Yttrium lithium fluoride (LiYF4, sometimes abbreviated YLF) is a birefringent crystal, typically doped with neodymium or praseodymium and used as a gain medium in solid-state lasers.[1] Yttrium is the substitutional element in LiYF4. The hardness of YLF is significantly lower than other commons crystalline laser media, i.e. yttrium aluminium garnet.[2]


  1. ^ Ignat’ev, A. I.; Nikonorov, N. V.; Mochalov, I. V.; Tsygankova, E. V.; Reĭterov, V. M. (2007-11-01). "Features of the etching of an yttrium–lithium fluoride crystal in HNO3 solutions". Journal of Optical Technology. 74 (11): 776–778. doi:10.1364/JOT.74.000776.
  2. ^ Chicklis, E.P.; Folweiler, R.C.; Naitnan, C.S. "0.85 MICRON SOLID STATE LASER: MATERIAL EVALUATION" (PDF). Archived (PDF) from the original on May 10, 2022. Retrieved 10 May 2022.

See also