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Proceedings Paper

High-efficiency fourth harmonic generation
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Paper Abstract

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.

Paper Details

Date Published: 10 April 1995
PDF: 17 pages
Proc. SPIE 2379, Solid State Lasers and Nonlinear Crystals, (10 April 1995); doi: 10.1117/12.206499
Show Author Affiliations
Jeffrey W. Pierce, Cygnus Laser Corp. (United States)
Raymond G. Beausoleil, Cygnus Laser Corp. (United States)

Published in SPIE Proceedings Vol. 2379:
Solid State Lasers and Nonlinear Crystals
Gregory J. Quarles; Leon Esterowitz; Lap Kin Cheng, Editor(s)

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