Magneto‐Optic Hologram
作者:
G. Fan,
K. Pennington,
J. H. Greiner,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 3
页码: 974-975
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1657805
出版商: AIP
数据来源: AIP
摘要:
In this paper the first experiment of thermomagnetic writing of a hologram on a thin film of EuO and the reconstruction of the hologram is reported. Writing of the hologram is achieved by using a giant pulsed ruby laser as a source for thermomagnetization. Erasing of the hologram is accomplished by a small applied magnetic field. The ruby laser is used because of its ability to provide the energy required for writing in a time that is short compared with the thermo‐relaxation time. A hologram with shallow angle (10 &mgr; resolution) was recorded and the reconstruction of the hologram was done using a He&sngbnd;Ne laser as a source. The formation of the hologram is based on the fact that the index of refraction of the material is a function of magnetization. Thus, the different state of magnetization induced by the laser pulse acts as a phase‐hologram for polarized light. Polarizing elements were used to observe the reconstructed images from the magnetic holograms. Results were also obtained for the diffraction intensity in the different orders of a simple thermo‐magnetic hologram. An analysis is presented to interpret the observed phenomena and gives the calculated efficiency that can be obtained under ideal conditions.
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