Dispersive concentrating systems based on transmission phase holograms for solar applications

Bloss, W. H.; Griesinger, M.; Reinhardt, E. R.

doi:10.1364/ao.21.003739

Cited by 62 publications

(39 citation statements)

References 5 publications

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“…They can function as gratings, lenses, beam splitters, spectral filters, shear elements, achromats, mirrors, birefringent elements, and multi-function elements. They can be used, for example, in optical sensors [1][2][3][4][5][6][7], fibre-optics [8][9][10][11], optical scanners [12][13][14], optical disk pick-up heads [15][16] as well as holographic concentrators [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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A holographic device is under development that aims to improve light collection in solar cells. The aim is to explore the potential of using photopolymer Holographic Optical Elements (HOE) to collect light from a moving source, such as the sun, and re-direct it for concentration by a holographic lens.. A working range of 45 degrees is targeted for such a device to be useful in solar applications without tracking. A photopolymer HOE is capable of efficiently re-directing light, but the angular selectivity of a single grating is usually of the order of one degree at the thicknesses required for high efficiency. The challenge here is to increase the angular and wavelength range of the gratings so that a reasonable number may be multiplexed and/or combined to provide a device that can concentrate light incident from a large range of angles. In this paper low spatial frequency holographic recording is explored in order to increase the angular and wavelength range of an individual grating. Ultimately, a combination of gratings will be used so that a broad range of angles of incidence are accepted. A design is proposed for the combination of such elements into a holographic solar collector. The first step in achieving this is optimization of recording at low spatial frequency. This requires a photopolymer material with unique properties, such as a fast monomer diffusion rate. This paper reports results on the efficiency of holograms recorded in an acrylamide based photopolymer at low spatial frequencies (100, 200 and 300 l/mm). The diffraction efficiency and angular selectivity of recorded holograms have been studied for various photopolymer layer thicknesses and different intensities of the recording beams. A diffraction efficiency of over 80% was achieved at a spatial frequency of 200 l/mm. The optimum intensity of recording at this spatial frequency was found to be 1 mW/cm 2 . Individual gratings and focusing elements with high efficiency and FWHM angles of 3 o are experimentally demonstrated.

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Section: Introductionmentioning

confidence: 99%

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Akbari¹,

Naydenova²,

Martin³

2014

Appl. Opt.

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“…The energy of the solar spectrum which is associated with these wavelengths overheats the cells and thus their efficiency decreases. The hologram can be designed to be efficient at the spectral range in which the PV cells achieve their maximum sensitivity, which leads to an improvement of cells efficiency as well as to the elongation of their lifespan [5,6]. For the rest of the spectrum, the holographic element is transparent.…”

Section: Introductionmentioning

confidence: 99%

Holographic lenses for building integrated concentrating photovoltaics

et al. 2013

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“…In this paper we study diffraction gratings as an alternative method for coupling sunlight into a light guide [5,6]. Diffraction gratings are compact and relatively inexpensive to make.…”

Section: Introductionmentioning

confidence: 99%

Surface-relief and polarization gratings for solar concentrators

2011

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Transmission gratings that combine a large diffraction angle with a high diffraction efficiency and a low angular and wavelength dispersion could be used to collect sunlight in a light guide. In this paper we compare the diffractive properties of polarization gratings and classical surface-relief gratings and explore their possible use in solar concentrators. It is found that polarization gratings and surface-relief gratings have qualitatively comparable diffraction characteristics when their thickness parameters are within the same regime. Relatively large grating periods result in high diffraction efficiencies over a wide range of incident angles. For small grating periods the efficiency and the angular acceptance are decreased. Surface-relief gratings are preferred over polarization gratings as in-couplers for solar concentrators.

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Dispersive concentrating systems based on transmission phase holograms for solar applications

Cited by 62 publications

References 5 publications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Using acrylamide-based photopolymers for fabrication of holographic optical elements in solar energy applications

Holographic lenses for building integrated concentrating photovoltaics

Surface-relief and polarization gratings for solar concentrators

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