Measurement of characteristics and phase modulation accuracy increase of LC SLM "HoloEye PLUTO VIS"

Bondareva, Alyona P.; Cheremkhin, Pavel A.; Evtikhiev, Nikolay N.; Krasnov, Vitaly V.; Starikov, Rostislav S.; Starikov, Sergey N.

doi:10.1088/1742-6596/536/1/012011

Cited by 13 publications

(9 citation statements)

References 9 publications

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“…The magnitude of phase flickering is connected to the selected digital addressing sequence and can be decreased by the application of other digital addressing sequences such as “5-5” or “0-6”. These schemes not only lead to lower temporal phase fluctuations but also to the reduction of the modulation range and the number of addressable phase levels [29]. To enhance the measurement process without loss of the modulation range, it is recommended to implement a LCSLM that applies analogue voltages to realise different phase shift levels (e.g., manufactured by Hamamatsu or Meadowlark).…”

Section: Discussionmentioning

confidence: 99%

Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator

Aulbach

Bloise

Lü

et al. 2017

Sensors

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The surface structure, especially the roughness, has a significant influence on numerous parameters, such as friction and wear, and therefore estimates the quality of technical systems. In the last decades, a broad variety of surface roughness measurement methods were developed. A destructive measurement procedure or the lack of feasibility of online monitoring are the crucial drawbacks of most of these methods. This article proposes a new non-contact method for measuring the surface roughness that is straightforward to implement and easy to extend to online monitoring processes. The key element is a liquid-crystal-based spatial light modulator, integrated in an interferometric setup. By varying the imprinted phase of the modulator, a correlation between the imprinted phase and the fringe visibility of an interferogram is measured, and the surface roughness can be derived. This paper presents the theoretical approach of the method and first simulation and experimental results for a set of surface roughnesses. The experimental results are compared with values obtained by an atomic force microscope and a stylus profiler.

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Section: Discussionmentioning

confidence: 99%

Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator

Aulbach

Bloise

Lü

et al. 2017

Sensors

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“…We used measured dependency 19 for sequence configuration "0-6" which provides smallest fluctuations (standard deviation is not higher than 0.07π) compared to other configurations available. This dependency is shown in Fig.…”

Section: Numerical Simulation Of Doe Optical Reconstruction With Tempmentioning

confidence: 99%

“…It is possible to neglect fluctuations by synchronizing SLM and light source or camera [19][20] , but this inevitably leads to complicating experimental setup and increase in light source requirements. There is however another way which does not include alteration of experimental setup.…”

Section: Numerical Simulation Of Doe Optical Reconstruction With Tempmentioning

confidence: 99%

“…We synthesized DOE using accurately measured [19][20] phase fluctuations of phase LC SLM "HoloEye PLUTO VIS" 13 to minimize its negative impact on displayed DOE reconstruction. Synthesis was conducted with versatile DSRT [27][28] method in the following way: 1) Initial kinoform is synthesized with conventional method such as Gerchberg-Saxton.…”

Section: Increasing Reconstruction Quality Of Kinoforms Displayed Witmentioning

confidence: 99%

“…This, however, leads to phase temporal fluctuations due to step-wise voltage addressing [17][18][19][20] . Presence of phase temporal fluctuations results in lower diffraction efficiency and reconstruction quality of displayed diffractive optical elements (DOE).…”

Section: Introductionmentioning

confidence: 99%

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Increasing reconstruction quality of diffractive optical elements displayed with LC SLM

et al. 2015

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Phase liquid crystal (LC) spatial light modulators (SLM) are actively used in various applications. However, majority of scientific applications require stable phase modulation which might be hard to achieve with commercially available SLM due to its consumer origin. The use of digital voltage addressing scheme leads to phase temporal fluctuations, which results in lower diffraction efficiency and reconstruction quality of displayed diffractive optical elements (DOE). Due to high periodicity of fluctuations it should be possible to use knowledge of these fluctuations during DOE synthesis to minimize negative effect. We synthesized DOE using accurately measured phase fluctuations of phase LC SLM "HoloEye PLUTO VIS" to minimize its negative impact on displayed DOE reconstruction. Synthesis was conducted with versatile direct search with random trajectory (DSRT) method in the following way. Before DOE synthesis begun, two-dimensional dependency of SLM phase shift on addressed signal level and time from frame start was obtained. Then synthesis begins. First, initial phase distribution is created. Second, random trajectory of consecutive processing of all DOE elements is generated. Then iterative process begins. Each DOE element sequentially has its value changed to one that provides better value of objective criterion, e.g. lower deviation of reconstructed image from original one. If current element value provides best objective criterion value then it left unchanged. After all elements are processed, iteration repeats until stagnation is reached. It is demonstrated that application of SLM phase fluctuations knowledge in DOE synthesis with DSRT method leads to noticeable increase of DOE reconstruction quality.Keywords: liquid crystal spatial light modulator, phase temporal fluctuations, direct binary search with random trajectory method, phase diffractive optical elements, image reconstruction.

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Object image reconstruction: method for reconstructing images from digital off-axis holograms using a generative adversarial network

Kiriy,

Svistunov,

Rymov

et al. 2024

Meas Tech

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Measurement of characteristics and phase modulation accuracy increase of LC SLM "HoloEye PLUTO VIS"

Cited by 13 publications

References 9 publications

Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator

Non-Contact Surface Roughness Measurement by Implementation of a Spatial Light Modulator

Increasing reconstruction quality of diffractive optical elements displayed with LC SLM

Object image reconstruction: method for reconstructing images from digital off-axis holograms using a generative adversarial network

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