Abstract

When using type II frequency-doubling in KDP with pulses shorter than “2 ps, group velocity dispersion limits the maximum conversion efficiency since the three interacting waves become physically separated after passing <1 cm through the crystal. Energy conversion efficiencies are, thus, <40% for l-μm 1-ps pulses at an optimum input intensity of ≈4GW/cm¹. Above this optimum, the energy conversion efficiency decreases because of reconversion of the second harmonic back into the fundamental.

© 1992 Optical Society of America