Asymmetrization of the profile of a dynamic holographic grating on the basis of particularly local information

Venediktov, Vladimir Yu.; Freygang, Nikolay N.

doi:10.1134/s0030400x08020240

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…Additional digital processing witch we are planning to implement will allow on-the-fly hologram anti-symmetrization to achieve up to 99% efficiency while using high performance spatial light modulators [1][2][3][4][5]. Up to 60 Hz update rates are possible with SLM as limiting factor.…”

Section: Resultsmentioning

confidence: 98%

“…Because of this spatial resolution of the interferograms was lower than 1 line per mm., but it was still enough to achieve decent results. Without profile antisymmetrization diffraction efficiency was limited to theoretical 33%, and even lower in reality, but it is possible to process them and greatly increase hologram efficiency [1]. In addition, without profile anti-symmetrization it is impossible to restore original beam tilt direction (for example left or right), beam will be reconstructed in both ±1 orders of diffraction.…”

Section: Fig 5 Resultsmentioning

confidence: 99%

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Incoherent holography with the use of Shack-Hartmann wavefront sensor

et al. 2015

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The paper considers the use of Shack-Hartmann sensor for hologram recording. Despite all the advantages coherent digital holography is limited while fixing ultrafast or short-lived processes, as well as self-luminous objects. The solution to this problem is the use of incoherent digital holography (DIH). It allows to make such observations which is especially important in microscopy. Previously for registration of incoherent digital holograms only schemes based on a Michelson interferometer were used. In this experiment we decided to use Shack-Hartmann sensor to obtain simple pseudo hologram and reconstruct it using electronically-addressed spatial light modulator.

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Section: Resultsmentioning

confidence: 98%

Section: Fig 5 Resultsmentioning

confidence: 99%

Incoherent holography with the use of Shack-Hartmann wavefront sensor

et al. 2015

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“…It would be expected that the diffraction efficiency is asymmetric relative to the angle of incidence. [7][8][9][10] In this paper, we propose a new efficient approach to record the thin dynamic phase grating (refractive index grating) with an asymmetric fringe profile in the LC cell. The firstorder DE exceeds the theoretical limit for symmetric profile gratings.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric dynamic phase holographic grating in nematic liquid crystal

et al. 2016

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A new scheme for recording a dynamic phase grating with an asymmetric profile in C 60 -doped homeotropically aligned nematic liquid crystal (NLC) was presented. An oblique incidence beam was used to record the thin asymmetric dynamic phase holographic grating. The diffraction efficiency we achieved is more than 40%, exceeding the theoretical limit for symmetric profile gratings. Both facts can be explained by assuming that a grating with an asymmetric saw-tooth profile is formed in the NLC. Finally, physical mechanism and mathematical model for characterizing the asymmetric phase holographic grating were presented, based on the photo-refractive-like (PR-like) effect.

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