Solid-state luminescent filters for neodymium lasers

Correlation of defect centers with photoinduced second-harmonic generation in Er- and Sm-doped aluminosilicate fibers

“…Sm 21 in aluminosilicate glasses is known to have an absorption band with the maximum near 300 nm. 15 That is why only the long-wavelength edge of this band can be identified in Fig. 2(a).…”

“…14 One may suppose that the formation of divalent RE ions during the glass synthesis was facilitated by the presence of Al in the fibers. 15 Divalent RE ions have broad absorption bands in the visible part of the spectrum. 16 It is quite possible that the observed change of absorption of a broad band with the maximum at 400 nm [see Fig.…”