No material can record both the phase and amplitude of the electric eld. Holographic optical elements for holographic stereogram. Optical system in lighttools rsoft bsdf files for each grating were used to define the surface properties of the appropriate area in lighttools. Feb 05, 2015 threedimensional holographic head mounted display using holographic optical element heejae kim, sungkeun lee, meilan piao, nam kim and jaehyeung park. The volume holographic optical elements at the incidence of the bragg angle or close to the bragg angle can obtain effective wavefront reconstruction 1518. The volume holographic optical elements at the incidence of the. Holographical optical elements hoe sustainable energy. Design of diffractive optical elements for augmentedvirtual reality applications. Abstract in this research, holographic optical element applied for beautification recorded in holographic surface relief photoresist. This excerpt gives a succinct explanation of holographic optical elements. Our hoe products includes, holographic reticles holographic transmission grating holographic reflection grating holographic lens holographic diffuser holographic photonic crystal holographic quasi photonic crystal holographic coupler holographic beam splitter holographic beam combiner. Holographic optical elements hoes have been used as important tools for implementing augmented reality ar and seethrough displays because they are transparent and thin. Users are able to rotate the axes of optical properties to achieve the tilted grating profile grating4 grating3 grating2 grating1 epe grating input grating.
The content of this chapter is focused on holographic optical. Diffractive optical elements does shape and split laser beams in an energyefficient manner. Fortunately, the interference intensity pattern can also be translated into phase. The coherent backlight unit blu using a holographic optical element hoe for fullcolor flatpanel holographic display is proposed. Projectiontype seethrough holographic threedimensional. The elements are recorded with complex wavefronts that are derived recursively from interim holograms. An added benefit is scalability, which indeed merits its own section in this document as a significantly challenging issue. Friesem we present novel, to our knowledge, methods for the analytical design and recording of planar holographic. Computeroriginated planar holographic optical elements. Close hughes research laboratories united states this article is a survey of the.
A method for designing and recording holographic optical elements, using recursive techniques, has been developed. The main parameters of various types of such elements are given, along with examples of using them in optical technology and instrumentation. The formation of spurious gratings due to boundary. The first and still the finest prepress house in kerala, process color, kochi, india. Threedimensional holographic head mounted display using. Diffractive and holographic optics as optical combiners in head mounted displays pdf, adjunct publication of. The illumination area of backlight is 150 mm x 90 mm and the thickness is 10 mm, which is slim compared to other conventional coherent backlight units. Moreover, as hoes usually come in the shape of a thin film, they can be bent, used for coating, or attached to curved surfaces. Analysis of optical properties of offaxis reflective volume. Online access to spie ebooks is limited to subscribing. In this chapter, the principle and characteristics of the holographic optical elements are described in detail, and few typical holographic optical elementbased applications, such as headmounted. The hoe layers are almost free from diffraction unlike spatial light modulator layers, which makes this additive light field display more advantageous when modifying the number of layers, thickness, and pixel density compared with conventional compressive displays. Curved holographic optical elements and applications for curved seethrough displays article pdf available in journal of information display february 2019 with 601 reads how we measure reads. Threedimensional holographic head mounted display using holographic optical element heejae kim, sungkeun lee, meilan piao, nam kim and jaehyeung park.
Holographic optical elements encoded security holograms. How to integrate volume holographic optical elements vhoe. Existing optical technologies are also benefiting from the led. We have developed and investigated the use of holographic optical elements hoes and i holographic transssoo gratings for scanning ridiu tekscopes. Pdf holographic optical element has a high diffraction efficiency and a.
