Intracavity Frequency Doubling Of A Diode Pumped Nd:YAG Laser Using A KNbO3 Crystal

Ivan Biaggio; Herbert Looser; Peter Gunter

doi:10.1117/12.949971

8 March 1989 Intracavity Frequency Doubling Of A Diode Pumped Nd:YAG Laser Using A KNbO3 Crystal

Ivan Biaggio, Herbert Looser, Peter Gunter

Proceedings Volume 1017, Nonlinear Optical Materials; (1989) https://doi.org/10.1117/12.949971
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

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.

Citation Download Citation

Ivan Biaggio, Herbert Looser, and Peter Gunter "Intracavity Frequency Doubling Of A Diode Pumped Nd:YAG Laser Using A KNbO3 Crystal", Proc. SPIE 1017, Nonlinear Optical Materials, (8 March 1989); https://doi.org/10.1117/12.949971

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