Photopolymers for holographic recording. V. Self-processing systems with near infrared sensitivity

The recent development of laser diodes emitting in the far red or near infrared range and which exhibit coherence lengths exceeding a few centimetres has opened new perspectives in the field of holography. However, the availability of recording materials with sensitivity in this spectral region often stands in the way of the development of new concrete applications. In this respect, this paper deals with a photopolymer recording system which shows great promise. Various compositions were optimized in which holograms can be recorded from 647 to 854 nm. Depending on the recording wavelength used, their holographic sensitivity ranges from 0.5 to 2 cm2 J. Moreover, the self-processing character of these recording materials seems to be in favour of their use for industrial inspection by real-time holographic interferometry.

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