Quasi-phase-matched second-harmonic generation of 532 nm radiation in 25-degree-rotated, x-cut, near-stoichiometric, lithium tantalate fabricated by vapor transport equilibration

Quasi-phase-matched second-harmonic generation of 532 nm radiation in 25°-rotated, x-cut, near- stoichiometric lithium tantalate has been performed. Using a face-normal topology for frequency conversion applications allows scalable surface area to avoid surface and volume damage in high-power interactions. First-order, quasi-phase-matched second-harmonic generation was achieved using near-stoichiometric lithium tantalate fabricated by vapor transport equilibration. These crystals supported 1 J of 1064 nm radiation and generated 21 mJ of 532 nm radiation from a 7 ns, Q-switched Nd : YAG laser within a factor of 4.2 of expectation.