Infrared Intensity Modulation using Long Wavelength Magnetostatic Modes of YIG at Microwave Frequencies

Surface and volume magnetostatic mode resonances of an axially magnetized YIG rod is used for the diffraction and intensity modulation of 1,15μ He-Ne laser beam. YIG crystal is excited with a dielectric microwave resonator at S band. Amplitude modulation of the microwave source produces intensity modulation on the diffracted laser beam. Critical Bragg angles are not needed and the first order diffracted beams are found symmetric about the zero order.