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Classical Realization of Dispersion Cancellation by Using Transform-limited Pulses

Kazuhisa Ogawa, Shuhei Tamate, Toshihiro Nakanishi, H. Kobayashi, Masao Kitano

Published Jan 1, 2014• 0 citations
Publisher

Abstract

We report classical optical interferometry reproducing dispersion-insensitive Hong-Ou-Mandel interferograms. Our scheme is based on the time-reversal symmetry of quan-tum dynamics. We achieved high-visibility Hong-Ou-Mandel interferograms owing to simplicity of our setup.
DOI
10.1364/cleo_qels.2014.fw1a.3

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We propose a classical optical interferometry scheme that reproduces dispersion-insensitive Hong-Ou-Mandel interferograms. The interferometric scheme is derived from a systematic method based on the time-reversal symmetry of quantum mechanics. The scheme uses a time-reversed version of a Hong-Ou-Mandel interferometer with pairs of orthogonally polarized input laser pulses. We experimentally demonstrate automatic dispersion cancellation using the interferometry. The results show that the interferometer can obtain high-visibility interferograms with high signal conversion efficiency.
Here we report on a completely classical technique based on the time-reversal symmetry of quantum mechanics that achieves all the advantages of HOM interferometry by using oppositely-chirped laser pulses. Since our technique relies on classical lasers instead of entangled photons, it achieves these features with millions of times larger signal making it an attractive candidate for dispersion-free OCT. In particular, the visibility and width of the CPI interferogram is insensitive to dispersion and photon loss, and inherently robust against phase-fluctuations. Further, we achieve higher resolution than classical interferometers using the same bandwidth. On a fundamental level, our work emphasizes the importance of delineating truly quantum effects from those with classical analogues, and shows how insights gained from quantum mechanics can inspire novel classical technologies.
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Chirped-pulse interferometry is a new interferometric technique encapsulating the advantages of the quantum Hong-Ou-Mandel interferometer without the drawbacks of using entangled photons. Both interferometers can exhibit even-order dispersion cancellation which allows high resolution optical delay measurements even in thick optical samples. In the present work, we show that finite frequency correlations in chirped-pulse interferometry and Hong-Ou-Mandel interferometry limit the degree of dispersion cancellation. Our results are important considerations in designing practical devices based on these technologies.
In this paper, we revisit the well-known Hong–Ou–Mandel (HOM) effect in which two photons, which meet at a beamsplitter, can interfere destructively, leading to null in coincidence counts. In a standard HOM measurement, the coincidence counts across the two output ports of the beamsplitter are monitored as the temporal delay between the two photons prior to the beamsplitter is varied, resulting in the well-known HOM dip. We show, both theoretically and experimentally, that by leaving the delay fixed at a particular value while relying on spectrally resolved coincidence photon counting, we can reconstruct the HOM dip, which would have been obtained through a standard delay-scanning, non-spectrally resolved HOM measurement. We show that our numerical reconstruction procedure exhibits a novel dispersion cancellation effect, to all orders. We discuss how our present work can lead to a drastic reduction in the time required to acquire a HOM interferogram, and specifically discuss how this could be of particular importance for the implementation of efficient quantum-optical coherence tomography devices.