Demonstration of accumulated photon echoes by using synchrotron radiation

Synchrotron radiation (SR) can be applied as an excitation source of the accumulated photon echoes. The accumulated photon echoes of sulforhodamine 640 ( SRh 640) doped in polyvinyl alcohol film (PVA) was successfully observed by exciting the sample with the SR and employing the phase modulation method. When we used SR passed through a bandpass filter with bandwidth of about 13 nm, the photon echo decay curve was obtained with a time resolution of 133 fs. In addition, when the bandpass filter was removed, the field autocorrelation time of the SR beam decreased to about 3 fs.<
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