Registration of the photon echo signals in the photon counting mode

The method of registration of weak light pulses in a mode of the photon counting is discussed. The principle of photon counting, its key points and operating circuit configuration, as well as characteristics of photomultiplier tubes and basic characteristics of the photon counting is explained. The appendix of techniques of the photon counting for experiments in the field of a photon echo is considered

Simulation of coherent responses of resonant media excited by a series of ultrashort laser pulses

A technique for the numerical simulation of coherent optical responses of the photon echo type formed in resonance media with strong inhomogeneous broadening under the action of femtosecond laser pulses is developed. This approach is based on solving the Maxwell-Bloch equations using the finite-difference time-domain (FDTD) method without application of a fast rotating field and slowly varying envelope approximations. The method can be used to simulate coherent responses in different resonance media with a complex structure of energy levels. The technique was validated using the example of describing experiments on narrowing a photon echo pulse and femtosecond echo processing. © Allerton Press, Inc., 2012

Optical echo-spectroscopy of highly doped Tm:YAG

Two-pulse, stimulated and accumulated photon echoes are investigated for the first time in a highly doped crystal Tm: YAG containing 10 at.% Tm3+. The decay curves of the two-pulse and stimulated photon echoes generated at 793.15 nm on the transition 3H6 (1)-3H4 (1) of the impurity ions are measured in the absence of an applied magnetic field and parameters describing the energy and phase relaxation are determined. The dependence of the intensity of the accumulated photon echo on the number of excitation pulse pairs is investigated. © 2008 by Astro Ltd

Formation of photonic echo signals in the presents of a strong concentration quenching effect

The connection between the photonic echo formation in crystals doped by rare-earth elements and the concentration effects was studied. The application of optical echo spectroscopy in studies of garnet crystals with a high content of thulium impurity was demonstrated. By the example of activated crystals of ruby and lanthanum trifluoride, the spectral transformation of the photonic echo signals was analyzed in the present of the concentration quenching effect. © 2009 Allerton Press, Inc

Photon echo in the ensemble of semiconductor quantum dots spread on a glass substrate

Simple procedure to prepare samples containing semiconductor quantum dots was developed. Test photon echo measurements in the ensemble of quantum dots spread on a glass substrate were performed to study optical dephasing processes

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

Multichannel information processing in the optical echo-processors on the basis of Van-Fleck paramagnet crystals

The analysis of various modes of multichannel information recording and readout in conditions of a stimulated (accumulated and long-living) photon echo in the crystals doped with rare earth ions which are known as Van-Fleck paramagnets has been performed in order to utilize them in the operation of low-temperature optical echo-processors. © Allerton Press, Inc., 2012

Registration of the photon echo signals in the photon counting mode

The method of registration of weak light pulses in a mode of the photon counting is discussed. The principle of photon counting, its key points and operating circuit configuration, as well as characteristics of photomultiplier tubes and basic characteristics of the photon counting is explained. The appendix of techniques of the photon counting for experiments in the field of a photon echo is considered

Registration of the photon echo signals in the photon counting mode

The method of registration of weak light pulses in a mode of the photon counting is discussed. The principle of photon counting, its key points and operating circuit configuration, as well as characteristics of photomultiplier tubes and basic characteristics of the photon counting is explained. The appendix of techniques of the photon counting for experiments in the field of a photon echo is considered