Holographic storage of information in EuO films

An investigation was made of the use of thin EuO films as a medium for reversible optical storage of information. Very simple holograms, as well as images of a transparency containing 10³ elements, were stored and reconstructed. The energy density of light pulses used in thermomagnetic recording was 5×10^–5–5×10^–6 J/mm². Reconstruction (reading), performed with an He–Ne laser (λ = 0.63 μ), was characterized by an efficiency of 10^–4 and the maximum spatial frequency exceeded 500 mm^–1. An analysis was made of the possibility of improving the diffraction efficiency of reconstruction by means of radiation of 1150 nm wavelength.