Generation of bright squeezed light at 1.06 mu m using cascaded nonlinearities in a triply resonant cw periodically-poled lithium niobate optical parametric oscillator - art. no. 033815

摘要

We have used an ultralow threshold continuous-wave optical parametric oscillator (OPO) to reduce the quantum fluctuations of the reflected pump beam below the shot noise limit. The OPO consisted of a triply resonant cavity containing a periodically poled lithium niobate crystal pumped by a Nd:YAG (yttrium. aluminum garnets) laser and giving signal and idler wavelengths close to 2.12 mum and a threshold as low as 300 muW. We detected the quantum fluctuations of the pump beam reflected by the OPO using a slightly modified homodyne detection technique. The measured noise reduction was 30% (inferred noise reduction at the output of the OPO 38%). [References: 22]