Bi-SUBSTITUTED RARE EARTH IRON GARNET SINGLE CRYSTAL, METHOD FOR PRODUCING SAME AND OPTICAL DEVICE

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PROBLEM TO BE SOLVED : To provide a garnet single crystal which contains no lead while using a crucible made of platinum, is free from deterioration in quality and rich in mass-productivity, and has an insertion loss of ≤0.10 dB. SOLUTION : A Bi-substituted rare earth iron garnet single crystal has a composition represented by R3-xBixFe5-wAwO12 (wherein, R must contain Gd, and may optionally contain at least one rare earth element; A represents at least one element selected from a group consisting of Ga, Al, In, or the like; x is >0.7 and ≤1.5; and w is >0 and ≤1.5), does not contain Pb but contains Pt, and contains Mn or at least one element of the group II elements. When Mn or the at least one element of the group II elements is expressed as M, the concentration (atppm) of M in the Bi-substituted rare earth iron garnet single crystal is expressed as [M], and the concentration (atppm) of Pt is expressed as [Pt], and further, the relational expression Δ of [M] and [Pt] is represented as Δ=(0.8[M])-[Pt], the value of Δ is set to be within the range of -0.34 to 2.87 atppm. COPYRIGHT : (C)2012, JPO&INPIT