Abstract

We present an original experiment describing a focused Gaussian laser beam by using second-harmonic generation (SHG) in a thin strip of a nonlinear optical material, in this case KTP doubling of an Nd:YAG laser at 1.064 μm. The dependence of the SHG efficiency on the fundamental beam radius allows the determination of beam parameters by harmonic-power measurements. The characterization of a telescope shows the good precision of this method in radii in the range of 10–100 μm. The average accuracy is 4% for the radius determination and 1.5% for the beam-waist localization.

© 1994 Optical Society of America

Relative sign and absolute magnitude of d⁽²⁾ nonlinear coefficients of KTP from second-harmonic-generation measurements

B. Boulanger, J. P. Fève, G. Marnier, B. Ménaert, X. Cabirol, P. Villeval, and C. Bonnin
J. Opt. Soc. Am. B 11(5) 750-757 (1994)

Absolute measurement of quadratic nonlinearities from phase-matched second-harmonic generation in a single KTP crystal cut as a sphere

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Efficient second-harmonic generation in KTP crystals

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Second-harmonic generation in biaxial crystals for a focused fundamental Gaussian laser beam: application to (–)2-α-(methylbenzylamino)- 5-nitropyridine single crystals

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