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Laser intensity noise suppression has essential effects on preparation andcharacterization of the audio-frequency squeezed vacuum state of light based ona sub-threshold optical parametric oscillator (OPO).We have implemented twofeedback loops by using relevant acousto-optical modulators (AOM) to stabilizethe intensity of 795-nm near infrared (NIR) fundamental laser and 397.5-nmultraviolet (UV) laser generated by cavity-enhanced frequency doubling.Typicalpeak-to-peak laser intensity fluctuation with a bandwidth of $\sim10$ kHz in ahalf hour has been improved from $\pm7.45$$\%$ to $\pm0.06$$\%$ for 795-nm NIRlaser beam, and from $\pm9.04$$\%$ to $\pm0.05$$\%$ for 397.5-nm UV laser beam,respectively. The squeezing level of the squeezed vacuum state at 795 nmprepared by the sub-threshold OPO with a PPKTP crystal has been improved from-3.3 to -4.0 dB around 3$\sim$9 kHz of audio analysis frequency range.

Laser Intensity Noise Suppression for Preparing Audio-Frequency 795 nm Squeezed Vacuum State of Light at Rubidium D1 Line