FARADAY-ROTATION OF HOYA FR5 GLASS AT CRYOGENIC TEMPERATURE

Faraday rotation and magnetization in Hoya FR5 glass is investigated i n a magnetic field up to 80 kG under cryogenic temperature between 4.2 K and 10 K at the wavelength of 514.5 nm. For H/T>10 kG K-1, the satu ration is observed both in magnetization and in Faraday rotation and i s interpreted by using the quantum theory of paramagnetism about the d oped Tb3+ active ion. It is found that the temperature dependence of t he Verdet constant is correlated with the magnetic susceptibility and the dispersion of the Verdet constant is due to the effective electric dipole transition of 4f(8)-->4f(7)5d(1) with the resonance wavelength of 213 nm. (C) 1996 American Institute of Physics.