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Several properties of Eu:Y2SiO5 spectral holes are measured, to assess thesuitability of broad-band hole-patterns for use as laser-frequency references.We measure frequency shifts due to magnetic fields, side-features ofneighboring spectral holes, and changing optical probe power. A precisecalibration of a temperature insensitive point is also performed, where thetemperature-induced frequency shift is canceled to first order by thepressure-induced shift from the crystal's helium-gas environment.

Shifts of optical frequency references based on spectral-hole burning in Eu:Y2SiO5