We demonstrate for the first time the generation of yellow-green laser at 561 nm in critically type-I phase matching LBO with intracavity frequency doubling of a diode-pumped Nd:YAG laser operated at 1123 nm under room temperature in a compact three-fold cavity. As high as 1.2 W of continuous wave output at 561 nm is achieved with an incident pump power of 10 W. The total optical to optical conversion efficiency is up to 13.3% and the stability of output power is better than 3% in 3 h. To the best of our knowledge, this is the first Watt-level 561 nm yellow laser generation by frequency doubling of Nd:YAG laser. Wavelength, nm

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