Holographic reflection gratings recorded in silver halide emulsions: combination of several developer agents based on ascorbic acid

P. Mas-Abellán; R. Madrigal; A. Fimia

doi:10.1117/12.2522117

23 April 2019 Holographic reflection gratings recorded in silver halide emulsions: combination of several developer agents based on ascorbic acid

P. Mas-Abellán, R. Madrigal, A. Fimia

Author Affiliations +

Proceedings Volume 11030, Holography: Advances and Modern Trends VI; 110301F (2019) https://doi.org/10.1117/12.2522117
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

Silver Halide emulsions have been considered one of the most energetic sensitive materials for holographic applications, due to a high energy sensitivity and wide spectral sensitivity. Based on these characteristics and the appearance of Ultrahigh resolution silver halide emulsions, have been performed Silver Halide Sentitized Gelatin (SHSG) holograms, it is high-sensitivity recording grattings, performed with laser wavelengths anywhere within the visible spectrum and high diffraction efficiencies, getting the final hologram with properties similar to a Dichromated Gelatin (DCG) hologram. This simplifies the manufacturing of high-quality, large-format Holographic Optical Elements (HOE’s). In this communication we studied several development processes of Silver halide emulsions, more concretely we analyze the influence of a combination of different developer agents, from a single one up to 4 developer agents, based on ascorbic acid developer agent. We studied the influence of the developer combinations and its effects on the transmission spectra for a wide exposure range by use of 9 μm thickness films of ultrafine grain emulsion BB640, exposed to single collimated beams using a red He-Ne laser (wavelength 632.8 nm) with Denisyuk configuration obtaining a spatial frequency of 4990 l/mm recorded on the emulsion, with an energetic sensitivity of 100 μJ/cm2. The experimental results show that an optimized solution (pH and development time) of ascorbic acid as the only developer agent could be the best solution to get high efficiency reflection diffraction gratings (up to 90%) and up to 70 nm of bandwidth.

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P. Mas-Abellán, R. Madrigal, and A. Fimia "Holographic reflection gratings recorded in silver halide emulsions: combination of several developer agents based on ascorbic acid", Proc. SPIE 11030, Holography: Advances and Modern Trends VI, 110301F (23 April 2019); https://doi.org/10.1117/12.2522117

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KEYWORDS

Diffraction gratings

Diffraction

Silver

Holography

Sodium

Carbonates

Modulation

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