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Proceedings Paper

Influence of mechanical stress on the conversion efficiency of KTP and LBO
Author(s): Guido Mann; Stefan Seidel; Horst Weber
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Paper Abstract

The efficiency of high-average-power frequency doubling is always limited by thermal effects inside the nonlinear crystal. Usually it is assumed that the limitation is caused by a change of the index of refraction due to the temperature variation inside the crystal. This effect is characterized by the temperature acceptance of the nonlinear crystal. Additionally, the temperature distribution inside the crystal produces thermally induced mechanical stress that leads to phase mismatch due to the photoelastic effect. Depending on the sign, this effect will decrease or increase the conversion efficiency. In order to investigate the influence of stress- induced phase mismatch independently of phase mismatch caused by a temperature variation on the conversion efficiency, KTP (Type II) and LBO (Type I) crystals for second-harmonic generation (SHG) of 1064 nm radiation were temperature- stabilized and mechanical stress was applied along different crystal axes. The conversion efficiency of a weak probe beam was measured as a function of the stress.

Paper Details

Date Published: 9 September 1999
PDF: 9 pages
Proc. SPIE 3823, Laser Metrology and Inspection, (9 September 1999); doi: 10.1117/12.360977
Show Author Affiliations
Guido Mann, Technische Univ. Berlin (Germany)
Stefan Seidel, Laser- und Medizin-Technologie gGmbH (Germany)
Horst Weber, Technische Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 3823:
Laser Metrology and Inspection
Hans J. Tiziani; Pramod Kumar Rastogi, Editor(s)

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