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10 April 1995 High-efficiency fourth harmonic generation
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The technique of Type I quadrature doubling has been used to generate 266 nm output from 532 nm input. Using a simple flashlamp pumped Nd:YAG laser doubled in KTP, the best conversion efficiency from the second harmonic to the fourth harmonic was 42% using two KDP crystals. With a second harmonic conversion efficiency of 60%, the total conversion efficiency from 1.064 micrometers to 266 nm was 25%. Output energies at 266 nm of up to 11.5 mJ in a nearly diffraction-limited beam, and 22 mJ in a multimode beam, were obtained, limited by the pump laser. The transient nonlinear absorption of 266 nm induced in the KDP crystals was measured in our samples, and the effect was accurately modelled to predict performance of a harmonic conversion system using improved nonlinear crystals.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey W. Pierce and Raymond G. Beausoleil "High-efficiency fourth harmonic generation", Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995);

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