Fabrication of a D-shaped fiber by femtosecond laser-induced water breakdown for carbon nanotubes' evanescent field interaction mode-locking of a double-clad fiber laser

A D-shaped fiber was fabricated by femtosecond laser-induced water breakdown for a fiber laser mode-locked by the evanescent field interaction of carbon nanotubes. Then a mode-locked double-clad fiber laser was constructed using the D-shaped fiber with carbon nanotubes as a saturable absorber and an...

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Bibliographic Details
Published in:Laser physics 2013-08, Vol.23 (8), p.85110
Main Authors: Pan, Y Z, Liu, W J, Tian, Z S, Wang, S S, Su, X H, Liu, Y, Qu, S L
Format: Article
Language:English
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Summary:A D-shaped fiber was fabricated by femtosecond laser-induced water breakdown for a fiber laser mode-locked by the evanescent field interaction of carbon nanotubes. Then a mode-locked double-clad fiber laser was constructed using the D-shaped fiber with carbon nanotubes as a saturable absorber and an ytterbium-doped double-clad fiber pumped by a 915 nm fiber coupled multimode laser diode as an amplifying medium. Stable mode-locked operation at 1.07 μm was achieved with a full width at half maximum of 18.1 nm. The output pulses had a repetition rate of 5.76 MHz with a pulse duration of 136.2 fs. The energy per pulse was 52.5 nJ and the slope efficiency was about 11%.
ISSN:1054-660X
1555-6611
DOI:10.1088/1054-660X/23/8/085110