Full-color holographic diffuser using time-scheduled iterative exposure

Piao, Mei-Lan; Kang, Hoonjong; Lee, Kwon-Yeon; Kim, Nam

doi:10.1364/ao.54.005252

Cited by 31 publications

(18 citation statements)

References 18 publications

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“…In the work of Piao et al 5 a sequential exposure method is used to improve the efficiency of color transmission holograms. That method consists in exposing the material alternately to each laser for short periods of time, with the set of exposures repeating a determined number of cycles.…”

Section: Sequential Exposurementioning

confidence: 99%

“…Recently, the German company Covestro (formerly Bayer MaterialScience) has developed a panchromatic photopolymer, Bayfol® HX 102, which allows the recording of colour holograms 4 . It is a self-developing photopolymer; the polymerization (and so, the hologram formation) begins when it is illuminated with the recording beams, so recording with different wavelengths requires simultaneous or sequential exposure 5 . Photopolymers have become very popular in holography since some do not require any post-exposure treatment or, in the worst case, only require dry processing.…”

Section: Introductionmentioning

confidence: 99%

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True colour Denisyuk-type hologram recording in Bayfol HX self-developing photopolymer

et al. 2017

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True colour Denisyuk-type hologram recording of diffusing objects in Bayfol® HX 102 self-developing photopolymer has been studied. In a first stage, monochromatic Denisyuk holograms of a standard white diffuser (Spectralon) have been recorded using lasers with wavelengths 442, 532 and 633 nm to determine the optimum exposure that gives maximum efficiency. The recording of holograms from a diffusing object has the particularity that intermodulation noise due to interference between waves arriving from different object points reduces effective index modulation. A maximum effective efficiency of 80% has been reached for monochromatic recording. In a second stage, a set of experiments has been carried out to determine the adequate relation of exposure for the recording of a Denisyuk hologram of the standard white diffuser with the three lasers simultaneously to get the maximum efficiency for each wavelength. With the determined optimal exposure, a hologram of a polychromatic diffusing object has been recorded, obtaining a good visual coincidence between hologram and original object.

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Section: Sequential Exposurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

True colour Denisyuk-type hologram recording in Bayfol HX self-developing photopolymer

et al. 2017

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“…Many applications of HOEs exploit their flexibility in performing optical functions and their see-through characteristics. HOEs have been applied to head-up displays (HUDs) [4], head-mount displays (HMDs) [2,[4][5][6][7][8], bidirectional displays [9], see-through diffusive screens [10] projectiontype three-dimensional (3-D) displays [11][12][13][14], 3-D user interfaces [15], wearable eye-gaze detection systems [16], solar-power generation systems [17], vibration and temperature measurements [18,19], and 3-D telepresence systems [20].…”

Section: Introductionmentioning

confidence: 99%

Holographic Pepper’s Ghost: Upright Virtual-Image Screen Realized by Holographic Mirror

Nakamura¹,

Takahashi²,

Aburakawa³

et al. 2019

Holographic Materials and Applications

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A holographic mirror is a reflection-type holographic optical element that works as an off-axis mirror. It realizes an upright see-through screen serving as a virtualimage display and virtual camera. Such screen enables to realize virtual-imagebased attractive applications like Pepper's ghost only with a thin optical system. This chapter describes the concept of a holographic-mirror-based virtual-image display and virtual camera, an experimental method for exposing the holographic mirror based on holographic printing, methods for dispersion compensation, and experimental results for the proposed virtual-image display and camera.

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“…This method differs from other techniques used for producing holographic diffusers, where a pulsed laser is used for patterning a photopolymer layer coated onto a plastic or glass substrate. 21,22 In contrast to this, we perform direct laser ablation of float glass substrates (without any polymer coating) for the production of tailored surface textures and roughness. The proposed new fabrication approach allows functional microstructures (topographies) to be created on float glass substrates to distribute light efficiently.…”

Section: Introductionmentioning

confidence: 99%

Nanosecond pulsed laser texturing of optical diffusers

et al. 2017

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High-quality optical glass diffusers have applications in aerospace, displays, imaging systems, medical devices, and optical sensors. The development of rapid and accurate fabrication techniques is highly desirable for their production. Here, a micropatterning method for the fast fabrication of optical diffusers by means of nanosecond pulsed laser ablation is demonstrated (λ=1064 nm, power=7.02, 9.36 and 11.7 W and scanning speed=200 and 800 mm s-1). The experiments were carried out by point-to-point texturing of a glass surface in spiral shape. The laser machining parameters, the number of pulses and their power had significant effect on surface features. The optical characteristics of the diffusers were characterized at different scattering angles. The features of the microscale structures influenced average roughness from 0.8 μm to 1.97 μm. The glass diffusers scattered light at angles up to 20° and their transmission efficiency were measured up to ∼97% across the visible spectrum. The produced optical devices diffuse light less but do so with less scattering and energy losses as compared to opal diffusing glass. The presented fabrication method can be applied to any other transparent material to create optical diffusers. It is anticipated that the optical diffusers presented in this work will have applications in the production of LED spotlights and imaging devices.

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Full-color holographic diffuser using time-scheduled iterative exposure

Cited by 31 publications

References 18 publications

True colour Denisyuk-type hologram recording in Bayfol HX self-developing photopolymer

True colour Denisyuk-type hologram recording in Bayfol HX self-developing photopolymer

Holographic Pepper’s Ghost: Upright Virtual-Image Screen Realized by Holographic Mirror

Nanosecond pulsed laser texturing of optical diffusers

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