Computer generated holograms: fabrication and application for precision optical testing

Полещук, А. Г.; Korolkov, V. P.; Насыров, Р. К.; Asfour, Jean-Michel

doi:10.1117/12.797816

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Among all the fabrication errors, the substrate error is dominant and is typically of low spatial frequency. Substrate error usual means substrate surface variation from its ideal shape and can be measured by using a testing beam or a collimated beam [5]. Usually method is to subtract the non-zero order surface measurement from the zero order measurement, and the CGH substrate error can be correctly removed [9], [11].…”

Section: A the Calibration Of The Cgh Substrate Twementioning

confidence: 99%

“…With the aid of alignment hologram, the location of CGH can be well aligned. CGH can be manufactured by e-beam writing or laser direct writing with high-precision and high-resolution [5], but there are some unkown factors during the fabrication process. In this paper, we focus on the CGH substrate TWE, which is dominant in the cylindrical wavefront.…”

Section: Introductionmentioning

confidence: 99%

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Calibrating CGH Substrate TWE and Simulating Adjustment Error in Cylindrical Surface Measurement

Zhang

Han

et al. 2022

IEEE Photonics J.

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Computer-generated hologram (CGH) is a diffractive optical element that has been commonly used as wavefront corrector in the interferometer and can be accurately manufactured to meet the requirements of high-precision detection. But the transmitted wavefront error (TWE) of the CGH substrate and the adjustment errors of cylindrical surface are influence factors of high accuracy measurement. In this paper, we propose the method of calibrating the CGH substrate TWE. After calibrating, the substrate TWE is 0.0052λ (RMS). Meanwhile, we obtain the general expression for the misalignment aberrations by describing the relationship between the wavefront of the measured cylindrical mirror and the corresponding adjustment errors. Then the adjustment errors of the test cylindrical surface can be completely separated by subtracting the fitting function from the measurement on the basis of least-square algorithm. After that, the PV value changes from 3.0565λ to 0.9825λ, and the RMS value changes from 0.5278λ to 0.1273λ, the measurement results have been greatly improved.

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Section: A the Calibration Of The Cgh Substrate Twementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calibrating CGH Substrate TWE and Simulating Adjustment Error in Cylindrical Surface Measurement

Zhang

Han

et al. 2022

IEEE Photonics J.

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“…The measurement methods suited for this purpose can be divided into two categories: pointwise and areal. The pointwise methods can be further separated into those using tactile probes [4] and optical point sensors [5], whereas areal methods are typically used by interferometric [6,7] or deflectometric [8,9] measurement systems. Pointwise methods are highly adaptable since they are often not subject to any fundamental limitations with respect to the surface forms they can measure.…”

Section: Introductionmentioning

confidence: 99%

Experimental Design for Virtual Experiments in Tilted-Wave Interferometry

et al. 2022

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The tilted-wave interferometer (TWI) is a recent and promising technique for optically measuring aspheres and freeform surfaces and combines an elaborate experimental setup with sophisticated data analysis algorithms. There are, however, many parameters that influence its performance, and greater knowledge about the behavior of the TWI is needed before it can be established as a measurement standard. Virtual experiments are an appropriate tool for this purpose, and in this paper we present a digital twin of the TWI that was carefully designed for such experiments. The expensive numerical calculations involved combined with the existence of multiple influencing parameters limit the number of virtual experiments that are feasible, which poses a challenge to researchers. Experimental design is a statistical technique that allows virtual experiments to be planned such as to maximize information gain. We applied experimental design to virtual TWI experiments with the goal of identifying the main sources of uncertainty. The results from this work are presented here.

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“…JSC LZOS has been using Computer Generated Holograms (CGH) [1][2][3] for testing of surfaces of largedimensioned optical components for astronomical and space application for many years. They are applied in the process of testing of aspherical surface figure, testing of off-axis aspherical surfaces with fixing of off-axis parameters and mirror orientation, testing of aspherical surface vertex position with respect to the mirror geometrical center, mutual alignment of mirrors in test scheme, etc.…”

Section: Introductionmentioning

confidence: 99%

Computer Generated Holograms (CGH) for Testing, Alignment and Positioning of Astronomical and Space Mirrors Aspherical Surfaces

Semenov¹,

Abdulkadyrov²,

Dobrikov³

et al. 2019

EPJ Web Conf.

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JSC LZOS successfully applies Computer Generated Holograms (CGH) for testing of on- and off-axis surfaces of large-dimensioned optical components for their alignment with respect to interferometer, for defining of aspherical surface optical vertex position with respect to the geometrical center and for optical systems alignment. All this allows producing of large-dimensioned aspherical on- and off-axis astronomical and space mirrors with high accuracy.

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Computer generated holograms: fabrication and application for precision optical testing

Abstract: An overview of recent results in fabrication and application of new types of high precision CGHs for interferometric aspherical testing is presented.

Cited by 10 publications

References 7 publications

Calibrating CGH Substrate TWE and Simulating Adjustment Error in Cylindrical Surface Measurement

Calibrating CGH Substrate TWE and Simulating Adjustment Error in Cylindrical Surface Measurement

Experimental Design for Virtual Experiments in Tilted-Wave Interferometry

Computer Generated Holograms (CGH) for Testing, Alignment and Positioning of Astronomical and Space Mirrors Aspherical Surfaces

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