Abstract
Impurity effects on the optical properties of bithmus-substituted iron garnet films grown by liquid phase epitaxy have been investigated. Growth temperature dependences of optical absorption coefficient at 0.56 μm and Faraday rotation coefficient at 1.15 μm are presented for (YbPrBi) 3Fe5O12 and (TmNdBi)3(FeGa)5O12 single crystal films with in-plane magnetization. With decreasing the growth temperature, the absorption and Faraday rotation coefficients increase with the incorporation of Bi and Pb ions. In the Raman scattering spectra, intensity enhancement of the impurity-induced phonon lines is found at 450 and 700 cm-1. To examine the guided-wave optical properties, a “m-line” spectrometer equipped with a CCD image sensor has been used. Guided-wave properties such as refractive index, absorption coefficient, and TE-TM mode conversion efficiency at 1.15 μm are discussed for (YbPrBi)3Fe5O12 films.
