Yttrium lithium fluoride
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| 3D model (JSmol) | |
| PubChem CID | |
| CompTox Dashboard (EPA) | |
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| Properties | |
| F4LiY | |
| Molar mass | 171.84 g·mol−1 | 
| Related compounds | |
| Other cations | Lithium holmium fluoride | 
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
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. 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.