Biphoton spectroscopy in a strongly nondegenerate regime of SPDC

The absorption spectrum of Cr3+ ions in Al2O3 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 LiIO3 crystal. The spectrum of the sam...

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Bibliographic Details
Published in:Laser physics letters 2008-08, Vol.5 (8), p.600-602
Main Authors: Kalachev, A.A., Kalashnikov, D.A., Kalinkin, A.A., Mitrofanova, T.G., Shkalikov, A.V., Samartsev, V.V.
Format: Article
Language:English
Subjects:
biphoton
ruby
spectroscopy
spontaneous parametric down-conversion
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Summary:The absorption spectrum of Cr3+ ions in Al2O3 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 LiIO3 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. (© 2008 by Astro Ltd., Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)
ISSN:1612-2011
1612-202X
DOI:10.1002/lapl.200810044