LINEAR BIREFRINGENCE IN Bi-SUBSTITUTED IRON GARNET CRYSTALS

Abstract

Linear birefringence of iron garnet bulk crystals were investigated at a wavelength A=1.151!m and at room temperature. In Bi-substituted iron garnet c!yst~ls, the linear birefringence was composed of the magnetic linear b~refnngence (MLB) and some met astable birefringence. The metastable buefringence was suppressed by annealing, and was attributed to the growth-mduced. birefringence. The notable growth-induced birefringence was not observed In Bi-free iron garnet crystals. These results indicate that Bi ion plays an. impo!ta~t role to induce large growth-in~uced birefringence. Effect of the BI-substltutlOn on the MLB effect was also lOvestigated. The anisotropy parameter of the MLB effect increased with amount of Bi.

Magnetic field sensors using Ce:YIG single crystals as a Faraday element

“…In the case of as-grown Bi:YIG LPE films, two peaks of caused by their large uniaxial birefringence were observed [6]. And it is considered that the four clear peaks of in Ce:YIG samples as shown in Fig.…”

“…In these measurements, the LBM were obtained from the extinction ratio of the transmitted light or by using a Babinet-Soleil compensator. After the analysis using an optical indicatrix of the magnetized crystal, these measurement results for a cubic system as Ce:YIG crystals are described well by following equations [5], [6], (1) where and are the magnitude and anisotropy parameters of the LMB, respectively. is the angle between the direction of the magnetic field and the axis in the (011) in Fig.…”