Abstract
We observed photon-gated spectral hole burning in Pr:YAG and assigned the hole-burning mechanism to selective photoionization of trivalent praseodymium. Gated holes were observed in absorption lines to the two lowest components of the (1)D(2) manifold. At 1.4 K the gating ratio is in excess of 1.5 x 10(4). Strong competition from the transient mechanism of optical pumping of hyperfine levels occurs below 6 K.
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