Abstract
A stimulated photon echo modulation varying in T (separation between the second and third pulses) due to the superhyperfine interaction between a Cr ion and neighboring Al nuclei has been observed in ruby by using a Stark switching technique. The modulation was observed for a time much longer than T2, and much higher resolution was obtained than by two-pulse photon echo experiments. An apparent disagreement between theoretical and experimental modulation patterns was noticed in the region where T>T2.
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