Abstract
We report a compact high average power optical parametric oscillator(OPO) pumped by an all-solid-state nanosecond 532-nm laser. Based onthe merit of non-critically phase-matched crystals without walk-offeffect, a 60-mm-long LiB3O5 (LBO) crystal is used as theOPO nonlinear crystal to enhance the conversion efficiency and toincrease the output power. The maximum average power of signal outputis up to 18 W at 860 nm for pump power of 65 W. This is the highestsignal average power generated by a nanosecond OPO in single bulk LBO,to the best of our knowledge. The dynamic characteristics of beamquality are investigated. Our experimental results demonstrate thatgood OPO conversion efficiency and high output power can be obtainedeven with relatively poor pump beam quality.
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