Applied Physics B

, 125:220 | Cite as

Evolutionary algorithm-assisted design of a UV SHG cavity with elliptical focusing to avoid crystal degradation

  • Daniel Preißler
  • Daniel Kiefer
  • Thorsten Führer
  • Thomas WaltherEmail author


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.



Funding by the Federal Ministry of Education and Research (BMBF) under Grant numbers 05P15RDFA1, 05P09RDFA3 and 05P12RDRB2 is gratefully acknowledged.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institut Für Angewandte Physik, Laser und QuantenoptikTechnische Universität DarmstadtDarmstadtGermany

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