These holographic optical elements hoe have the advantage of being cheap due to their simple design, small size, low weight and are easily reproducible by embossing polymer materials. Schwemmer laboratory for atmospheres, nasa goddard space flight center, greenbelt, maryland, 2077 1 richard. Rajan, and became a name to reckon with in high security hologram manufacturing. Diffractive elements can be singleorder or multiorder patterning resolution x area sbwp is a measure of absolute design freedom phase encoding techniques provide the effective design freedom very. Close hughes research laboratories united states this article is a survey of the characteristics, technology and applications of holographic optical elements hoes, considered as general elements in an optical system. It begins with functional design, which can even be imported from e. Ignetta holographics security holograms and holographic. Holographic optical elements for the extremeultraviolet. Testing of holographic optical elements for holographic gun. Diffractive elements can be singleorder or multiorder patterning resolution x area sbwp is a measure of absolute design freedom phase encoding techniques provide the effective design freedom very large sbwp can be made by combining holographic recording with computed does diffractive optical element basic functions. Osa slim coherent backlight unit for holographic display. Analysis of optical properties of offaxis reflective. Direct light incident on the hoe glazing at a specific angle is redirected at a predefined angle via diffraction at the holographic interlayer as demonstrated in figure 1.
The idea of a holog raphy is to encode the phase information into intensity variation. Conventional methods of measuring the various parameters of holographic optical elements are tedious for mass production. The principles and techniques for obtaining them are explained. Holographic optical elements and application intechopen. Transparent holographic optical elements for display applications. Computeroriginated aspheric holographic optical elements. Luminit thcs use highly efficient holographic optical elements that direct light beams without the need for bulky and expensive optics. From fundamentals to advanced experiments and applications, this book explains how holography works. Popular summary holographic optical elements as scanning. In an amplitude hologram, the phase information is recorded as transmission variation optical density variation.
Holographical optical elements hoe hoe for high efficient illumination, solar control and pv power in buildings. Holographic optical elements, optical engineering 10. The holograms recorded in this film have properties of. Holographic optical elements hoes have been widely studied of late for use as novel optical components of display devices. Computer originated aspheric holographic optical elements r. This 1996 book is a greatly expanded edition of what has become one of the best known introductions to the principles, techniques and applications of optical holography.
Fienup environmental research institute of michigan radar and optics division p. A novel approach is described for the holographic elements used in the. Holographic optical elements hoes recorded with arbitrary aspheric wavefronts can now be analyzed with a holographic ray tracing design program. Holographic optical element has a high diffraction efficiency and a narrowband frequency characteristic, and it has a characteristic that is able to implement several features in a single flat device. Online access to spie ebooks is limited to subscribing institutions. The hoe blu consists of two reflection type hoes that change the optical beam path and shape by diffraction. Holographic photopolymers are a new technology to create passive diffractive optical elements by a pure laser interference recording. Testing of holographic optical elements for holographic. It is pointed out that hoe development based on the use of squeezed light, speckle, nonlinear recording, comparative studies between optics and communication.
The development of this technology will encourage the conversion of bulky refractive optical systems into highly compact, lightweight diffractive optical systems. This 1996 book is a greatly expanded edition of what has become one of the best known introductions to the principles. Recent developments in holographic optical elements. Evaluation of volume holographic optical elements in dichromated gelatin the use of dichromated gelatin dcg for the formation of holographic optical elements is investigated. The authors have designed and fabricated a compact. In this chapter, the principle and characteristics of the holographic optical elements are described in detail, and few typical holographic optical. The hoe blu consists of two reflection type hoes that change the. Holographic optical elements holographic optical elements 19751001 00. Holographic optical elements for holographic stereogram printers. Computeroriginated planar holographic optical elements silviu reinhorn, yaakov amitai, and albert a. Since four years the ilb is developing lightdirecting building components, using holographic optical elements hoe. The content of this chapter is focused on holographic optical elements hoes, which are diffractive elements fabricated by recording the interference pattern of an object and a reference wave in a photosensitive emulsion. I describe its historical development, its basic principles and some examples of its practical application.
Monolithic and integral holographic optical element recording configurations are defined and experimental systems are demonstrated, with emphasis on scalability, ease of manufacture, illumination format, and diffusion property manipulations. Besides refractive and reflective components, planar diffractive optical elements are promising for free space optical interconnects. Luminit holographic technologies for neartoeye or headup displays use thin 1030 micron holographic photopolymer film. Holographic optical elements as scanning lidar telescopes. It guides students from simple optics to advanced topics in holography, following a. The recording of each planar holographic element is done.
