We report a new source of cw, single-frequency radiation in the blue, offering extended tunability and practical powers in a compact, all-solid-state design. The device is based on a green-pumped, cw, singly resonant optical parametric oscillator using -doped stoichiometric lithium tantalate () as the nonlinear material. By internal second-harmonic generation of the resonant near-infrared signal radiation in a crystal, we generate nearly of cw, single-frequency blue power over a tunable range of with a linewidth of and a Gaussian spatial beam profile. The demonstrated wavelength coverage can be further extended by using alternative gratings for the crystal.
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