Abstract

We present characterization of the hyperfine interaction for the ground ${(}^{3}{H}_{4})$ and one optically excited state ${(}^{1}{D}_{2})$ of praseodymium impurities in a yttrium orthosilicate crystal. The Zeeman and pseudoquadrupole tensors were inferred by measuring the hyperfine splittings while rotating the direction of a weak $(\ensuremath{\sim}40 \mathrm{G})$ magnetic field. The hyperfine spectra were recorded using Raman-heterodyne spectroscopy, a rf-optical double resonance technique.

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