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Applied Optics

Two-Photon Correlations in a Mixture of Gaussian and Laser Light

G. Present, D. B. Scarl

Published Jan 1, 1972• 23 citations
Publisher

Abstract

Measurement of the two-photon time distribution in a mixture of light from a He-Ne laser and a Gaussian source of the same central frequency agrees well with the prediction of coherence theory when the laser is represented by a single coherent state. The peak in the distribution near zero time difference is made up of contributions due to the second-order interference between pairs of Gaussian photons and between laser and Gaussian photons.

DOI
10.1364/ao.11.000120

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Bulletin of the American Physical Society•Mar 19, 2010•0 citations
Measurement of the two-photon time distribution in a mixture of light from a He-Ne laser and a Gaussian source of the same central frequency agrees well with the prediction of coherence theory when the laser is represented by a single coherent state. The peak in the distribution near zero time difference is made up of contributions due to the second-order interference between pairs of Gaussian photons and between laser and Gaussian photons.
Measurements have been made of the distribution in time of arrival of photons produced in a low-pressure Hg198{\mathrm{Hg}}^{198}Hg198 discharge. Sufficient calibration was done so that the measurements could be directly compared with the predictions of a calculation of G(2)(x1,x2,x2,x1){G}^{(2)}({x}_{1},{x}_{2},{x}_{2},{x}_{1})G(2)(x1​,x2​,x2​,x1​), the second-order coherence function. Correlations were observed in a mixture of light from two independent sources and between orthogonally polarized components of a beam initially in a pure polarization state.
Recently some novel two-photon interference experiments have been performed, where quantities such as the field coherence time and the beat spacing between light beams with different frequencies were measured with high time resolution1. These experiments have overcome the traditional limits on time resolution by combining a Mach-Zehnder interferometer configuration with the two-photon correlation technique. All of these experiments, however, have been performed with cw light sources, and no attempt has yet been made to measure the temporal variation of the field intensity.
Some very interesting pure non-Gaussian states in quantum optics have already been produced experimentally (with one pulsed laser): the single-photon-added coherent states, among others. Important interference phenomena by superposing beams from two independent masers or lasers have been investigated earlier experimentally and theoretically. By pursuing on both subjects altogether, we propose a possible new experiment to generate single-photon-added coherent states, by employing two independent laser sources, both in continuous regime and having approximately equal frequencies and coherence times tc: we expect that such generations could occur during times of the order of tc/3 (possibly, a bit shorter). This expectation follows from a fully quantized multimode analysis of the temporal mode structure, which extends previous studies of parametric down conversion and balanced homodyne detection