High-efficiency Optical Wavelength Conversion Based on Double Λ Four-wave Mixing

Abstract

In this thesis we use cold rubidium atoms to study backward four-wave mix-ing (BFWM) based on electromagnetically induced transparency (EIT) The wavel-ength of the light is conversed from 780 nm to 795nm Based on the theoretical model under optical density (OD) 39 and 85 the e-fficiency of the conversion can reach around 75% and 90% respectively We con-duct two kinds of experiments one is that we change the Rabi frequency of the driving light and the other is we change the two phpton detuning However bothof the efficiency we observed are lower than that of predicted by the model Plu-s the results do not behave like the thereotical curves We surmise that this is d-ue to the compensation between two photon detuning and phase mismatch Finall-y if we want to achieve efficiency 90% there are still some issues need to be considered

Date of Award	2019
Original language	English
Supervisor	Yong-Fan Chen (Supervisor)