A widely tunable continuous intracavity-frequency-doubled singly resonant optical parametric oscillator based on -doped periodically poled stoichiometric lithium tantalate crystal is described. The idler radiation resonating in the cavity is frequency doubled by an intracavity BBO crystal. Pumped in the green, this system can provide up to of single-frequency orange radiation. The system is continuously temperature tunable between 1170 and for the idler, 876 and for the signal, and between 585 and for the doubled idler. The free-running power and frequency stability of the system have been observed to be better than those for a single-mode dye laser.
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