Abstract
Following the experiments of Shverdin and colleagues [Phys. Rev. Lett. 94, 033904 (2005)] , we describe a technique for determining the temporal envelope of an optical beam whose spectrum consists of n discrete, equally spaced frequency components. Four-wave mixing is employed to generate higher-frequency sidebands. The relative intensities of these sidebands, together with the intensities of the incident sidebands, determine the unknown relative phases of the incident beam.
© 2005 Optical Society of America
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