Bayfol HX photopolymer for full-color transmission volume Bragg gratings

Manipulating light with optical gratings based on volume Holographic Optical Elements (vHOEs), also known as volume Bragg gratings, has the advantage to reconstruct only the first diffraction order and hence provide high diffraction efficiencies and angular selectivity. In addition, they offer the further benefit to be fully transparent in the off- Bragg condition like it is required in optical combiners. We present the latest status of our instant-developing photopolymer film technology (Bayfol® HX) and show beneficial recording parameters - specifically we discuss the challenges to record transmission vHOEs and how to overcome them. Experimental results on color transmission recordings are shown and it is demonstrated that those match perfectly to Kogelniks coupled wave theory. It is recommended to adopt the dynamic range of the recording media by proper choice of recording dosage, recording power, beam ratio and photopolymer film type to the desired transmission vHOE design.

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