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Optics Letters

Phase-modulation technique for accumulated photon echo

S. Saikan, Kiyoshi Uchikawa, H. Ohsawa

Published Jan 1, 1991• 26 citations
Publisher

Abstract

A novel photon-echo technique based on the phase-modulation method has been developed that is applicable to the accumulated photon echo in scattering materials.
DOI
10.1364/ol.16.000010

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This talk presents a review of our recent experimental results on femtosecond accumulated photon echo in dye-doped polymers. The aim of this research is to clarify the parameter that is most important in affecting seriously the linear electron-phonon coupling in these samples, and to find the materials which have extremely weak linear electron-phonon coupling. The latter research is needed for the improvement of the PHB memory materials. We have so far demonstrated experimentally that Fourier-transform spectroscopy [1] based on the femtosecond accumulated photon echo is most useful for these studies. Furthermore, the detection sensitivity for the accumulated photon echoes has been improved significantly with the use of the phase modulation technique [2].

Spectral Hole-Burning and Related Spectroscopies: Science and Applications•Jan 1, 1991•0 citations
Generally, the photon echo measurement in opaque and scattering materials is difficult since the scattered pump beam overloads the detector. In this sense, a different modulation technique which does not induce the intensity modulation of the pump beam, is desirable for the scattering materials. We previously reported [1] that phase modulation method is also applicable to the measurement of accumulated photon echo. This technique has been much improved, and we have succeeded the fluorescence detection of the femtosecond accumulated photon echo.
A new method for waveform measurement of photon echoes using a modified Michelson interferometer has been developed. The experimental setup uses collinear geometry, and photon echo signals are detected using a double-phase modulation technique. The amplitude and phase of photon echoes and those of excitation pulses are simultaneously measured by this technique. The method has been applied to a photon echo experiment on a dye solution. The results are explained using a stochastic modulation model with an accumulation effect of population grating.
This talk presents a review of our recent experimental results on femtosecond accumulated photon echo in dye-doped polymers. The aim of this research is to clarify the parameter that is most important in affecting seriously the linear electron-phonon coupling in these samples, and to find the materials which have extremely weak linear electron-phonon coupling. The latter research is needed for the improvement of the PHB memory materials. We have so far demonstrated experimentally that Fourier-transform spectroscopy [1] based on the femtosecond accumulated photon echo is most useful for these studies. Furthermore, the detection sensitivity for the accumulated photon echoes has been improved significantly with the use of the phase modulation technique [2].