Abstract
Abstract A noncritically phase-matched second harmonic generation (SHG) of 532 nm radiation from 1064 nm radiation in LiNbO3 doped with 2 mol% MgO has been investigated by using a Q-switched Nd:YAG laser with a pulse duration of 52 ns. SHG conversion efficiencies of 50% were typically achieved with a 10.3 mm long crystal and a fundamental peak-power density of 32 MW/cm2. It was found that any optical index inhomogeneities were not induced for more than 2 h operation of SHG under the fundamental power density of 32 MW/cm2.
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