Experimental Characterization Of Quantum Correlated Quadruple Beams Generated By Cascaded Four-wave-mixing Processes

In this thesis,the experimental characterization of quantum correlated quadruple beams gener-ated by cascaded four-wave-mixing processes is discussed.The production of quantum correlated quadruple beams is based on four-wave-mixing process.The output beams are quantum correlated,which is shown by that noise in the twin beams are both amplified but in their subtraction,noise is dramatically reduced.The noise reduction can be quantified by the degree of squeezing.Besides,to get better squeezed beams,the phase-matching conditions must be taken into account.Next,the experimental configuration is shown as well as the experimental processes to mea-sure the experimental characterization of quantum correlated quadruple beams.And a theoretical model of the cascaded four-wave-mixing processes is also created to calculate the theoretical re-sult.After that,the dependence of quantum correlation on cell temperature,one-photon detuning,two-photon detuning and the power of pump beams is relatively measured.The experimental measured results are shown and they are also compared with the theoretically calculated ones,and their difference is analyzed,and the best point where the maximum quantum correlation is also obtained.In the latter part of this thesis,another work in my career,laser locking based on DAVLL system,is shown.