erbium

"euxenite:a lustrous, blackish-brown rare-earth mineral consisting primarily of cerium , erbium, titanium, uranium, and yttrium."

"黑稀金矿:亮的棕黑稀土矿石,铈、铒、钛、铀和钇构成."

Erbium ions concentration is obtained by the information of measured coefficients along with modeling of double-pass backward (DPB) superfluorescent fiber source (SFS).

再利用这些系数和复行后向超萤纤源的模拟，得到掺铒纤的浓度。