1550 nm 자기광학 응용을 위한 고농도 Dy 3+ 이온이 함유된 알루미노보로실리케이트 유리의 제조 및 자기광학 특성 분석
Fabrication and Optical Characterization of Highly Dy 3+ -ion Incorporated Alumino-borosilicate Glasses for Magneto-optical Applications at 1550 nm
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초록
자기광학(magneto-optical, MO) 효과가 우수한 광학소재는 자기장센서, 광전류센서, 광 고립기(optical isolator), 그리고 광서큘레이터와 같은 다양한 응용 분야에서 활용될 수 있어 많은 관심을 받고 있다. 본 연구에서는 일반적인 유리용융법을 사용하여 Dy 3+ 이온이 고농도로 함유된 알루미노보로실리케이트(alumino-borosilicate, ABS) 광학유리를 제조하고, Dy 3+ 이온 농도에 따른 ABS-Dy 유리의 열 특성, 광 특성 및 자기광학 특성을 분석하였으며 1550 nm 파장 대역에서 유리의 MO 특성을 패러데이 회전각 측정을 통하여 분석하였다. 패러데이 회전 각은 유리의 Dy 3+ 이온 농도가 증가함에 따라 선형적으로 증가하는 것으로 나타났으며, 특히 Dy 2 O 3 함량이 30 mol%인 유리는 −6.86 rad/ (T·m) 가량의 높은 베르데 상수를 갖는 것으로 확인되었다. 또한 제조된 ABS-Dy 유리는 128 ℃ 이상의 우수한 열안정성(∆T= T x − T g )과 파장대역이 각각 490–710, 1390–1560, 1800–2400 nm일 때 70% 이상의 높은 광투과특성을 보여주었다. 이상의 높은 베르데 상수와 우수한 열안정성은 본 연구에서 제안한 ABS-Dy 유리가 1550 nm MO 소자용 광학소재로 사용 가능함을 시사한다.
Abstract
Magneto-optical (MO) materials have attracted much attention, since they can be utilized for various optical applications, such as magnetic fieldsensors, optical current sensors, optical isolators, and optical circulators. In this study, alumino-borosilicate (ABS) glasses with high concentrations of Dy 3+ ions were fabricated by a conventional melt-quenching technique, and the dependence of their thermal, optical, and magneto-optical properties on Dy 3+ -ion concentration was investigated. The MO property of the glasses was investigated by measurement of Faraday rotation at 1550 nm. The Faraday rotation angle increased linearly with the increase of Dy 3+ -ion concentration in the glasses. A very high Verdet constant of −6.86 rad/(T·m) was obtained for glass with a Dy 3+ -ion concentration of 30 mol%. In addition, the ABS-Dy glasses showed good thermal stability of greater than128 ℃ against crystallization, and high optical transmission of 70% in the visible to near-infrared windows of 480–720, 1390–1560, and 1800–2400nm. Due to the high Verdet constant and good thermal stability, the ABS-Dy glasses in this study could be candidate optical materials for MO device applications at 1550 nm.
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