The laser-induced fluorescence of thermographic phosphors provides a technique for making remote, non-contact temperature measurements of either static or moving surfaces. Single crystals of such phosphors may hold promise for the realization of a new scale of temperatures defined in terms of atomic transitions. With this goal in mind, we have taken data describing the fluorescence lifetime and amplitude of LaPO4 single crystals from room temperature through 650 C. These results are compared against similar data from a powder of the same material. The measurement system and its associated systematic errors are discussed.

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