1. 1 E. Snitzer , “Optical Maser Action of Nd+3 in A Barium Crown Glass,” Phys. Rev. Lett., 7 [12] 444-6 (1961).
2. 2 J. H. Campbell and T. I. Suratwala , “Nd-Doped Phosphate Glasses for High-Energy/High-Peak Power Lasers,” J. Non-Cryst. Solids, 263264, 318-41 (2000).
3. 3 S. D. Jackson , “Continuous Wave 2.9 μm Dysprosium-Doped Fluoride Fiber Laser,” Appl. Phys. Lett., 83, 1316-8 (2003).
4. 4 Y. Zheng and A. G. Clare , “Rare Earth Doped Glasses for Conversion of Near Ultraviolet Light to White Light,” Phys. Chem. Glasses, 46 [4] 467-71 (2005).
5. Lasers and Excited States of Rare Earths