(Color online) Cation relative composition in atoms % of NPG (Δ) bulk samples and (•) film glasses.
Raman spectra of NPG bulk samples. Spectra have been shifted vertically to ease comparison and they are ordered according to their GeO2 molar content from G45B (65 mol%) to G41B (0 mol%).
(Color online) Raman spectra of (blue line) film glasses and (black line) corresponding bulk samples. Spectra have been shifted vertically to ease comparison, and they are ordered according to their GeO2 molar content from G10F (60 mol%) to G40F (10 mol%).
(Color online) Dispersion of the real part of the refractive index (n) of G10B bulk glass and films having the smallest (G10F) and largest (G40F) [Nb]F. The inset shows (n2-1) vs E2 (Wemple’s plot) for these glasses.
(Color online) Absorbance measured for (dash-dotted) G10B, (dashed) G10F, and (solid) G40F glasses. The inset shows the optical energy gap determined for (Δ) transparent bulk and (•) film glasses as a function of their [Nb] content. The dashed line is a guide for the eyes.
(Color online) Dependence of /χ (3)/ versus (modified Lines’ equation) for (▪) film and (□) transparent bulk glasses. (○) Values calculated using Lines’ model for transparent bulk glasses. The dashed line is a linear fit of the experimental data.
(XPbO · YNb2O5 · ZGeO2) Molar composition in mol% of bulk targets, [M]B relative element content in % ([M]B = 100 × NM/Ncat, where NM is the number of atoms of element M, with M = Pb, Nb, Ge or O and Ncat = NPb + NNb + NGe), and character of the bulk samples.
([O]F) Oxygen relative content, (OF def) Oxygen deficiency, ([Nb]F) Niobium relative content, and (%Nb4+) fraction of Nb4+ ions in the film glasses. Values are taken from Refs. 12 and 17. All data are in %.
Assignment of vibrational bands observed in the Raman spectra of bulk PbO·Nb2O5·GeO2 samples. Bands appearing as shoulders of intense bands are indicated by (s).
(Th) Thickness; ([Nb]) Niobium relative content; (nλ) linear refractive index at λ= 550 nm, 800 nm and 1480 nm; (Ed) dispersion energy; (ES) Sellmeier energy gap; (lB) characteristic bond length; (/χ(3)/exp) experimental third order optical susceptibility; (n2exp) nonlinear refractive index calculated from /χ(3)/exp by assuming a pure refractive nonlinearity (Ref. 37) and theoretical predictions from (n2BGO) BGO or (n2Lines) Lines’ models.
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