Correction of Telescope's Primary using Dynamic Holography in Optically Addressed Liquid Crystal Spatial Light Modulator

Berenberg, Vladimir A.; Leshchev, Alexey; Semenov, Pavel M.; Vasil'ev, Michael V.; Venediktov, Vladimir Yu.

doi:10.1080/10587250008023247

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Thus the coefficients aI2 = DE represent the diffraction efficiency to the n-th order of diffraction for the values of n, corresponding to the propagating waves. In particular, in accordance with (5), in the first order of diffraction (n=1) (and further we shall show that the corresponding diffraction efficiency can be very close to 100%), the wavefront of the diffracted wave will contain the wavefront, phase conjugated with respect to the reading out wave, and the nonconjugated wavefront of the referent wave.…”

Section: Erd/mentioning

confidence: 60%

“…Especially spectacular results were demonstrated (see, for example, [3][4][5]) with the use of dynamic holographic correctors, recorded in optically addressed liquid crystal spatial light modulators (OA LC SLM) [6]. Special feature of such devices is that in this case dynamic holograms are practically thin, and thus free from spectral and angular limitations, usual for thick holograms.…”

Section: Introductionmentioning

confidence: 99%

“…Taking into account the initial conditions:(O, x, y) = 0, 1(0, x, y) = 'rr @)[1 + p(O) cos -rd(x, y) + ''rf (x, y)}+ }}(4) the relationships(1)and(3)completely solve the problem of evaluation of spatial distribution of light intensity I(t,x,y) on the photosensitive layer of OA SLM and thus of the spatial profile of the dynamic grating y1(t,x,y). One can see from the relationships (1), (3) and (4), that light intensity I and phase retardation c1 are the periodical functions ofthe variable J: J = x/A rd (x, y) + Prf(X, y) ),(5) I.e. I(t,x,y) = I(t,J), 'i(t,x,y) = 1(t,J) and I(t,J+l) = I(t,J), ct(t,J+l) = t(t,J).…”

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confidence: 98%

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<title>Analogous, completely optical scheme of record of blazed dynamic holograms</title>

et al. 2002

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In recent experiments of M.Gruneisen et al., the possibility was shown to record the so-called "blazed" dynamic holograms in optically addressed liquid crystal spatial light modulator (OA LC SLMs). In such holograms the phase retardation distribution across the holographic fringe has a saw-like shape (asymmetrical triangle). Such holograms can provide a very high (in a limit -nearly 100%) diffraction efficiency. In previous experiments such "blazed" holograms were recorded with the use of digital computer methods. We propose a novel, analogous and completely optical approach to the record of such holograms. One can record a saw-like profile of phase retardation in an OA SLM, placed into the nonlinear interferometer. In such interferometer the probe wave reads out the phase retardation in SLM, interferes with reference wave, and the phase retardation in the said SLM is controlled by their interference pattern. The results of the direct numerical simulation of the system show that by this method can be formed the saw-like grating, providing nearly 100% diffraction efficiency. Presented is the analysis of the system dynamics and stability.

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Section: Erd/mentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

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confidence: 98%

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<title>Analogous, completely optical scheme of record of blazed dynamic holograms</title>

et al. 2002

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Characterization of submillisecond response optical addressing phase modulator based on low light scattering polymer network liquid crystal

Zhao

Liu

Duan

et al. 2015

Journal of Applied Physics

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Optically addressed conventional nematic liquid crystal spatial light modulator has attracted wide research interests. But the slow response speed limited its further application. In this paper, polymer network liquid crystal (PNLC) was proposed to replace the conventional nematic liquid crystal to enhance the response time to the order of submillisecond. The maximum light scattering of the employed PNLC was suppressed to be less than 2% at 1.064 μm by optimizing polymerization conditions and selecting large viscosity liquid crystal as solvent. The occurrence of phase ripple phenomenon due to electron diffusion and drift in photoconductor was found to deteriorate the phase modulation effect of the optical addressed PNLC phase modulator. The wavelength effect and AC voltage frequency effect on the on state dynamic response of phase change was investigated by experimental methods. These effects were interpreted by electron diffusion and drift theory based on the assumption that free electron was inhomogeneously distributed in accordance with the writing beam intensity distribution along the incident direction. The experimental results indicated that the phase ripple could be suppressed by optimizing the wavelength of the writing beam and the driving AC voltage frequency when varying the writing beam intensity to generate phase change in 2π range. The modulation transfer function was also measured.

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

Venediktov

Freygang

2008

Opt. Spectrosc.

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Correction of Telescope's Primary using Dynamic Holography in Optically Addressed Liquid Crystal Spatial Light Modulator

Cited by 5 publications

References 11 publications

<title>Analogous, completely optical scheme of record of blazed dynamic holograms</title>

<title>Analogous, completely optical scheme of record of blazed dynamic holograms</title>

Characterization of submillisecond response optical addressing phase modulator based on low light scattering polymer network liquid crystal

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

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