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Proceedings Paper

Observation of damage in PPLN
Author(s): David H. Titterton; Jonathan A. C. Terry; Daniel H. Thorne; Ian R. Jones; D. Legge
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Paper Abstract

Periodically-poled lithium niobate (PPLN) has been used to convert the 1.064 micrometer emission from a diode-pumped Nd:YAG laser to give an emission close to 4 micrometer. An acousto-optical Q-switch was used for generating short- duration, high-intensity pulses. Modulated waveforms are possible via direct modulation of the diode sources. A simple OPO configuration has been used with a resonated signal beam passing through a PPLN crystal in an oven. The pump beam has good beam quality, having an M2 of about 1.8 in each axis, and modulated average power in excess of 6 W. Damage has been observed to the output face of PPLN crystals over a range of pumping conditions and OPO configurations. The estimated damage threshold has been surprisingly low, of the order of 1.5 J/cm2. First observations indicated the damage occurring consistently at the output face of the crystal, but further analysis has indicated the presence of bulk damage, typically starting at domain boundaries.

Paper Details

Date Published: 1 May 2001
PDF: 9 pages
Proc. SPIE 4268, Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials, (1 May 2001); doi: 10.1117/12.424631
Show Author Affiliations
David H. Titterton, Defence Evaluation and Research Agency Farnborough (United Kingdom)
Jonathan A. C. Terry, Defence Evaluation and Research Agency Malvern (United Kingdom)
Daniel H. Thorne, BAE Systems (United Kingdom)
Ian R. Jones, BAE Systems (United Kingdom)
D. Legge, BAE Systems (United Kingdom)

Published in SPIE Proceedings Vol. 4268:
Growth, Fabrication, Devices, and Applications of Laser and Nonlinear Materials
Jeffrey W. Pierce; Kathleen I. Schaffers; Kathleen I. Schaffers, Editor(s)

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