Abstract
A short distributed feedback fiber laser with a nearly unidirectional output is
fabricated and tested. The short fiber laser is made of a polarization-dependent phase-shift grating
fabricated with a vertically polarized 244-nm ultraviolet (UV) laser. A single π phase-shift is
introduced to a 2-cm grating at a specified position by directly moving the phase mask during UV
beam scanning. Test results show that the laser has a single polarization longitudinal mode with
2.6-mW pump threshold. The backward-to- forward output power ratio is approximately 30:1. The
relative intensity noise is -88 dB/Hz, and the linewidth is approximately 10 kHz at 75-mW 980-nm
pumping. The unidirectional output and short dimension of this short fiber laser make it very useful
in sensing applications, especially in multiplexed sensing applications.
© 2013 Chinese Optics Letters
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