Abstract
Self-starting and stable mode-locking of an Yb:KYW laser in the picoseconds pulse regime has been achieved by exploiting a positive cascaded Kerr lens in periodically poled KTP. The use of a volume Bragg grating (VBG), for locking the output spectrum of the laser, was essential to achieve a stable mode-locked operation in this wide gain bandwidth laser material. The laser emitted stable, nearly transform-limited pulses with a duration of 16 ps, at a repetition rate of 210 MHz, and with an energy of 3.2 nJ. The mode-locked spectrum was centred at 1,029.1 nm and featured a FWHM bandwidth of 85 pm, which was effectively determined by the VBG. Combination of a large cascaded Kerr nonlinearity with spectral limiting by a VBG represents so far the best opportunity for stable mode-locking of a broadband laser to produce near-transform-limited picosecond pulses.
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This work was supported by the Swedish Research Council (VR) through its Linnæus Center of Excellence ADOPT.
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Meiser, N., Seger, K., Pasiskevicius, V. et al. Cascaded mode-locking of a spectrally controlled Yb:KYW laser. Appl. Phys. B 116, 493–499 (2014). https://doi.org/10.1007/s00340-013-5725-6
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DOI: https://doi.org/10.1007/s00340-013-5725-6