Cr,Ca∶Y_3Al_5O_(12)晶体中四配位四价铬离子激光中心的形成  

Four-coordinated Cr^(4+) Laser Center in Cr, Ca: Y_3Al_5O_(12) Crystal

作　　者：陈伟[1] 徐军[1] 钟鹤裕[1] 陈杏达[1] 乔景文[1] 邓佩珍[1] 干福熹[1] 

机构地区：[1]中国科学院上海光机所,上海201800

出　　处：《中国激光》1999年第11期1036-1040,共5页Chinese Journal of Lasers

基　　金：国家博士后基金;中国科学院基金

摘　　要：在以中频感应提拉法生长Cr，Ca∶Y3Al5O12晶体的基础上，根据不同Ca／Cr掺杂浓度比的晶体于空气中退火前后的吸收光谱数据，建立了四配位四价Cr激光中心形成的缺陷反应方程，认为Cr3+到Cr4+的价态转变与晶体中带有两个而不是一个正电荷的氧离子空位有关。In the light of annealing data about Cr,Ca:Y3Al5O12 crystals with various Ca/Cr content ratios, we established a set of solid-state defect reaction formulas describing the formation of the four-coordinated quadra-valence Cr4+ laser center in the crystal. The valence state of the Cr4+ laser center depends mainly on the divalent Ca2+ compensation ion in the crystal, which can introduce an oxygen vacancy into the crystal. The concentration of the Cr4+ laser center has also been estimated and indicated that its absorption cross-section at 1064 nm wavelength is most probably 5.7 ×10-18 cm2.

关 键 词：CR Ca:Y3Al5O12 四配位 四价 晶体生长 

分 类 号：O781[理学—晶体学] O614.231