Gamma‐shaped long‐cavity normal‐dispersion mode‐locked Er‐fiber laser for sub‐nanosecond high‐energy pulsed generation

We propose the design of a novel γ‐shaped fiber laser resonator and apply it to build a long‐cavity normaldispersion mode‐locked Er‐fiber laser which features enhanced functionalities for management and optimization of pulsed lasing regimes. We report the generation of sub‐nanosecond pulses with the...

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Bibliographic Details
Published in:Laser physics letters 2012-01, Vol.9 (1), p.59-67
Main Authors: Nyushkov, B.N., Ivanenko, A.V., Kobtsev, S.M., Turitsyn, S.K., Mou, C., Zhang, L., Denisov, V.I., Pivtsov, V.S.
Format: Article
Language:English
Subjects:
ASE suppression
double‐pass fiber amplifier
gamma cavity
high pulse energy
low repetition rate
mode‐locked fiber laser
normal dispersion
sub‐nanosecond pulses
tilted fiber grating
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Summary:We propose the design of a novel γ‐shaped fiber laser resonator and apply it to build a long‐cavity normaldispersion mode‐locked Er‐fiber laser which features enhanced functionalities for management and optimization of pulsed lasing regimes. We report the generation of sub‐nanosecond pulses with the energy of ∼0.5 μJ at a kilohertz‐scale repetition rate in an all‐fiber system based on the new laser design. A combination of special design solutions in the laser, such as polarization instability compensation in the ultra‐long arm of the resonator, intra‐cavity spectral selection of radiation with a broadband fiber Bragg grating, and polarization selection by means of a tilted refractive index grating, ensures low amplified spontaneous emission (ASE) noise and high stability of the laser system output parameters. (© 2012 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)
ISSN:1612-2011
1612-202X
DOI:10.1002/lapl.201110088