Bi-substituted rare-earth iron garnet single crystal and its manufacturing method and an optical device

摘要

Does not contain lead by using the [challenge] platinum crucible, rich in mass production without any quality deterioration, the provision of garnet single crystals with IL of 0.10dB following [MEANS FOR SOLVING PROBLEMS] R _3-x Bi _x Fe _5- (R is a rare earth of one or more members selected from the group consisting of Tb, Y, Eu, Gd, Ho, Yb, Lu, Nd, Tm, La, Sm, Dy, Er, Ce, from Pr _w A _w O ₁₂ always includes an element Tb, A is Ga, Al, In, Sc, Co, Ni, Cr, V, Ti, Si, Ge, Mg, Zn, Nb, Ta, Sn, Zr, Hf, Pt, Rh, Te , Bi-substituted rare earth iron garnet having a composition represented by a one or more elements selected from the group consisting of Os, Ce, from Lu, x is 0.7 x ≦ 1.5, w in 0 w ≦ 1.5) by incorporating Pt and it does not contain Pb in the single crystal contains at least one element of the second group element Mn or more, M, Bi-substituted rare-earth iron garnet single element at least one second group element or Mn in the crystal, [M], expressed as [Pt] Pt concentration (atppm), a relational expression of Δ and [Pt] and [M] M concentration (atppm) Set to -7.23atppm 1.64atppm less than Δ was set to one of the numerical range of 0.91 ± 0.05 coefficient α when expressed as. None [Selection Figure]