High-speed implementation of holographic and diffraction elements using digital micromirror devices

Evtikhiev, Nikolay N.; Zlokazov, E. Yu.; Krasnov, Vitaly V.; Rodin, Vladislav G.; Starikov, Rostislav S.; Cheremkhin, Pavel A.

doi:10.1070/qel17295

Cited by 9 publications

(4 citation statements)

References 40 publications

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“…In a number of practical problems, to input computersynthesized holographic filters into the processor, space-time light modulators with a pronounced discrete structure and a limited number of quantization levels are used [18,19]. In this case, the described approach allows to optimize the requirements for computing power and memory size for calculating the filter.…”

Section: Discussionmentioning

confidence: 99%

“…But for a number of real recognition conditions, for example, in the presence of projective distortions of the recognizable image relative to the reference one, a simple and convenient model [8] turned out to be insufficienta complete description of both spectra and holograms was required [13], which requires significant computational resources. The complication of problems solved by the Fourier holography method [14][15][16][17][18][19][20][21][22], including computer [16][17][18][19], and the corresponding complication of algorithms also actualizes the issue of adequate, visual and, which is important for practical real-time applications [16][17][18][19] of computationally inexpensive approximation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Approach to the approximation of the transfer characteristic and correlation response of Fourier holography scheme

Павлов

Gauge

Alekseev³

2022

Optics and Spectroscopy

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An approach for approximating the transfer characteristic and response in the +1th order of diffraction of a 4f Fourier holography scheme by a Gaussian-like model as applied to image processing with power-law spatial-frequency power spectra is proposed. The relations between the parameters of the approximation models and the reference image spectra are found by numerical simulation depending on the reference spectrum exponent. The approximation errors and the possibility of their optimization in the required range of spatial frequencies, determined by the nonlinearity of the exposure characteristics of holographic recording media, are shown. The validity of the approach is confirmed by comparing the results of numerical simulation with experimental data. Keywords: holography, Fourier transform, spatial frequency spectrum, impulse response, recording media, exposure characteristic.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Approach to the approximation of the transfer characteristic and correlation response of Fourier holography scheme

Павлов

Gauge

Alekseev³

2022

Optics and Spectroscopy

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“…Another popular type of spatial light modulator is based on liquid crystals. The typical frame rate for liquid crystal modulators is significantly lower than that one for DMD [11,12] and equal to 60 or 180 Hz. There are several types of liquid crystal modulators that provide higher frame rates.…”

Section: Introductionmentioning

confidence: 92%

Adaptive Digital Hologram Binarization Method Based on Local Thresholding, Block Division and Error Diffusion

et al. 2022

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High-speed optical reconstruction of 3D-scenes can be achieved using digital holography with binary digital micromirror devices (DMD) or a ferroelectric spatial light modulator (fSLM). There are many algorithms for binarizing digital holograms. The most common are methods based on global and local thresholding and error diffusion techniques. In addition, hologram binarization is used in optical encryption, data compression, beam shaping, 3D-displays, nanofabrication, materials characterization, etc. This paper proposes an adaptive binarization method based on a combination of local threshold processing, hologram division into blocks, and error diffusion procedure (the LDE method). The method is applied for binarization of optically recorded and computer-generated digital holograms of flat objects and three-dimensional scenes. The quality of reconstructed images was compared with different methods of error diffusion and thresholding. Image reconstruction quality was up to 22% higher by various metrics than that one for standard binarization methods. The optical hologram reconstruction using DMD confirms the results of the numerical simulations.

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“…Аналитического решения задачи синтеза киноформа в общем виде не существует, синтез осуществляется итерационными методами, обеспечивающими сравнительно небольшую ошибку синте-за [9]. Поскольку киноформы -полностью фазовые элементы, их невозможно использовать со сверхбыстрыми микрозеркальными (МЗ) пространственно-временными модуляторами света (ПВМС) [10][11][12][13] Второй этап нацелен на снижение ошибки синтеза по результатам первого этапа и включает применение метода прямого поиска со случайной траекторией [15,16]. Блок-схема алгоритма приведена на рис.…”

Section: Introductionunclassified

Метод Формирования Единственного Сфокусированного Порядка Дифракции При Помощи Бинарных Амплитудных Дифракционных Элементов Без Пространственной Несущей

Краснов¹,

Стариков²,

Злоказов³

2021

Оптика И Спектроскопия

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The method of synthesis of self-focusing amplitude DOE without the carrier spatial frequency working in divergent beams and forming single focused diffraction order which can occupy whole DOE reconstruction field because there is no necessity for spatial separation of diffraction orders, which is the case with holograms, is presented. Synthesis was carried out in two stages. The first one was carried out by the iteration algorithm similar to Gerchberg-Saxton algorithm, with those differences that synthesizable DOE is an amplitude one and incident wave front is divergent. Then the method of direct search with random trajectory was applied. As a result for binary amplitude DOE synthesis error of 6% and diffraction efficiency of 6% was achieved. Results of experimental DOE implementation using DMD are presented.

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High-speed implementation of holographic and diffraction elements using digital micromirror devices

Abstract: We report the results of simulations and experiments on the formation of light distributions by holograms and diffraction elements displayed by digital micromirror devices. Examples of successful experiments on the implementation of optical-digital systems based on them are demonstrated.

Cited by 9 publications

References 40 publications

Approach to the approximation of the transfer characteristic and correlation response of Fourier holography scheme

Approach to the approximation of the transfer characteristic and correlation response of Fourier holography scheme

Adaptive Digital Hologram Binarization Method Based on Local Thresholding, Block Division and Error Diffusion

Метод Формирования Единственного Сфокусированного Порядка Дифракции При Помощи Бинарных Амплитудных Дифракционных Элементов Без Пространственной Несущей

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