Competition between Two Six-Wave Mixing Channels in Atomic Rb Vapor

Gang Shi, Changjun Zhu, Bing Xue +1 more

G. Grynberg

Changjun Zhu, Na Tong, Junfang He +3 more

Two six-wave mixing processes are achieved simultaneously in rubidium vapor and two channels are identified. Signal competition between the two channels is observed and phase matching conditions are analyzed for the two channels. The results show that the two six-wave mixing channels correspond to two parametric processes with weak coupling and, moreover, quantum interference and phase matching conditions primarily govern the signal competition.

Changjun Zhu, Na Tong, Bing Xue +1 more

Two wavelength optical signals in the infrared regime were generated in atomic rubidium (Rb) vapor using a Ti:sapphire laser amplifier and competition between the two signals was observed. The effects of Rb number density, pump laser intensity and the chirp of laser pulses on the characteristics of the two signals were investigated. The results show that the two signals were mainly generated by two coupled difference frequency six wave mixings and, in the meantime, two coupled six wave mixing channels were identified. The competition between the two signals is dominantly governed by phase matching conditions in the two six wave mixing processes. The phase matching conditions in the two channels are primarily determined by the Rb number density and, whereas, the phase matching conditions are scarcely related to pump laser intensity and the chirp of pump laser pulses.

James J. Wynne, P. P. Sorokin

Chang Jun Zhu, Han Chen Liu, Xue Jun Zhai +2 more

Parametric six-wave mixing processes have been achieved in Rb and two parametric six-wave mixing channels, 5S→→5D→→6P→→S1/2→→P1/2→→5S and 5S→→5D →→P→→S1/2→→52P3/2→→5S, have been identified. Competition between the two channels is observed and, furthermore, phase matching conditions in the two channels are analyzed and calculated. The calculation results agree well with the experimental observations, indicating that the phase matching is the main factor governing the competition between the two parametric six-wave mixing channels.