Measurement of refractive index of photopolymer for holographic gratings

Eriko Watanabe; Jun Mizuno; Chiemi Fujikawa; Kashiko Kodate

doi:10.1117/12.714392

20 February 2007 Measurement of refractive index of photopolymer for holographic gratings

Eriko Watanabe, Jun Mizuno, Chiemi Fujikawa, Kashiko Kodate

Author Affiliations +

Proceedings Volume 6488, Practical Holography XXI: Materials and Applications; 64880A (2007) https://doi.org/10.1117/12.714392
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We have made attempts to measure directly the small-scale variation of optical path lengths in photopolymer samples. For those with uniform thickness, the measured quantity is supposed to be proportional to the refractive index of the photopolymer. The system is based on a Mach-Zehnder interferometer using phase-locking technique and measures the change in optical path length during the sample is scanned across the optical axis. The spatial resolution is estimated to be 2&mgr;m, which is limited by the sample thickness. The path length resolution is estimated to be 6nm, which corresponds to the change in refractive index less than 10^-3 for the sample of 10&mgr;m thick. The measurement results showed clearly that the refractive index of photopolymer is not simply proportional to the exposure energy, contrary to the conventional photosensitive materials such as silver halide emulsion and dichromated gelatine. They also revealed the refractive index fluctuation in uniformly exposed photopolymer sample, which explains the milky appearance that sometimes observed in thick samples.

Citation Download Citation

Eriko Watanabe, Jun Mizuno, Chiemi Fujikawa, and Kashiko Kodate "Measurement of refractive index of photopolymer for holographic gratings", Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880A (20 February 2007); https://doi.org/10.1117/12.714392

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