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978-nm square-wave in an all-fiber single-mode ytterbium-doped fiber laser
Author(s): Shujie Li; Lixin Xu; Chun Gu
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Paper Abstract

A 978 nm single mode passively mode-locked all-fiber laser delivering square-wave pulses was demonstrated using a figure-8 cavity and a 75 cm commercial double-clad ytterbium-doped fiber. We found the three-level system near 978 nm was able to operate efficiently under clad pumping, simultaneously oscillation around 1030 nm well inhibited. The optimized nonlinear amplifying loop mirror made the mode locking stable and performed the square-pulses shaping. To the best of our knowledge, it is the first time to report the square-wave pulse fiber laser operating at 980 nm. The spectral width of the 978 mode-locked square pulses was about 4 nm, far greater than that of the mode-locked square pulses around 1060 nm reported before, which would be helpful to deeply understand the various square-wave pulses’ natures and forming mechanisms. Compared with modulated single-mode or multimode 980 nm LDs, this kind of 980 nm square-wave sources having higher brightness, more steeper rising and falling edge and shorter pulse width, might have potential applications in pumping nanosecond ytterbium or erbium fiber lasers and amplifiers.

Paper Details

Date Published: 12 January 2018
PDF: 8 pages
Proc. SPIE 10619, 2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 1061910 (12 January 2018); doi: 10.1117/12.2300538
Show Author Affiliations
Shujie Li, Univ. of Science and Technology of China (China)
Lixin Xu, Univ. of Science and Technology of China (China)
Chun Gu, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 10619:
2017 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications
Zhiyi Wei; Chunqing Gao; Pu Wang; Franz X. Kärtner; Jayanta Kumar Sahu; Liquan Dong, Editor(s)

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