561 nm yellow laser with high stability and low noise

In view of current high noise of domestic 561 nm laser, affecting its practicality, 561 nm yellow laser with high stability and low noise is proposed. Nd:YAG crystal is used to obtain 1 123 nm fundamental frequency light, and output of LBO crystal is 561 nm. Threshold pump power of 1 112 nm, 1 116 nm and 1 123 nm wavelength is analyzed theoretically, and a single wavelength oscillation condition of 1 123 nm is proposed to determine requirements of resonant cavity coating. According to theoretical calculation, a reasonable resonant cavity system is designed, and single-wavelength oscillation of 1 123 nm line is realized by suppressing oscillation of 1 112 nm and 1 116 nm lines in the resonator. At a pump power of 5 W, 561 nm laser single wavelength output is achieved with an output power of 107 mW, power instability of 0.7% and noise of 1.2%.