We analyzed a number of optical media, such as GGG, Nd:YAG, Yb:YAG, fused silica, ${\mathrm{CaF}}_2$ , $\mathrm{Yb}\text{:}{\mathrm{CaF}}_2$ , and CdMnTe, that have not been used, to our knowledge, in the cryogenic Faraday isolator (FI) before. The temperature dependence of the Verdet constant and thermo-optical constants was experimentally investigated for $\lambda =1.07\mathrm{\mu m}$ . We calculated the magneto-optical figure-of-merit and assessed the feasibility of using FI media with multikilowatt average laser power.

© 2011 Optical Society of America

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