Abstract

The azimuthal dependence of third-order and cascaded second-order nonlinear coupling was used to measure the relative contributions of each to direct third-harmonic generation in β-barium borate. This permitted the measurement of the values of tensor elements χ103, χ113, and χ163 relative to the known χij2. Finally, conversion efficiencies to 3ω of up to 6% were achieved with a femtosecond chirped-pulse amplification laser with 200 GW/cm2 in collimated beams.

© 1999 Optical Society of America

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