Holographic recording aspects of high-resolution Bayfol HX photopolymer

The spectroscopic studies of near infrared emission arising from supernovae allow to derive crucial quantities that could better characterise physical conditions of the expanding gas, such as the CaII IR HVF spectral feature. For this reason is mandatory to have Diffractive Optical Elements (DOEs) with a spectral coverage in the range 8000 -10000Å (for low z sources) combined with a reasonable Signal to Noise Ratio (S/N) and medium-low resolution. In order to cope with all of those requirements we developed a Volume Phase Holographic Grating (VPHG) based on an innovative photosensitive material, developed by Bayer MaterialScience. We demonstrated the capabilities of this new DOE through observation of SN 2013fj as case study at Asiago Copernico Telescope where AFOSC spectrograph is available.

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“…nal achieved ∆n strongly depends upon the exposure power density as reported by Berneth et al (2011).…”

Section: The Device Vph6 At Afoscmentioning

confidence: 57%

A New Photopolymer-based VPHG for Astronomy: The Case of SN 2013fj

Zanutta¹,

Landoni²,

Bianco³

et al. 2014

Publications of the Astronomical Society of the Pacific

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“…We showed that the recording process in Bayfol ® HX film can be successfully described within a non-local reaction-diffusion model 6,7 . In a nutshell, a reaction-diffusion mechanism is governed by two basic time scales, the reaction time τ R , characterizing the speed of monomer conversion, and the diffusion time τ D needed for a monomer to travel from a dark fringe to the adjacent bright fringe.…”

Section: How Higher Harmonics Of the Index Profile In Volume Phase Grmentioning

confidence: 98%

“…A fully detailed non-local reaction-diffusion model was established for Bayfol ® HX film 6 . Within this model favorable recording conditions and photopolymer grade optimization could be done 7 . These new instant developing recording media open up new opportunities to create vHOEs for new diffractive optics and have proven to be able to record predictable and reproducible optical properties.…”

Section: New Photopolymer Materials Provide Consistent Recording Resumentioning

confidence: 99%

Edge-lit volume holograms recorded by free space exposure: diffraction by 2^ndHarmonics in Bayfol HX film

et al. 2015

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Miniaturization of optical components, specifically the reduction in thickness created by using planar optical devices, makes light manipulation by diffraction more and more attractive. Optical gratings based on volume Holographic Optical Elements (vHOEs) have the advantage over surface gratings as they reconstruct only a single diffraction order and hence provide high diffraction efficiencies, selectivity and remain fully transparent in the off-Bragg condition.Guiding light inside an optically transparent medium by total internal reflection (TIR) is common and useful in thin planar optical devices. vHOEs offer unique ways to create selective in-and out-coupling of TIR light. As such vHOEs typically have to be recorded in an edge-lit configuration as the necessary high diffraction angles could not be generated by two free-space beams outside the medium. To record such an edge-lit vHOE, bulky recording blocks or liquid baths are used in complex and hard to align recording setups.We present in this paper our findings to use instant-developing photopolymer film (Bayfol ® HX) to generate 2 nd harmonics in the index profile of phase gratings while using free-space recording setups. Those 2 nd harmonic components enable the vHOE to diffract at such large angles that they replay in an edge-lit configuration. We will discuss in this paper selected materials and beneficial recording parameters to tune the diffraction efficiency towards 2 nd harmonic replay. By this -in reported specific cases -the cumbersome and complex edge-lit recording can be substituted by easy-to-use free-space setups. This process significantly simplifies master recordings for vHOEs with edge-lit functionalities which later can be used in contact copy schemes for mass replication.

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“…These new instant developing recording media open up new opportunities to create vHOEs for new diffractive optics and have proven to be able to record predictable and reproducible optical properties. This was demonstrated recently also for transmission holograms and directional diffusors [5][6][7][8][9].…”

Section: Photopolymeric Materials Characterizationmentioning

confidence: 99%

“…The newly [4][5][6] developed photopolymer film technology (Bayfol ® HX film) evolved from efforts in holographic data storage (HDS) [4][5][6][7] where any form of post processing is unacceptable. These new instant developing recording media open up new opportunities to create vHOEs for new diffractive optics and have proven to be able to record predictable and reproducible optical properties.…”

Section: Photopolymeric Materials Characterizationmentioning

confidence: 99%