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A thulium-doped crystal is experimentally shown to be an excellent candidatefor broadband quantum storage in a solid-state medium. For the first time,nuclear spin coherence is optically excited, detected and characterized in sucha crystal. The lifetime of the spin coherence -- the potential storage entity-- is measured by means of Raman echo to be about 300 $\mu$s over a wide rangeof ground state splittings. This flexibility, attractive for broadbandoperation, and well fitted to existing quantum sources, results from the simplehyperfine structure, contrasting with Pr- and Eu- doped crystals.

Optical Excitation of Nuclear Spin Coherence in Tm3+:YAG