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Structural origin of the nonlinear optical properties of lead niobium germanate film glasses
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10.1063/1.3608172
/content/aip/journal/jap/110/2/10.1063/1.3608172
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/2/10.1063/1.3608172

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Cation relative composition in atoms % of NPG (Δ) bulk samples and (•) film glasses.

Image of FIG. 2.
FIG. 2.

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%).

Image of FIG. 3.
FIG. 3.

(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%).

Image of FIG. 4.
FIG. 4.

(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.

Image of FIG. 5.
FIG. 5.

(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.

Image of FIG. 6.
FIG. 6.

(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.

Tables

Generic image for table
Table I.

(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.

Generic image for table
Table II.

([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 %.

Generic image for table
Table III.

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).

Generic image for table
Table IV.

(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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/content/aip/journal/jap/110/2/10.1063/1.3608172
2011-07-27
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural origin of the nonlinear optical properties of lead niobium germanate film glasses
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/2/10.1063/1.3608172
10.1063/1.3608172
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