Site-selective excitation and polarized absorption spectra of Nd3+ in Sr-5(PO4)(3)F and Ca-5(PO4)(3)F

被引:33
作者
Gruber, JB
Morrison, CA
Seltzer, MD
Wright, AO
Nadler, MP
Allik, TH
Hutchinson, JA
Chai, BHT
机构
[1] USA,RES LAB,ADELPHI,MD 20783
[2] USN,AIR WARFARE CTR,WEAPONS DIV,CHINA LAKE,CA 93555
[3] SCI APPLICAT INT CORP,MCLEAN,VA 22102
[4] USA,NIGHT VIS & ELECTR SENSORS DIRECTORATE,FT BELVOIR,VA 22060
[5] UNIV CENT FLORIDA,CTR RES ELECTROOPT & LASERS,ORLANDO,FL 32836
关键词
D O I
10.1063/1.360964
中图分类号
O59 [应用物理学];
学科分类号
摘要
Polarized absorption and fluorescence spectra were analyzed to establish individual energy (Stark) levels of Nd3+ ions in host crystals of Sr-5(PO4)(3)F (SFAP) and Ca-5(PO4)(3)F (FAP). Site-selective excitation and fluorescence facilitated differentiation between Nd3+ ions in emitting sites-associated with 1.06 mu m stimulated emission, and nonemitting Nd3+ ions in other sites. Measurements were made on samples containing different concentrations of Nd3+ at 4 K and higher temperatures. Substitution of Nd3+ for Sr2+ or Ca2+ was accompanied by passive charge compensation during crystal growth. Crystal-field splitting calculations were performed according to site for Stark levels of Nd3+ ions identified spectroscopically. We obtained a final set of crystal-field parameters B-nm for Nd3+ ions in fluorescing sites with a rms, deviation of 7 cm(-1) (52 levels in Nd:SFAP) and 8 cm(-1) (59 levels in Nd:FAP). For one of the nonemitting sites in Nd:FAP we obtained a final set of B-nm parameters which gave a rms deviation of 6 cm(-1) between 46 experimental and calculated levels. (C) 1996 American Institute of Physics.
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页码:1746 / 1758
页数:13
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