We report a compact diode-laser pumped Nd:GdVO(4) laser with stable dual-wavelength output at 1063 nm and 1065 nm simultaneously. Two types of resonant cavity configurations were presented to support the stable dual-wavelength operation of the laser. Using a polarization beam splitter(PBS) included T-shaped cavity, we obtained a total power output over 5 W in two orthogonal polarized beam directions with 4 W in sigma polarization (1065.5 nm) and 1 W in pi polarization (1063.1 nm). By combining a half-wave-plate with the PBS in the laser cavity, a new configuration favoring one beam direction dual-wavelength output with same polarization direction was realized. A phenomenon of further line splitting was observed in both 1065 nm and 1063 nm.

Abstract:We report experimental results on an all-fiberized linearly polarized single-mode pulse Yb-doped fiber laser/amplifier working at 1064 nm. Using a fiberized acousto-optic Qswitched ytterbium fiber laser as the seed source, a double-clad polarization-maintaining fiber as the gain medium, a (6+1)×1 multimode pump combiner to input the seed signal and the pump power, an Yb fiber master oscillator power amplifier (MOPA) is demonstrated. It delivers a linearly polarized pulsed laser output working at 1064 nm with an average power of 30 W, a repetition rate of 40 kHz, a pulse duration time about 30 ns, a polarization extinction ratio greater than 10 dB, and a beam quality factor (M 2 ) of 1.36. Our experiments were pump-power limited and considerable scope remains for further power-scaling of such fiber MOPA using this approach. [5]. High power single-mode pulsed fiber laser with multi10ns pulses can find a wide variety of applications in material processing, laser radar, remote sensing and nonlinear frequency conversion, etc. Its advantages such as good beam quality, high efficiency, excellent heat dissipation capability, and compactness make the pulsed Yb-doped fiber lasers and/or amplifiers superior to conventional bulk solid-state lasers and gas lasers [6]. As many applications require polarization maintain (PM) operation, there is a great interest in making these pulsed fiber lasers and amplifiers linearly polarized [7,8].By applying double-clad fibers, output power of continuous-wave fiber lasers has approached kW-regime [9]. However, the power-scaling of pulsed fiber lasers is much more difficult, because of strong deleterious nonlinear effects within the fiber, such as stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS), which usually constitute the main performance limitation of the pulsed fiber laser systems [10,11]. Since the thresholds of SBS and SRS in PM fibers are much lower than in non-PM fibers [12], the operation of linearly polarized pulsed fiber lasers and amplifiers is more challenging. Several linearly polarized pulse fiber lasers and amplifiers have recently been reported [13,14]. By adjusting the power and repetition rate of the seed to suppress the nonlinear phenomenon, an acousto-optic(AO) Q-switched Nd:YVO4 laser seeded ytterbium fiber master oscillator power amplifier (MOPA) achieved linearly polarized output power of 50 W [15]. Using a pulse shaping technology, some authors of this paper also demonstrated a diode seeded high power linearly-polarized Yb fiber MOPA with

Abstract:We report an acousto-optic (AO) Q-switched fiber laser with linearly polarized short pulse output. The fiber laser was set up by applying a piece of large mode area polarization maintaining Yb fiber of 1 meter length as the gain medium and a free-space AO Q-switch as the modulating element. The fiber laser was pumped by a fiber pigtailed laser diode working at 976 nm. By suitably adjusting the distance between the AO Qswitch and the cavity mirror, stable Q-switched short pulse laser output was achieved with output power up to 10 W and repetition rate between 20 kHz and 50 kHz. The shortest pulse duration of 33 ns was achieved at repetition rate of 20 kHz when the output power reached about 10 W.

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