Abstract
We report the generation of high average output power, high peak power, and high pulse energy radially polarized picosecond pulses from a compact gain-switched laser-diode-seeded Yb-doped fiber master oscillator power amplifier (MOPA) system. A q-plate was employed as a mode converter prior to the final power amplifier to efficiently convert the linearly polarized Gaussian-shaped beam into a donut-shaped radially polarized beam. The desired vector beam was efficiently amplified yielding ∼110 ps pulses with a maximum output pulse energy of ∼30.7 μJ and a peak power of ∼280 kW at a repetition rate of 1.367MHz. The average power was scaled up to 106W by increasing the repetition rate to 5.468MHz.
Highlights
Received XX Month XXXX; revised XX Month, XXXX; accepted XX Month XXXX; posted XX Month XXXX
We recently demonstrated the efficient generation of Cylindrical vector beams (CVBs) from YDF lasers and amplifiers based on conventional few-mode YDFs operating at several tens of watts of average output power in both CW and pulsed modes by employing a nano-grating based spatially variant half-waveplate in the laser cavity/amplifier chain, achieving comparable optical efficiencies to more conventional YDF systems [9,10,11]
Further power scaling is of interest and the YDF-MOPA architecture, which has previously been demonstrated to provide a compact and robust approach to amplify picosecond pulses to the hundreds of watts of average output power level with diffractionlimited beam [12], represents a promising way to generate high performance, high power CVBs in the picosecond regime
Summary
Received XX Month XXXX; revised XX Month, XXXX; accepted XX Month XXXX; posted XX Month XXXX We report a gain-switched laser-diode-seeded YDFMOPA system capable of generating picosecond pulses with high pulse energy, high peak power and narrow bandwidth in a radially polarized beam at average powers in excess of 100W.
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