Microwave Modulation of Light in Ferromagnetic Resonance

Direct spectroscopic evidence has been obtained of microwave sidebands imposed on a monochromatic light beam by transmission through a single crystal of chromium tribromide at ferromagnetic resonance. Microwave frequencies above 13.5 Gc/sec may be used, and the most favorable optical wavelengths for this effect lie between 4750 and 5000 A. This work has demonstrated modulation of a 4810‐A beam by a 23.5‐Gc/sec microwave signal. This paper discusses the conditions under which the modulation may be observed, and how some of these may be optimized.Direct spectroscopic evidence has been obtained of microwave sidebands imposed on a monochromatic light beam by transmission through a single crystal of chromium tribromide at ferromagnetic resonance. Microwave frequencies above 13.5 Gc/sec may be used, and the most favorable optical wavelengths for this effect lie between 4750 and 5000 A. This work has demonstrated modulation of a 4810‐A beam by a 23.5‐Gc/sec microwave signal. This paper discusses the conditions under which the modulation may be observed, and how some of these may be optimized.