Frequency conversion through Rydberg states

We demonstrate progress towards frequency conversion using four-wave mixing through Rydberg states in rubidium vapor. Excitation is accomplished through the intermediate 6p state using light at 420 nm generated through parametric four-wave mixing in combination with a 1015 nm laser. We demonstrate Electromagnetically Induced Transparency as a result of the Rydberg excitation transition. The application of microwaves then allows transitions between neighboring Rydberg states. This system is promising for potential six-wave mixing to accomplish microwave to optical frequency conversion