Abstract
Long-term laser operation in the UV by frequency doubling in BBO is often limited due to degradation effects. We theoretically investigate the impact of elliptical focusing on the fundamental peak intensity to reduce the risk of crystal damage. After choosing a suitable elliptical Gaussian mode allowing for significantly lower fundamental peak intensity without sacrificing second harmonic output power, we describe an optimisation algorithm to find a stable resonator with cylindrical mirrors to ensure an elliptical focus with the specific beam waists inside the crystal. Experimental results achieved with this cavity are discussed.
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