We present a demonstration of mid-infrared photon echoes generated with parametrically downconverted incoherent light. The photon echoes generated in this way enable one to study the dynamics of vibrations in the 1.5-4.0 -μm wavelength region with subpicosecond time resolution.

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Journal Opt. Lett.
Citation
Woutersen, S, Bonn, M, Brugmans, M.J.P, Emmerichs, U, & Bakker, H.J. (1996). Generation of incoherent mid-infrared photon echoes with parametrically downconverted light. Opt. Lett., 21, 1579–1581.