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Laser Chemistry

Incoherent Mid‐Infrared PhotonEchoes With ParametricallyDownconverted Light

Sander Woutersen, Mischa Bonn, Uli Emmerichs, Huib J. Bakker

Published Jan 1, 1999• 0 citations
Publisher

Abstract

We present a simple method to generate mid‐infrared photon echoes, using parametrically downconverted incoherent light. The photon echoes generated in this way enable the study of the dynamics of vibrations in the 1.5–4.0 μm wavelength region with subpicosecond time resolution.
DOI
10.1155/1999/76906

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We demonstrate nondegenerate photon pair generation by spontaneous parametric downconversion in a silver gallium sulfide AgGaS2 crystal. By tuning the pump wavelength, we achieve phase matching over a large spectral range. This allows to generate idler photons in the mid-infrared spectral range above a 6 μm wavelength with corresponding signal photons in the visible. Also, we show photon pair generation with broad spectral bandwidth. These results are a valuable step toward the development of quantum imaging and sensing techniques in the mid-infrared.