High power laser systems operating at mid IR wavelengths are required for medical applications, environmental monitoring, and military applications. All of these systems require optical isolators to avoid feedback into the pump laser cavity. We present measurements of the Verdet coefficient of germanate glass with Dy concentrations varying from 20-50% at wavelengths between .4 and 1.5 microns. The results indicate a linear increase of the Verdet coefficient with impurity concentration and a Sellmeier like dependence on wavelength.

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David E. Zelmon, William Poston, John D. Kunkel, Masoud Mollaee, Michael Li, Jie Zong, Arturo Chavez, and Xiushan Zhu, "Spectral and concentration dependence of the Verdet coefficient of dysprosium doped germanate glass," Proc. SPIE 10899, Components and Packaging for Laser Systems V, 1089910 (Presented at SPIE LASE: February 06, 2019; Published: 4 March 2019); https://doi.org/10.1117/12.2506615.