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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical spectroscopy using biphotons

Alexei A. Kalachev, Alexander A. Kalinkin, Самарцев Виталий Владимирович, A. V. Shkalikov

Published Mar 3, 2006• 0 citations
Publisher

Abstract

The possibilities of spectroscopic investigations by means of correlated photon pairs (biphotons) generated in spontaneous parametric down-conversion are analyzed. It is shown that modulation of the single-photon wave packets allows one to determine the form of absorption line even if spectral width of that is much less than spectral resolution of monochromator.

DOI
10.1117/12.675012

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The possibilities of spectroscopic investigations by means of correlated photon pairs (biphotons) generated in spontaneous parametric down-conversion are analyzed. It is shown that modulation of the single-photon wave packets allows one to determine the form of absorption line even if spectral width of that is much less than spectral resolution of monochromator.
The generation of biphoton wave packets with a broad spectrum owing to quasi-phase-matched spontaneous parametric down-conversion in a crystal with an aperiodic poling has been considered. Biphotons at the exit of such a sample are not Fourier limited; i.e., their correlation time is much larger than the inverse width of the spectrum. It has been shown that if the inverse grating vector varies linearly along the sample length, the generated biphoton wave packets can be compressed in time by transmitting two-photon light through an optical fiber.
The problem of generating a narrow-band biphoton field during spontaneous parametric down conversion of light in a quadratic nonlinear medium in a cavity is discussed. It is shown that, in the case of double resonance (for signal and idle fields), the form of the single-photon wave packet is biexponential and has a half-width determined by the photon life time in the cavity. An experiment is carried out on the generation of narrow-band biphotons in a crystal of lithium iodine with I-type matching in a frequency degenerate collinear regime. The second-order correlation function of the cavity-enhanced biphotons is measured using the electric nanosecond time delay line.
The absorption spectrum of Cr 3+ ions in Al 2 O 3 crystal in the range from 691 nm to 697 nm was measured at the room temperature using the biphoton light generated by nondegenerate spontaneous parametric down-conversion of the He-Cd laser radiation (325 nm) in the LiIO 3 crystal. The spectrum of the sample was measured by counting the coincidences when signal photons go through the impurity crystal, whilst the wavelength of the idler photons is resolved by a monochromator. A strongly nondegenerate regime of SPDC, when the difference in frequencies of correlated photons exceeds significantly their spectral width, was used in the biphoton spectroscopy for the first time. Such a regime allows one to obtain an absorption spectrum by measuring the wavelength in a completely different spectral range.