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2 Many other forms of the fiber lasers have also been investigated, such as single-frequency lasers,3 mode-locked lasers with femtosecond pulse width,4 and wavelength-tunable lasers.5 In this Letter we propose and demonstrate a new use of the fiber laser as a fiber sensor based on the beating of two mutually orthogonal eigenpolarization modes in the fiber laser cavity. Although a small birefringence in the fiber laser cavity does not affect the AfL, it can cause a serious broadening of Afp when the optical bandwidth is broad and many longitudinal modes are lasing for each polarization modes.
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