Abstract
We report a switchable dual-wavelength fiber grating laser in linear overlapping cavity. The laser
features two overlapping cavities sharing a single Yb-doped gain medium fiber and two sets of fiber Bragg
gratings. A coiling fiber setup is inserted into the 1035 nm laser cavity. Given that the bending loss is
inversely related to the bending radius, the cavity loss of 1035-nm can be modulated. Modulating the bending
loss facilitates the switching of the fiber grating laser to a single-or dual-wavelength output at 1030 or
1035 nm and convenient tuning of the power ratio of the two wavelengths. An approximately 152.6-mW output
power and up to 38-dB polarization extinction ratio are observed. The simultaneous lasing at 1030 and 1035 nm
is a qualified seeder source for amplification to high power scale and can be applied to difference frequency
generation of a terahertz signal. This dual-wavelength fiber grating laser is a potential pump source for
generating terahertz radiation using a novel approach.
© 2013 Chinese Optics Letters
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