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An efficient single resonant extracavity parametric oscillator (OPO) is demonstrated based on a type Ⅱ noncritical phase matching KTA crystal (5 mm×5 mm×25 mm,θ=90°,φ=0°).A diode pumped Q-switched Nd∶YAG laser with a near TEM(00)mode at the repletion rate of 100 Hz is used as the pump laser.Under a pump power of 0.6 W and a pulse width of 13 ns,the average power of 86 mW at 3.467 μm is obtained with the pulse width of 6 ns and repetition rate of 100 Hz,corresponding to a conversion efficiency as high as 14% from 1.064 μm to 3.467 μm.The beam spatial profile for 3.467 μm is near TEM(00) mode.The average power of 123 mW is also obtained with a multi-transverse mode at the repetition rate of 200 Hz and an average power of 2.3 W of the pump laser.It is found that the conversion efficiency of the 3.467 μm laser descends a lot and the beam quality of the 3.467 μm laser becomes worse when the transverse distribution of the pump laser becomes worse.