Editing Lithium (section)

=== Optics ===
[[Lithium fluoride]], artificially grown as [[crystal]], is clear and transparent and often used in specialist optics for [[infrared|IR]], [[ultraviolet|UV]] and VUV ([[vacuum UV]]) applications. It has one of the lowest [[refractive index|refractive indices]] and the furthest transmission range in the deep UV of most common materials.<ref>{{Cite book |url={{google books |plainurl=y |id=CQ5uKN_MN2gC |page=149}} |page=149 |title=Building Electro-Optical Systems: Making It All Work |author=Hobbs, Philip C. D. |publisher=John Wiley and Sons |date=2009 |isbn=978-0-470-40229-0 |url-status=live |archive-url=https://web.archive.org/web/20160623202135/https://books.google.com/books?id=CQ5uKN_MN2gC&pg=PA149 |archive-date=23 June 2016}}</ref> Finely divided lithium fluoride powder has been used for [[Thermoluminescent Dosimeter|thermoluminescent radiation dosimetry]] (TLD): when a sample of such is exposed to radiation, it accumulates [[crystal defect]]s which, when heated, resolve via a release of bluish light whose intensity is proportional to the [[absorbed dose]], thus allowing this to be quantified.<ref>{{Cite book |publisher=World Scientific |url={{google books |plainurl=y |id=FY7s7pPSPtgC |page=819}} |title=Point Defects in Lithium Fluoride Films Induced by Gamma Irradiation |page=819 |series=Proceedings of the 7th International Conference on Advanced Technology & Particle Physics: (ICATPP-7): Villa Olmo, Como, Italy |date=2002 |volume=2001 |isbn=978-981-238-180-4 |url-status=live |archive-url=https://web.archive.org/web/20160606154252/https://books.google.com/books?id=FY7s7pPSPtgC&pg=PA819 |archive-date=6 June 2016}}</ref> Lithium fluoride is sometimes used in focal lenses of [[telescope]]s.<ref name="CRC" /><ref>{{Cite journal |last1=Sinton |first1=William M. |title=Infrared Spectroscopy of Planets and Stars |journal=Applied Optics |volume=1 |page=105 |date=1962 |doi=10.1364/AO.1.000105 |bibcode=1962ApOpt...1..105S |issue=2}}</ref>

The high non-linearity of [[lithium niobate]] also makes it useful in [[nonlinear optics|non-linear optics applications]]. It is used extensively in telecommunication products such as mobile phones and [[optical modulator]]s, for such components as [[crystal oscillator|resonant crystals]]. Lithium applications are used in more than 60% of mobile phones.<ref>{{cite web |url=http://nl.computers.toshiba-europe.com/Contents/Toshiba_nl/NL/WHITEPAPER/files/TISBWhitepapertech.pdf |title=You've got the power: the evolution of batteries and the future of fuel cells |publisher=Toshiba |access-date=17 May 2009 |url-status=live |archive-url=https://web.archive.org/web/20110717075300/http://nl.computers.toshiba-europe.com/Contents/Toshiba_nl/NL/WHITEPAPER/files/TISBWhitepapertech.pdf |archive-date=17 July 2011}}</ref>