Sub-250 fs passively mode-locked ultralong ring fibre oscillators

•Fibre master oscillator achieving peak powers above 1 MW with pulses in the fs range.•Low-cost polarisation-independent harmonically mode-locked ultralong ring fibre laser.•Applicable in high peak power-demanding applications as materials processing. We report the experimental demonstration of a si...

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Bibliographic Details
Published in:Optics and laser technology 2021-06, Vol.138, p.106848, Article 106848
Main Authors: Gallazzi, F., Jimenez-Rodriguez, M., Monroy, E., Corredera, P., González-Herráez, M., Naranjo, F.B., Castañón, J.D. Ania
Format: Article
Language:English
Subjects:
Amplification
Engineering Sciences
Fiber lasers
Materials processing
Mode locking
Oscillators
Physics
Supercontinuum generation
Ultrafast fibre lasers
Ultralong fibre lasers
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Summary:•Fibre master oscillator achieving peak powers above 1 MW with pulses in the fs range.•Low-cost polarisation-independent harmonically mode-locked ultralong ring fibre laser.•Applicable in high peak power-demanding applications as materials processing. We report the experimental demonstration of a simple passive ultrafast harmonically mode-locked ultralong ring fibre laser architecture using InN-based semiconductor saturable absorber mirrors (SESAMs) that allows for the generation of high peak power ultrashort pulses without the need for external amplification stages. Fundamental mode-locking of the resonator in 1.67 to 2.37 km rings, emitting at 1.56 μm results in pulse widths below 250 fs, with repetition rates between 87 and 124 kHz, pulse energies above 200 nJ and peak powers between 1.0 and 1.27 MW, that could meet the requirements for high peak power demanding applications such as materials processing without additional amplification or compression stages.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2020.106848