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Volumn 108, Issue 16, 1998, Pages 6892-6896

Submicron confocal Raman imaging of holograms in multicomponent photopolymers

Author keywords

[No Author keywords available]

Indexed keywords

CHEMISTRY; COMPOSITION; DENSITY (SPECIFIC GRAVITY); HOLOGRAMS; IMAGING TECHNIQUES; LIGHT MODULATION; MOLECULAR DYNAMICS; MOLECULES; MORPHOLOGY; PHYSICAL PROPERTIES; REFRACTIVE INDEX; SWELLING;

EID: 0032049363     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.476104     Document Type: Article
Times cited : (14)

References (34)
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    • note
    • This formulation is initially liquid. Solid photopolymer media are prepared by depositing the formulation between two glass plates separated by ∼ 100 μm Teflon™ spacers and are precured by exposure for 80 s to 547 nm light filtered from a Hg lamp. The precure strategy is discussed in Ref. 4(a). IR measurements show the polymer formulation is precured to ∼ 80% consumption of acrylate/vinyl groups.
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    • note
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    • -1 has higher signal to noise. For peak C, we subtract underlying peaks from IBA and VNA.
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    • NMR measurements show complete consumption of NVP into the matrix at 80% precure.
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    • We simulate the loss in contrast for sinusoidal gratings with the periods of holograms (I)-(IV) imaged by the Airy distribution of our diffraction limited spot. The loss in contrast ranges from 7% for grating (I) to 39% for grating (IV).
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    • VNA=1.63 is extrapolated from eleven samples of polymerized VNA/formulation varying the VNA volume fraction from 0 to 0.10.
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    • The components' concentration variations are expressed in terms of their volume fractions. Nonzero density modulations appear as a sum of volume fractions not equal to one. The modulation in a component's volume fraction represents the increase in the number of its molecules within the imaging volume. We normalize the components' volume fractions in each region to obtain the refractive index originating only from the photopolymer's composition without any density contributions. To calculate the density contributions to Δn we use the concentration modulations to calculate Δρ and apply the Lorentz-Lorenz relation to relate Δn to Δρ.
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    • note
    • -4 are reasonable; K. R. Amundson, private communication.


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