Abstract

Major practical requirements relevant to achieving high conversion efficiencies in optical parametric oscillators have been identified. In particular, an experimental comparison has been made between critically and noncritically phase-matched geometries in beta-barium borate (BBO) and lithium triborate (LBO), respectively, when they are pumped by an excimer laser at 308 nm. We report pump depletions of 40% in LBO and 50% in BBO when 385- and 1540-nm radiation is parametrically generated. Pump depletions of 64% have been obtained in BBO when 540- and 700-nm radiation is generated. Optimization of external efficiencies has been studied, and values of 30% have been obtained in LBO by resonating the low-energy wave.

© 1991 Optical Society of America

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