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一、引言五磷酸钕晶体(分子式NdP_5O_(14),简写Ndpp)是一种光学增益高的激光材料。Nd~(3+)不是作为掺质进入基质,而是按一定化学计量比的化合物中的组份,即Nd~(3+)既是激活离子又是基质。Ndpp晶体中Nd~(3+)浓度(4×10~(21)厘米~(-3))约为掺钕1%的钇铝榴石(Nd:YAG)中Nd~(3+)浓度的30倍。尽管Ndpp中Nd~(3+)浓度很高,但由于Nd~(3+)之间被—O—P—O—基团隔离,减弱了Nd~(3+)与Nd~(3+)之间的偶极作用,从而降低了荧光猝灭。同时,Ndpp晶体的发射截面和线宽同Nd—YAG相似,而光学增益比Nd:YAG约高30倍。这样可以用较小样品在很小体积内获得较高的光激
I. Introduction Neodymium pentaphosphate crystal (molecular formula NdP_5O_ (14), abbreviation Ndpp) is a high optical gain laser material. Nd 3+ does not enter the matrix as a dopant, but rather is a component of the compound in a stoichiometric ratio, ie Nd 3+ is both an activated ion and a host. The concentration of Nd ~ (3 +) in Ndpp crystals (4 × 10 ~ (21) cm ~ (-3)) is about Nd ~ (3+) concentration in yttrium aluminum garnet (Nd: YAG) 30 times. Although the concentration of Nd ~ (3+) in Ndpp is high, Nd ~ (3+) and Nd ~ (3+) are weakened by the separation of Nd ~ (3+) Dipolar interaction between the two, thus reducing the fluorescence quenching. At the same time, Ndpp crystal has similar emission cross-section and linewidth to Nd-YAG with about 30 times higher optical gain than Nd: YAG. This makes it possible to obtain higher light stimulations in smaller volumes with smaller samples