
Improvements in the efficiency of cw second harmonic generation (SHG) and cw optical parametric oscillation depend on the ratio of the nonlinearity to the loss in the nonlinear medium. External resonant SHG in monolithic lithium niobate crystals has now reached 69% conversion efficiency. Progress for SHG to the ultraviolet in barium borate and for cw OPO operation will be reviewed.
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