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Chinese Physics Letters

Three-Photon Resonant Six-Wave Mixing with Phase-Conjugation Geometry in Na Atomic Vapour

左战春, 孙江, 米辛, 俞祖和, 姜谦, 吴令安, 傅盘铭

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

We report a three-photon resonant six-wave mixing (SWM) with phase- conjugation geometry. It has advantages that phase matching condition is not critical and the generation of SWM signal is efficient. This technique provides a new spectroscopic tool for studying the highly excited atomic or molecular states with high resolution. The feasibility of this technique is demonstrated in sodium vapour.

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We report a three-photon resonant six-wave mixing (SWM) with phase- conjugation geometry. It has advantages that phase matching condition is not critical and the generation of SWM signal is efficient. This technique provides a new spectroscopic tool for studying the highly excited atomic or molecular states with high resolution. The feasibility of this technique is demonstrated in sodium vapour.
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A generalized scheme for phase-conjugate resonant 2n-wave mixing, which has a high efficiency and is easy for phase matching, is proposed. As a new type of coherent laser spectroscopy this approach can be employed for studying highly excited atomic states or states with a high angular momentum. To demonstrate its feasibility we have studied the doubly excited autoionizing Rydberg states of Ba by phase-conjugate six-wave mixing, and have furthermore achieved eight-wave mixing in Na. This method may find wide application in related areas such as coherent transient spectroscopy, Autler-Townes spectroscopy and electromagnetically induced transparency. In particular, it may provide new insights into the nature of highly excited states.
In this paper, we theoretically and experimentally demonstrate a novel nondestructive optical detection method by coherently exciting and controlling the electromagnetically induced transparency (EIT)-assisted six-wave mixing (SWM) process of S state Rydberg atoms in 85Rb vapour. By analysing the evolution regularity of the resonant SWM signals under various conditions, one can control the signal by altering the atom density and detuning and the strengths of the probe and coupling fields. The characteristics of this SWM process provide a potential application for spectroscopy physics and determining the interactions between optical fields and atoms.