Advances and applications of DuPont holographic photopolymers

Gambogi, William J.; Weber, Andrew M.; Trout, T. John

doi:10.1117/12.165557

Cited by 61 publications

(22 citation statements)

References 5 publications

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“…DuPont has also developed holographic materials in which the difference in refractive index between the reactive monomers and a polymeric binder is responsible for the hologram formation. [5] In these systems, the binder acts as a supporting matrix for the monomer mixture, which preferentially diffuses and reacts in the volumes of highest irradiance. This photopolymerization process leads to a heterogeneous polymer network exhibiting a refractive-index profile that mimics the exposing irradiance pattern.…”

Section: Introductionmentioning

confidence: 99%

TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording

Sánchez

Escuti

Heesch

et al. 2005

Adv Funct Materials

119

111

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A new and efficient photopolymer for the recording of volume holograms is presented. The material comprises a mixture of UV‐sensitive acrylates and grafted titanium dioxide nanoparticles with an average size of 4 nm. We report the formation of holographic gratings with refractive‐index modulation amplitudes of up to 15.5 × 10–3—an improvement of more than a factor of four over the base material without nanoparticles—while maintaining a low level of scattering and a high transparency in the visible‐wavelength range. The influence of the composition of the acrylate system on the final properties of the holographic material is also investigated and discussed. The presence of multifunctional monomers favors the compositional segregation of the different components, while the addition of monofunctional acrylate, highly compatible with the grafting of the nanoparticles, favors the dilution of these nanoparticles.

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Section: Introductionmentioning

confidence: 99%

TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording

Sánchez

Escuti

Heesch

et al. 2005

Adv Funct Materials

119

111

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show abstract

“…- (3) the pre-exposure time under the near UV-visible lamp during preparation of the sample was 20 seconds shorter than the reference time. A compromise was defined to maximally reduce the induction period (limitation of the amount of oxygen and other inhibitions dissolved in the medium) without any decrease in chemical reactivity (the maximum value corresponded to a liquid formulation).…”

Section: Recording Of Gabor Holograms With a High Intensity Single Lamentioning

confidence: 92%

<title>Particular holographic applications developed with self-processing polymer</title>

Morlet-Savary¹,

Heinis²,

Lougnot³

1998

SPIE Proceedings

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It was shown that self-processing photopolymerizable systems can be used as holographic recording media in the field of microholography. Gabor holograms were recorded with high intensity single laser pulses. The in-line set-up involved a FD pulsed YAG laser (532 nm) and the pulse duration was about 9 ns. A power per pulse of ca 20 mJ corresponding to an energy density at the sample of 150 mJ.cm2 was capable of generating in the emulsion excited species and of inducing an efficient polymerization by a free radical mechanism. Incoherent preillumination of the sample by a suitable UV source was necessary to obtain this result with one laser pulse only. Images corresponding to these phase in-line holograms were reconstructed with fair resolution using an He-Ne laser (633 nm), a wavelength at which the polymer material is not sensitive. Apart from this, the pairing of similar emulsions with a cw green He-Ne laser (543 nm) was possible. The available power density was reduced down to 0.4 mW.cm2 and gratings diffraction efficiencies of approximately 50 % were achieved for an exposure time of 2 minutes. In that case, the purpose was to design low-cost, unsophisticated and not overly time-consuming manipulations, notably for simple demonstrations or university experiments of holography and interferometry.

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“…The two-beam interference method is used to define individual holographic gratings, each at a different recording angle, generating a sinusoidal phase modulation profile. [16][17][18][19] Here the recording and re- constructing parameters are selected so that the Bragg condition is satisfied. Therefore, there is only one diffraction order.…”

Section: Device Fabricationmentioning

confidence: 99%

Five-bit substrate guided wave true-time delay module working up to 2.4 THz with a packing density of 2.5 <inline-formula><roman>lines/cm</roman><sup><roman>2</roman></sup></inline-formula> for phased array antenna applications

Chen

1998

Opt. Eng

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A 5-bit true-time delay module is demonstrated. The combination of a 1-to-4 fiber beamsplitter and four 1-to-8 collinear guided-wave fanouts provides us with the required 32 surface-normal fanout beams with a delay step of 50 ps. The system design, device fabrication, and optimization of the fanout intensity uniformity down to Ϯ10% among 32 fanouts are addressed. The packing density of this device is 2.5 (delay lines)/cm 2 , which is the highest demonstrated thus far. A bandwidth of 2.4 THz is confirmed experimentally by employing a femtosecond laser and an ultrafast detector. © 1998 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(98)

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Advances and applications of DuPont holographic photopolymers

Cited by 61 publications

References 5 publications

TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording

TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording

<title>Particular holographic applications developed with self-processing polymer</title>

Five-bit substrate guided wave true-time delay module working up to 2.4 THz with a packing density of 2.5 <inline-formula><roman>lines/cm</roman><sup><roman>2</roman></sup></inline-formula> for phased array antenna applications

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Advances and applications of DuPont holographic photopolymers

Cited by 61 publications

References 5 publications

TiO2 Nanoparticle–Photopolymer Composites for Volume Holographic Recording

TiO2 Nanoparticle–Photopolymer Composites for Volume Holographic Recording

<title>Particular holographic applications developed with self-processing polymer</title>

Five-bit substrate guided wave true-time delay module working up to 2.4 THz with a packing density of 2.5 <inline-formula><roman>lines/cm</roman><sup><roman>2</roman></sup></inline-formula> for phased array antenna applications

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Resources

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TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording

TiO₂ Nanoparticle–Photopolymer Composites for Volume Holographic Recording