Efficient conversion of picosecond laser pulses into second-harmonic frequency using group-velocity dispersion
Yanjie WangLaser Physics Centre, Research School of Physical Sciences, The Australian National University, P.O. Box 4, Canberra, Australian Capital Territory 2601, AustraliaR. DragilaLaser Physics Centre, Research School of Physical Sciences, The Australian National University, P.O. Box 4, Canberra, Australian Capital Territory 2601, Australia
1990en
ABI
Abstract
A computer model has been used to investigate frequency doubling of 1-psec duration high-power pulses in potassium dihydrogen phosphate (KDP) for type-II phase matching. It has been found that group-velocity dispersion can be used to advantage by predelaying the ordinary and extraordinary polarizations appropriately in a thin KDP crystal with its axes aligned at 90\ifmmode^\circ\else\textdegree\fi{} to the main conversion crystal. In that situation power conversion >100% from the fundamental to the second harmonic can be obtained with simultaneous ``compression'' of the output pulse duration by up to a factor of 5.
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