13 July 2000 Infrared beam control through acousto-magneto-optic interaction in α-Fe2O3
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Abstract
Rapid control of the parameters of infrared radiation, such as amplitude, phase and the direction of propagation, is important in a number of military and commercial applications. Some examples are radar and lidar beam modulation and steering, optical communications and information processing. The suitability of canted antiferromagnet hematite ((alpha) -Fe2O3) for such applications is discussed. Experimental results of optical transmission in the 1 - 5 micrometers spectral interval, magneto- induced birefringence, acousto-magneto-optic diffraction, and the magnetic field dependencies of diffraction angle and efficiency (at a wavelength of 1.55 micrometers ) are presented in this paper. The combination of magneto-optic properties, which potentially introduce large induced birefringence, and acoustics (periodic modulation of birefringence along the cross-section of the optical beam), demonstrates enhanced efficiency of acousto-optic diffraction. Furthermore, an additional degree of freedom, which is the magnetic field tuning of acoustic velocities, is introduced. Directions for future development are also discussed.
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Aramais A. Avakian, Aramais A. Avakian, Paul I. Shnitser, Paul I. Shnitser, } "Infrared beam control through acousto-magneto-optic interaction in α-Fe2O3", Proc. SPIE 4046, Advances in Optical Information Processing IX, (13 July 2000); doi: 10.1117/12.391952; https://doi.org/10.1117/12.391952
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