YIG磁光晶体的光学浮区法生长OA

Yttrium iron garnet(Y3Fe5O12,YIG)crystals possess exceptional magneto-optical properties,rendering pivotal for optical communication and photonic integration.Herein,YIG single crystals were grown via the optical floating zone method,and the influence of growth atmosphere on optical quality of YIG single crystal was systematically investigated.The results show that phase-pure garnet structures are successfully obtained under both air and different oxygen partial pressure atmospheres.Crucially,crystals grown under pure O2 atmosphere exhibit superior transmittance performance in the infrared band,and its transmittance is close to the theoretical value(～75％).This is primarily due to the higher oxygen partial pressure during the growth process,which effectively inhibits the valence change of Fe3+.Fe 2p X-ray photoelectron spectroscopy analysis further reveals that the relative content of Fe2+is as high as 62％(mole fraction)in grown crystals under air atmosphere,but the relative content of Fe2+is reduced to 9％(mole fraction)in grown crystals under pure O2 atmosphere,which directly confirms the effective inhibition of oxygen partial pressure on the valence change of Fe3+from the chemical state level,thus facilitating preparation of high-quality magneto-optical crystals.The magneto-optical performance test at 1 386 nm further confirms that the prepared YIG crystal has good magneto-optical modulation performance,and its Faraday rotation angle can reach 225(°)/cm.This study provides a feasible path for the preparation of high-quality iron-based garnet crystals,which is of great significance for promoting the development of corresponding magneto-optical crystal functional devices.