A LiNbO3optical parametric oscillator has been temperature tuned over the wavelength range of 7300 A˚ to 19,300 A˚. Total output powers of the order of 103W were observed with pump powers at 5300 A˚ of about 105W. Experimental data illustrate the pronounced dependence of the generated frequencies on the pump frequency and the longitudinal mode distribution of the resonator. A proposal is described for quasicontinuous tuning of the output frequencies by means of the linear electro‐optic effect in the oscillator crystal.