High pulse energy and symmetrical far field from an optical parametric oscillator in the red spectral range

Red pulses with >30 mJ energy and <0.6 nm bandwidth have been demonstrated using a type 2 phase matched optical parametric oscillator pumped at 532 nm. A symmetrical signal beam with beam diameter-divergence product of ~3 mm•mrad was obtained by applying KTA and BBO crystals in the same resonato