Stable Scanning of Dressing Fields on Multiwave Mixing in Optical Ring Cavity

We investigate a novel detection technique to study the coherent control of dressed multiwave mixing (MWM) process. A stable laser dressing field with a wavelength of 480 nm is realized via the second harmonic generation technique. By scanning such dressing field, stable Rydberg MWM signals with high signal-to-noise ratio are observed. With the MWM signals oscillated in a stabilized three-mirror cavity and cavity dressing field scanned, dressed MWM cavity modes are obtained. Thanks to the stable 480 nm and cavity dressing fields, the long-term drift of dressed MWM in cavity can be dramatically reduced to <;4 MHz from 100 MHz.