Kuan WH, Kao LT, Wang JY, Lin KH. Femto/nano-second switchable passively mode-locked fiber laser with analytic modeling by the cubic-quintic Ginzburg-Landau equation.
OPTICS LETTERS 2018;
43:341-344. [PMID:
29328276 DOI:
10.1364/ol.43.000341]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 12/09/2017] [Indexed: 06/07/2023]
Abstract
We report a passively mode-locked erbium-doped fiber laser with pulse widths switchable from 473 fs to 76.8 ns, where the fundamental mode-locking, noise-like pulse, nanosecond mode-locking, and dual-width mode-locking (DML) are obtained by adjusting a polarization controller. Co-existence of femto- and nano-second pulses in DML is attributed to the gain balancing. Analytic modeling of the fiber laser with the cubic-quintic Ginzburg-Landau equation is presented, in which the pulse widths are calculated as functions of dispersion, self-phase modulation (SPM), cubic saturable absorption (SA), and quintic SA. The generation of nanosecond pulses is caused by the weakened intracavity pulse-shortening strength, the reduced effective SPM, and the inclusion of quintic SA in the laser cavity.
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