Abstract
There has been much recent interest in the measurement of coherence lengths of photon wavepackets particularly in relation to the correlated two-photon pairs produced in the process of parametric down conversion [1,2]. The coherence length of photons has also been regarded as an important parameter in interpretation of experiments involving cascade photons [3] carried out to test Bell’s inequality [4] and the limitations of hidden-variables theories. Conventionally, coherence length is measured by observing the dependence of fringe visibility on path length difference in a beam splitting interferometer but the advent of the study of two-photon pairs has given rise to other interesting ways of carrying out such measurements [1,2]. Here a new method of determining the coherence length, coherence time and bandwidth of the two photons produced in the two-photon decay of metastable atomic deuterium is described. This new method makes use of the subtle interplay between the entangled polarization properties and the spectral properties of the two-photon radiation.
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Duncan, A.J., Sheikh, Z.A. (1995). Polarization Correlation and Coherence Lengths of Two-Photon Radiation. In: Kleinpoppen, H., Newell, W.R. (eds) Polarized Electron/Polarized Photon Physics. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1418-7_14
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DOI: https://doi.org/10.1007/978-1-4899-1418-7_14
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