The elements are recorded with complex wavefronts that are derived recursively from. The rsoft bsdf file is then used in lighttools to define a surface property rays that hit the surface in lighttools are diffracted according to the data in the rsoft. The illumination area of backlight is 150 mm x 90 mm and the thickness is 10 mm. Metasurface holograms for holographic imaging weiwei wan, jie gao, and xiaodong yang doi. Holographic optical elements for the extremeultraviolet regime. Advances in led technology continue to bring new opportunities for commercial and residential lighting, as well as innovations in digital displays. Design and fabrication of diffractive optical elements. A holographic optical element hoe is an optical element that is produced using holographic. You can implement a wide range of applications with minimal light loss examples of diffractive microoptics. Pdf holographic optical elements in dichromated gelatin. I describe its historical development, its basic principles and some examples of its practical application in optical systems. Among holographic concentrators, volume holographic optical elements vhoes have been proposed for use as solar concentrators. Design of diffractive optical elements for augmentedvirtual. I holographic optical elements as scanning lidar telescopes.
Diffractive lenses and holographic optical elements hoes. Application of holographic optical elements in buildings for various. Luminit transparent holographic components thcs are creating new opportunities for ar smart glasses, headmounted, vehicular and avionics headup displays. Evaluation of volume holographic optical elements in. For the love of physics walter lewin may 16, 2011 duration. Design of diffractive optical elements for augmented. We have investigated and developed the use of holographic optical elements hoe and holographic transmission gratings for scanning lidar telescopes. Curved holographic optical elements and applications.
Compared with conventional refractive and reflective optics, vhoes can be thinner and more lightweight and have the potential for being very inexpensive in mass production. Dichromated gelatin and photoresists are among the holographic recording materials used in forming holographic optical elements. Volume holographic optical elements as solar concentrators. Pdf holographic optical elements and application researchgate. A holographic optical element hoe is an optical element such as a lens, filter, beam splitter, or diffraction grating that is produced using holographic imaging processes or principles. A novel approach is described for the holographic elements used in the holographic sight, in which the parameters are defined and measured as per their intended final application. Lightweight and highly efficient, the components use holographic optical elements to direct light without the need for bulky conventional optics. The development and construction of a production process to manufacture holographic optical elements in dichromated gelatin for headup displays requires that a tight control over the spectral. Holographic optical elements holographic optical elements basler, dieter 19890331 00. Optical holography is a method for storage and displaying a threedimensional image of an object.
The hoe layers are almost free from diffraction unlike spatial light modulator layers, which makes this additive light field display. Special issue on holographic optical elements hoes special issue on holographic optical elements hoes. The rsoft bsdf file is then used in lighttools to define a surface property. Popular summary holographic optical elements as scanning lidar telescopes geary k. Friesem we present novel, to our knowledge, methods for the analytical design and recording of planar holographic optical elements in thick materials. This paper discusses the distinctive features of holographic optical elements. By rotating a flat hoe in its own plane with the focal spot on the rotation axis, a very simple and compact conical scanning telescope is possible. Holographic optical elements hoes for building applications are light guiding elements consisting of a holographic film laminated between two sheets of glass. Compared with conventional refractive and reflective optics, vhoes. One use of a holographic optical element is in thinprofile combiner lenses for optical headmounted displays. A practical seethrough head mounted display using a.
Holographic optical elements, proceedings of spie 10. Pdf fullcolor holographic optical elements for augmented. Curved holographic optical elements and applications for. Transparent holographic optical elements for display. Holographic optical elements hoes virtuallab fusion provides a complete workflow for diffractivelens and hoe design. Oct 23, 2012 for the love of physics walter lewin may 16, 2011 duration. Cambridge core electromagnetics optical holography by p. Our hoe products includes, holographic reticles holographic transmission grating holographic reflection grating holographic lens holographic diffuser holographic photonic crystal holographic. Holographic optical elements optical elements such as lenses, beam splitters, diffraction gratings and filters can be produced by holographic imaging. Pdf curved holographic optical elements and applications. In particular, a study is made of the possible sources of spurious recording and replay in such diffracting media. The efficiency of the fullcolor hoes for a onelayer structure, b threelayer structure, and c twolayer.
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