BI-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL, METHOD FOR PRODUCING SAME, AND OPTICAL DEVIC

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Provided is a Bi-substituted rare earth iron garnet single crystal, which has a composition represented by R3-xBixFe5-wAwO12 (R must contain Gd, and may optionally contain at least one rare earth element selected from a group consisting of Y, Eu, Gd, Ho, Yb, Lu, Nd, Tm, La, Sm, Dy, Er, Ce, and Pr; A represents at least one element selected from a group consisting of Ga, Al, In, Sc, Co, Ni, Cr, V, Ti, Si, Ge, Mg, Zn, Nb, Ta, Sn, Zr, Hf, Pt, Rh, Te, Os, Ce, and Lu; x is 0.7 < x ≤ 1.5; w is 0 < w ≤ 1.5), does not contain Pb but contains Pt, and contains Mn or at least one element M from the group II elements; when [M] represents concentration (atppm) of M in the aforementioned single crystal, [Pt] represents concentration (atppm) of Pt, and the relational expression Δ is represented as Δ = (α x [M]) - [Pt], then a coefficient α is set at a value within the numerical range of 0.815 ± 0.035, and Δ is set within the range of -0.40atppm to 3.18atppm. Thus, a garnet crystal not containing lead, and with an IL of not more than 0.10dB, is provided.