
authors.forename: R
authors.initials: R
authors.lastname: Hamid
authors.forename: F Ö
authors.initials: FÖ
authors.lastname: Ilday