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High-repetition-rate and high-power picosecond regenerative amplifier based on a single bulk Nd:GdVO4 crystal
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- Journal:
- High Power Laser Science and Engineering / Volume 7 / 2019
- Published online by Cambridge University Press:
- 13 June 2019, e35
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- Article
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We report on a high-repetition-rate, high-power continuously pumped Nd:GdVO4 regenerative amplifier. Numerical simulations successfully pinpoint the optimum working point free of bifurcation instability with simultaneous efficient energy extraction. At a repetition rate of 100 kHz, a maximum output power of 23 W was obtained with a pulse duration of 27 ps, corresponding to a pulse energy of
$230~\unicode[STIX]{x03BC}\text{J}$. The system displayed an outstanding stability with a root mean square power noise as low as 0.3%. The geometry of the optical resonator and the pumping scheme enhanced output power in the 
$\text{TEM}_{00}$ mode with a single bulk crystal. Accordingly, nearly diffraction-limited beam quality was produced with 
$M^{2}\approx 1.2$ at full pump power.
