Efficient optical parametric oscillation is demonstrated in periodically poled stoichiometric lithium tantalate crystal pumped by a mode-locked Ti:sapphire laser. The optical parametric oscillator (OPO) delivers a maximum average power of more than in signal and in idler beams. The OPO is continuously tunable across the wavelength range in its signal branch, delivering nearly transform-limited pulses. Despite the onset of high absorption loss in the crystal in the mid-IR, more than of power is obtained for the idler beam tunable within the wavelength range. The high parametric gain in the crystal allows tunable OPO operation at a repetition rate as high as with of output power.
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