31 May 2017 Photopolymer film-based holographic optical element for modification of LED radiation pattern
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Abstract
We created a record of an optical field formed due to interference of a spherical divergent reference wave and signal plane wave in a self-developing photopolymer film using a He-Ne laser and Mach-Zehnder-like interferometric set-up. Due to Bragg reflections the recorded volume holographic grating acts as holographic lens and transforms the reference divergent wave onto a near-collimated one. After successful recording the diffraction efficiency of the lens is found to be 84% at Bragg angle. The lens is used to modify the radiation pattern of a commercially available red emitting LED. The effect of the holographic lens on the LED’s radiation pattern is investigated by far-field measurement of intensity pattern as function of angle for LED without the lens and with applied holographic lens.
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Norbert Tarjányi, Norbert Tarjányi, Ľuboš Šušlik, Ľuboš Šušlik, Daniel Káčik, Daniel Káčik, } "Photopolymer film-based holographic optical element for modification of LED radiation pattern", Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102331R (31 May 2017); doi: 10.1117/12.2265380; https://doi.org/10.1117/12.2265380
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