Sinusoidal holographic gratings recorded in photoresist exhibit strong phase retardation and can be used as low cost quarterwave plates. It was found that the two most important fabrication parameters are, in order of importance, the spatial frequency and the modulation depth. It is not possible to achieve a sufficient phase retardation into photoresist with a single grating showing no rotation of the incident polarization, but the cascade configuration shows the required phase retardation without diffracted orders and is a good candidate for the fabrication of high quality quarterwave plates.
Holographic rejection filters for eye protection against lasers can successfully be fabricated on DCG-coated glass substrates with excellent performances such as narrow spectral bandwidth, optical densities superior to 4.5 and low noise. However, to protect the eye against shocks a more resistant substrate must be used. Since polycarbonate shows good optical qualities, it appears to be a good substitute to glass. Nevertheless, ways must be found to improve the adhesion of DCG layers onto the hydrophobic material before obtaining the same performances as those shown by filters recorded on glass substrates.
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