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Proceedings Paper

Intracavity Frequency Doubling Of A Diode Pumped Nd:YAG Laser Using A KNbO3 Crystal
Author(s): Ivan Biaggio; Herbert Looser; Peter Gunter
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Paper Abstract

In this paper we present first results on intracavity frequency doubling of a diode-pumped Nd:YAG laser at λ=1.064 gm with single domain KNbO3 crystals. Potassium niobate, with its large nonlinear optical coefficients, is well suited for efficient frequency doubling of light from various near infrared lasers. Using the coefficient d31=-15.8 pm/V the second harmonic of the Nd:YAG wavelength (= 1064 nm) can be generated. Non critical 90° type I phase matching can be achieved by heating the crystal to a temperature of 188°C. The width at half maximum of the temperature tuning curve was measured to be 0.5°C. For the frequency doubling experiments reported here we mounted the 6.2 mm long KNbO3 crystal in a small, temperature stabilized oven at the center of a 10cm long confocal resonator. The mirrors had a reflectivity at 1064 nm of 99.5%. One mirror was used as an output coupler for the frequency doubled radiation (Transmission factor of 80% at λ=532 nm). An end pumped configuration was used. The pump radiation, with a wavelength of 810 nm was focused through the other mirror in a 5 mm long Nd:YAG rod. An output power of 2 mW at λ=532 nm has been measured for a laser diode power of 200 mW.

Paper Details

Date Published: 8 March 1989
PDF: 3 pages
Proc. SPIE 1017, Nonlinear Optical Materials, (8 March 1989); doi: 10.1117/12.949971
Show Author Affiliations
Ivan Biaggio, Swiss Federal Institute of Technology (Switzerland)
Herbert Looser, Swiss Federal Institute of Technology (Switzerland)
Peter Gunter, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 1017:
Nonlinear Optical Materials
Gerald Roosen, Editor(s)

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