Mr. Doan Van Bac Profile

Doan Van Bac

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Proceedings Article | 15 June 2018 Paper

Holographic prism based on photo-thermo-refractive glass: new facilities for metrological application

A. Angervaks, K. Gorokhovsky, V. Granovskii, Van Bak Doan, S. Ivanov, R. Okun, N. Nikonorov, A. Ryskin

Proceedings Volume 10692, 1069208 (2018) https://doi.org/10.1117/12.2312436

KEYWORDS: Holograms, Fluctuations and noise, Glasses, Holography, Prisms, Diffraction, Metrology, Calibration

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The paper is aimed at the development of multi-valued holographic plane angle measure, so called, holographic prism. The holographic prism serves as a base of a device for calibration of equipment (swinging platforms) for navigation apparatus test on influence of rolling. The holographic prism is a small specimen of photosensitive material which a system of superimposed holographic gratings is written in, and a laser used for the gratings readout. Under the influence of the laser, a fan of diffracted beams is induced in the specimen. Consisting of the test device, the holographic prism is mounted on the platform, and while as it swings the fan moves along a photo-detector, for instance, CCD-sensor. First, fluorite was selected as a photosensitive material for the holographic prism. But it had several major drawbacks. Application of photothermo- refractive glass as the photo-sensitive material for the holographic prism manufacture permits to overcome these drawbacks. The hologram number is increased up to twenty-one. The fan proves to be very plane. The fan center is located in a domain which is of small size equal to some part of the specimen thickness (1-2 mm). The fan beams are energy-wise uniform, and every beam can be identified by using the fan in the test equipment. For instance, the beam can be coded, for its identification, by known angles between that beam and the adjacent ones. At last, the hologram recording in photothermo- refractive glass is much easier than that in fluorite.

Proceedings Article | 26 June 2017 Paper

Holographic prism based on photo-thermo-refractive glass

S. Ivanov, A. Angervaks, Doan Van Bac, N. Nikonorov, R. Okun'

Proceedings Volume 10329, 103292Z (2017) https://doi.org/10.1117/12.2270186

KEYWORDS: Holograms, Diffraction, Diffraction gratings, Refractive index, Modulation, Multiplexing, Prisms, Glasses, Holography

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New application of photo-thermo-refractive glass (PTR) named “holographic prism” is presented. In the holographic prism angles between directions are set by the holograms which create “fan” of signal beams. This kind of prism creates several signal beams which are equal to the reflections from facets of the conventional silica prism. Implementation of PTR glass as a holographic medium for this device brought us several advantages and new features. First it leads to decrease in overall size of the prism that positively affects the identification process of the beam's crosspoint. Thus, it increases sensitivity and accuracy of the measure. Second, greater value of the refractive index change in PTR glass in comparison with calcium fluoride crystal allows us to increase quantity of the recorded reference beams for the measure which leads to sensitivity increase. During this work, we established recording schedule for the PTR glass in case of the superimposed gratings recording. Was found that exposure for each grating should be equal to the 1/N fraction of the optimal exposure where N is the number of multiplexed gratings. We proved that in this case the total value of the refractive index modulation amplitude is equal to that for the single grating with optimal exposure. Considering obtained data we successfully performed recording of the holographic prism of the second modification with 14 channels.

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