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[2] [2] Schott laser glasses, Schoit Glass Tecbiiologiee Inc USA

[3] [3] The Kigre family of laser glasses, Kigre Inc. USA, 1982

[6] [6] JiaDg Yasi et al., J. Non-Gryst. Solides, 80, 623 (1986)

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[8] [8] Strobel S. A. et al., Appl Phys. Lett., 45(11), 171 (1984)

[9] [9] Yan L. et al., Opt. Lett., 11 (8), 502 (1986)