Optical spectroscopy using biphotons

The possibility of performing spectroscopic study using correlated photon pairs (biphotons) generated in spontaneous parametric down conversion was analyzed. It was shown that the use of modulated single-photon wave packets makes it possible to measure the shape of an absorption line even when its width is much smaller than the monochromator resolution. © 2007 by Allerton Press, Inc

Optical spectroscopy using biphotons

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

Generation of narrow-band correlated photon pairs by spontaneous down conversion in a cavity

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. © 2009 Allerton Press, Inc

Incoherently generated photon echo in a crystal of ruby using fiber optical delay line

This paper is about the possibilities of optically dense impurity media spectroscopy by means of the incoherent photon echo. The theoretical model of the phenomenon is given. The results of experiment on incoherent photon echo in a crystal of ruby at liquid helium temperature are presented. Fiber optical delay line was used to make an incoherence of the excitation radiation. The dependence of the incoherent echo intensity on the excitation wavelength was studied. The echo decay curve was obtained and the phase relaxation time was found to be equal to 98 ns

Incoherent photon echo in spectroscopy of optically dense impurity media

The possibility of using incoherent photon echo in spectroscopy of optically dense impurity media is considered. A theoretical approach to description of this phenomenon is presented. The experimental data on incoherent photon echo in ruby at liquid-helium temperature, with transport of an excitation pulse through a fiber, are reported. The spectral dependence of the echo intensity is studied. The decay curve for an incoherent echo signal is investigated, and the phase relaxation time is found to be 98 ns. © Allerton Press, Inc. 2008

Broad-band sources of single-photon pulses, based on spontaneous parametric scattering in nonlinear impurity crystals

This paper discusses the possibilities of using spontaneous parametric scattering (SPS) in impurity crystals with a periodic domain structure for the efficient generation of narrow-band single-photon pulses. Using a periodically poled potassium titanyl phosphate crystal doped with trivalent erbium ions as an example, it is shown that, in the case of a nonlinear crystal with a periodic domain structure, allowing the generation of photons on the opposite sides, the width of the SPS spectrum can be less than the free spectral zone of a single-cavity parametric generator based on this crystal. Such an SPS regime can be useful when creating narrow-band sources of single-photon states that can be recorded and reproduced in optical quantum-memory devices, as well as for combining SPS processes and quantum memory in a single medium-a nonlinear impurity crystal. © 2014 Optical Society of America