Abstract
We demonstrate a scheme for frequency correlated biphoton spectroscopy using a strongly non-degenerate downconversion source and a tunable upconversion detector. In this scheme, the spectral function at one wavelength range of a remote object can be reproduced by locally measuring another wavelength range using an upconversion detector and monitoring the coincidence counts. The spectral resolution of the system is better than 0.1 nm, corresponding to the acceptance width of the upconversion detector, while the measurement range is determined by the linewidth of the source.
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