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We report on efficient generation of second harmonic laser and single-modevacuum squeezed light of 795 nm with periodically poled KTiOPO4 (PPKTP)crystals. We achieved 111 mW of ultra-violet (UV) light at 397.5 nm from 191 mWof fundamental light with a PPKTP crystal in a doubling cavity, correspondingto a conversion efficiency of 58.1%. Using the UV light to pump an opticalparametric oscillator with a PPKTP crystal, we realized -5.6 dB of a maximumsqueezing. We analyzed the pump power dependence of the squeezing level andconcluded that the UV light induced losses limit the improvement of thesqueezing level. The generated squeezed light has huge potential application inquantum memory and ultra-precise measurement.

Improvement of vacuum squeezing resonant on the rubidium D1 line at 795 nm