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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Generation of two wavelength-infrared optical signals based on coupled parametric six-wave mixings

Changjun Zhu, Na Tong, Bing Xue, Xuejun Zhai

Published Feb 19, 2015• 0 citations
Publisher

Abstract

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.

DOI
10.1117/12.2075820

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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.
Optical signals of two different wavelengths in the IR regime were generated in atomic Rb vapor using broad bandwidth laser pulses. Competition between the two signals was observed. The effects of pump laser intensity,chirp of laser pulses and Rb number density on the characteristics of the two signals were investigated. The results showthat the two signals were generated from two coupled parametric six-wave mixings processes and the competition between the two signals was dominantly governed by phase matching conditions related to Rb number density.
Generation and control of optical signals in a wide wavelength range is of significant importance in optical gates and coherent control.Optical signals of two different wavelengths in the IR regime were generated in atomic Rb vapor using broad bandwidth laser pulses,and competition between the two signals was observed.The effects of pump laser intensity,chirp of laser pulses and Rb number density on the characteristics of the two signals were investigated.The results show that the two signals were generated from two coupled parametric sixwave mixing processes,and the signals vary with pump laser intensity,chirp of pump laser pulses and Rb number density.Moreover,the competition between the two signals was dominantly governed by phase matching conditions closely related to Rb number density.
Two processes of coupled difference-frequency axially phase-matched parametric six-wave mixing are carried out in Rb vapour by two-photon excitation using fs laser pulses, and parametric six-wave mixing signals in the infrared and near infrared regime are detected. The infrared parametric six-wave mixing signals are up-converted into the visible spectral range by sum-frequency mixing with the pump laser in a LHO 3 crystal. Moreover, quantum beating at 608 cm -1 , corresponding to the 7 s – 5d energy difference in Rb, is observed from the sum-frequency signal at 495 nm. As a result, we obtain modulated light signals in the visible, near infrared and infrared spectral ranges, and study the interference between 7s and 5d states of Rb.
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.
Axially phase-matched parametric six-wave mixing was achieved in Rb and the parametric six-wave mixing signals in the infrared range were detected.Tunable signals in the visible range were produced by sum-frequency mixing of the pump laser and the parametric six-wave mixing signals in the infrared range.And,quantum beating at a frequency of 608 cm-1 was observed from the sum-frequency signal,indicating that the coherent properties of atoms and molecules can be studied by means of quantum beating recovered from parametric six-wave mixing signals.