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By A. van der Neut

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At room temperature, the lifetimes of Mns+ centers are 1-2 order of magnitude longer than the lifetimes of Cr'+doped compounds. Usually they vary from several tens to several hundreds of microseconds [46], which is favorable for high power laser operation. In contrast to Cr'+-doped materials demonstrating four-level schemes of laser action, for Mns+-systems, a three-level scheme with a rather high threshold and low efficiency is typical. =1181 nm was reported for the first time in Mn:Ba3(VO,h pumped by a dye-laser at room temperature [77].

So····1······s. 0·····t·····460····· ····21·i·s···t····O:82····I·····8~i······1·····4·60····· ······ji···· L~;B~;O·;····· ····j·ss·s···l····o·. ·23····1····o·. 450 .. -o4····1·····340····· ····:::j·O···· KCaF3 ............................................................ :. ,; ................................. , ................ ;. ,: ................................................. .......................... -~ ..... -.... -..... - .. u·····-····f···· ............ ············· .. ··i················~·················~·· ..

The laser quality of the Ti:A120a crystals is characterized by a so called figure of merit (FOM) determined by the ratio of the peak absorption at 490 nm to the parasitic absorption at 800 nm (the peak wavelength of emission of Te+ ion). Material with FOM>I00 (for x-polarized light) is commercially available [16]. Further laser action of Ti3+ ions was obtained in other hosts (in particular, in BeAI20, [17] and YAIOa [18]), but Ti 3+:AI 20 3 remains the best titanum laser. The reasons for this are both the unique thermomechanical properties of the Al 20 a host and the spectroscopic advAntages of the Ti3+:AI 20 3 system.

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