Abstract
The frequency doubling of laser radiation at 1064 nm is studied in order to characterize efficient harmonic materials capable of delivering second-harmonic average power at the multiwatt level. Three nonlinear materials are considered: Mg:LiNbO3, potassium titanyl phosphate (KTP), and lithium triborate (LBO). No photoreactive damage is observed in Mg:LiNbO3; however, it exhibits broadening of the temperature tuning curves and distortion of the harmonic beam. An average output power in excess of three watts is extracted from KTP, but the material shows optically induced nonuniformities in the n(z) refractive index. LBO as a harmonic converter achieves 2.2 W at 532 nm, though the fundamental beam has to be tightly focused in the crystal.
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