Abstract

Frequency doubling in periodically poled KTiOPO4 excited by the Bessel-like distribution of the fundamental radiation has been investigated. Theoretical analysis and experiments show that the use of noncollinear geometry provides new possibilities for engineering nonlinear interactions in periodically poled crystals. We demonstrate conversion of the ring-shaped fundamental mode to the axial second-harmonic beam with 30% efficiency for 220µJ Q-switched Nd:YAG pulses.

© 1999 Optical Society of America

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