title: Photon-gated spectral hole burning in Pr(3+):YAG.
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.
authors.forename: R M
authors.initials: RM
authors.lastname: Macfarlane
authors.forename: G
authors.initials: G
authors.lastname: Wittmann