Sr<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>F (S-FAP) has been investigated as a new Yb-doped laser crystal belonging to the apatite structural family. The spectroscopy of the Yb<sup>3+</sup> ion and the laser properties of the medium have been investigated. The maximum absorption cross section of Yb in S-FAP is 8.6 × 10<sup>-20</sup> cm<sup>2</sup>, and the maximum emission cross section is 7.3 × 10<sup>-20</sup> cm<sup>2</sup>. The measured emission lifetime of Yb<sup>3+</sup> is 1.26 ms. An Yb:S-FAP laser has been demonstrated with a Ti:sapphire laser pump operating at 899 nm. The Yb:S-FAP laser was measured to have slope efficiencies as high as 71%. The spectroscopy and laser studies are reported, as well as certain thermal, mechanical, and optical properties.
© 1994 Optical Society of America
Laura D. DeLoach, Stephen A. Payne, Larry K. Smith, Wayne L. Kway, and William F. Krupke, "Laser and spectroscopic properties of Sr5[PO4]3F:Yb," J. Opt. Soc. Am. B 11, 269-276 (1994)