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An all-fiber linearly polarized Yb  3+  -doped double-clad fiber laser is proposed, in which the resonance cavity is composed of a pair of polarization-maintaining fiber Bragg gratings (PM-FBGs). The polarization hole burning is enhanced by the selective polarization feedback by the PM-FBGs. A three-port polarization beam splitter with fiber pigtail is inserted into the laser cavity to select different polarization states. The laser features wavelength of 1,069.72 and 1,069.98 nm, output power of 128 mW and signal-to-noise ratio (SNR) of 45 dB. The quasiphase-matched periodically poled lithium niobate (PPLN) crystal was used to obtain a frequency-doubled green laser, with a pump power of 128 mW, and a 21.9-mW output power is achieved.

All-Fiber Linearly Polarized Wavelength-Selectable Yb 3+ -Doped Double-Clad Fiber Laser Yielding Green Second Harmonics