FARADAY-ROTATION EFFECTS OF (HOYBBI)(3)FE5O12 SINGLE-CRYSTAL AND ITS APPLICATION TO WIDE-BAND AND TEMPERATURE-STABILIZED OPTICAL ISOLATORS

A new composition of Bi-substituted mixed rare-earth iron garnet, a (H oYbBi)(3)Fe5O12 bulk single crystal, for use as wideband and temperatu re-stabilized optical isolator is investigated. To our knowledge, this is the first time that we report tile new mixed rare-earth-bismuth-ir on garnet and its magneto-optical properties in tile near infrared reg ion. The value of the specific faraday rotation of the crystal Ho3-x-y YbyBixFe5O12 (x = 1.03, y = 1.12) is about -891 degrees/cm at lambda = 1.31 mu m and -767 degrees/cm at lambda = 1.55 mu m. The Faraday rota tion temperature and wavelength characteristics of HoYbBiIG are also d iscussed. The Faraday rotation temperature stability S = theta(F)(-1) (d theta(F)/dT) is 4.6 x 10(-4) (K-1) at 1.55 mu m wavelength in the 1 0 to 110 degrees C temperature range, which is smaller than that of YI G. The Faraday rotation wavelength coefficient (FWC) is only 0.048%. A wideband and temperature-stabilized optical isolator using HoYbBiIG c rystal as Faraday rotator has been developed, The isolator is optimize d at lambda(0) = 1.55 mu m and T-3 = 25 degrees C, the isolation is hi gher than 40 dB in the wavelength region from 1.52 to 1.58 mu m throug hout the temperature range from 0 to 50 degrees C.