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Opt Lett. 2006 Apr 15;31(8):1130-2.

Joint spectrum of photon pairs measured by coincidence Fourier spectroscopy.

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  • 1Instiute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 ToruĊ„, Poland.


We propose and demonstrate a method for measuring the joint spectrum of photon pairs via Fourier spectroscopy. The biphoton spectral intensity is computed from a two-dimensional interferogram of coincidence counts. The method has been implemented for a type-I downconversion source using a pair of common-path Mach-Zehnder interferometers based on Soleil compensators. The experimental results agree well with calculated frequency correlations that take into account the effects of coupling into single-mode fibers. The Fourier method is advantageous over scanning spectrometry when detectors exhibit high dark count rates leading to dominant additive noise.

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