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A record of 680-mW single-frequency red emission at 671.1 nm is demonstrated using a Nd:YVO4 ring laser intracavity frequency-doubled by a type-I critically phase-matched BiB3O6 crystal. Single-frequency tuning over ????red ~ 1.25 nm can be achieved with a thin etalon with reflectivity of 40%. At 1342.5 nm and with a T = 2% transmission output coupler, the laser provides an optimal 1.55 W of single-frequency...
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