Virtual display design using waveguide hologram in conical mounting configuration

Holograms recorded in dichromated gelatin (DCG) are usually sealed with a glass plate cemented with an epoxy glue to protect the holograms from moisture in the environment. An investigation of the wavelength properties of sealed DCG holograms had been carried out paying attention to holograms which were exposed to different temperature and humidity environment in this work. The investigation had revealed that (a) exposing the sealed DCG holograms to high relative humidity (RH=98%) environment or immersing them in room-temperature water for 20 hours can not affect the holograms; (b) the sealed DCG holograms can be used at temperature below 50℃ without showing undue detrimental effects regarding their optical properties; (c) the peak wavelength of sealed DCG holograms can cause blue shift of several nanometers at 70℃～85℃ and the velocity of blue shift is proportional to the environmental temperature; (d) the holograms can be destroyed at 100℃ or above. The experimental results above will be analyzed and discussed in this paper. A method to improve the stability of sealed DCG holograms is proposed: baking the sealed DCG holograms at proper temperature (e.g., 85℃ in this study).

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“…In the low temperature experiment, two representative hologram samples (NO 8,9) were placed in the baking chamber …”

Section: Low Temperaturementioning

confidence: 99%

“…The application of this method to HOEs, which is made by DCG, used in image display, interferometry and optical interconnects can be expected to increase their environmental stability. [9] 2. EXPERIMENT…”

Section: Introductionmentioning

confidence: 99%

Wavelength properties of DCG holograms under the conditions of different temperature and humidity

Liu

Ding

et al. 2014

International Symposium on Optoelectronic Technology and Application 2014: Laser Materials Processing; And Micro/Nano Technolog

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“…When radiation reaches DG, part of it is diffracted into "+1" and the opposite «-1» orders. "0" order of the radiation spreads within the substrate [1][2][3][4][5].…”

Section: Combined Diffractive Optical Element Schemementioning

confidence: 99%

“…When radiation reaches DG, part of it is diffracted into "+1" and the opposite «-1» orders. "0" order of the radiation spreads within the substrate [1][2][3][4][5].A typical scheme of a holographic display are considered and modified. The main component of such system is a signs-symbolic information output device.…”

mentioning

confidence: 99%

Design and experiments of combined diffractive optical element for virtual displays and indicators

et al. 2015

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Combined diffractive optical elements, which perform the functions of deflection, focusing or transformation of wave fronts and together with the spectral-angular selection of the incident polychromatic radiation, obtained on a single substrate, the method of their design and fabrication are described. The combination of four-level diffraction grating with plasmon meander diffraction grating as a spectral filter that have a bandwidth that varies with the angle of incidence are investigated for use in virtual displays and indicators.Keywords: combined diffractive optical element, multi-level diffraction grating, spectral plasmon filter, holographic indicator, diffraction efficiency, spectral and angular selectivity, metallic meander. INTRODUCTIONCurrently, diffractive optical elements (DOEs) with light guide substrates are used in miniature display systems where the required sign-symbol information is superimposed on real imagery. The weight and size of display and visualization systems can be significantly reduced by the use of these elements. To display multicolored images DOEs should be developed with adjustable angular and spectral selectivity. The design of a new type of combined DOEs with increased diffraction efficiency and spectral-angular selectivity will promotes to development of a new generation of signs-symbolic information displays, based on diffractive optical elements and light guide substrates. In this case conventional DOEs such as diffraction gratings (DGs), Fresnel lenses, etc., perform the wave fronts transform function as well as holographic mirrors, plasmon diffraction gratings (PDGs) and color holograms may be used as spectralangular filters. It should be noted that to enable of combined DOE replication its must be relief-phase DOE. COMBINED DIFFRACTIVE OPTICAL ELEMENT SCHEMEOptical indicator includes OLED-display, the collimating lens and the substrate with the DG. When radiation reaches DG, part of it is diffracted into "+1" and the opposite «-1» orders. "0" order of the radiation spreads within the substrate [1][2][3][4][5].A typical scheme of a holographic display are considered and modified. The main component of such system is a signs-symbolic information output device. These devices include a glass substrate, in which radiation can propagate with total internal reflection, and DGs for the output of radiation. But in this case the combined DOE is used instead of gratings. Combined DOE, as shown in Figure 1, is a two-element and consists of a multi-level grating (DG) and spectral filter.A combination of four-level diffraction grating (DG) having high diffraction efficiency with spectral filters that have a bandwidth that varies with the angle of incidence inside a single DOE [8] is shown in Fig. 1. To ensure high diffraction efficiency multi-level structure of DG relief is required. The use of plasmonic effects in metal-dielectric thin films [6-7] enables the creation of spectral filters with adjustable bandwidth by changing the angle of incidence of input light. The rectangular metal ...

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“…HOE-DOEs with light guide substrates are used in miniature display systems [1][2][3][4][5][6]. With these combined elements, the weight and size of display and visualization systems can be significantly reduced [3,4], which allows for their use in new applications, especially in automotive and aviation systems [2,4,5], where the display is superimposed on real world imagery.…”

Section: Introductionmentioning

confidence: 99%

Combined holographic optical elements for multicolor holographic screens and indicators

Odinikov

Kuznetsov

Kolyuchkin

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. A combination of holographic and diffractive optical elements (HOE-DOEs) for multicolor signs-symbolic information display system, screens and indicators is described. These elements combine the functions of high-efficiency four-level diffractive optical elements with spectral plasmon filters having a variable bandwidth dependent on the angle of incidence. The main parameters of such HOE-DOEs were determined using the Fourier modes method. The theoretical results show that a four-level diffraction grating and a plasmon filter can be combined based on their spectral-angular characteristics, opening up the possibility for their use in display systems. IntroductionCurrently, one of the most promising practical applications of flat optics is the development of holographic and diffractive optical elements (HOE-DOEs) with binary and multi-level surface relief, as well as their integration into optical devices. HOE-DOEs with light guide substrates are used in miniature display systems [1][2][3][4][5][6]. With these combined elements, the weight and size of display and visualization systems can be significantly reduced [3,4], which allows for their use in new applications, especially in automotive and aviation systems [2,4,5], where the display is superimposed on real world imagery.The use of holographic indicators in different climatic conditions requires the selection of special photosensitive materials for HOE-DOEs. These elements may need to be physically protected or recorded directly into the glass [4]. There is a significant problem with the low diffraction efficiency of these devices [1][2][3]. Improved efficiency would allow for the use of less powerful illumination source including the possibility of using OLED-displays. In order to project multi-colored images, HOE-DOEs need to be designed with the specified spectral and angular selectivity. The development of a new type of combined HOE-DOEs with increased diffraction efficiency and spectral-angular selectivity for different photosensitive materials and glass will facilitate the development of a new generation of signs-symbolic information displays, based on holographic optical elements and light guide substrates.

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Virtual display design using waveguide hologram in conical mounting configuration

Cited by 19 publications

References 11 publications

Wavelength properties of DCG holograms under the conditions of different temperature and humidity

Wavelength properties of DCG holograms under the conditions of different temperature and humidity

Design and experiments of combined diffractive optical element for virtual displays and indicators

Combined holographic optical elements for multicolor holographic screens and indicators

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