The Effect of Electron Spin Resonance on Optical Faraday Rotation of CaF₂ Crystals Doped with Eu²⁺. I. Detection of Electron Spin Resonance

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The electron spin resonance produces marked changes of optical Faraday rotation of CaF₂ crystals doped with Eu²⁺ ions. The positions of resonance lines determined by observing the Faraday rotation are in good agreements with the published data. This effect is especially useful for the study of saturation of spin systems by strong microwave field and for the study of forbidden transitions.