SINGLE CRYSTAL, METHOD FOR PRODUCING SAME, OPTICAL INSULATOR AND OPTICAL PROCESSOR USING SAME Russian patent published in 2014 - IPC C30B29/28 C30B15/04 G02F1/09 

FIELD: physics, optics.

SUBSTANCE: invention relates to the technology of producing a terbium aluminium garnet single crystal which can be used as a polarisation rotator (Faraday rotator) in optics. The single crystal is a terbium aluminium garnet single crystal in which part of the aluminium is replaced with lutetium (Lu) and which has the following chemical formula: $$(T{b}_{a-y}{L}_y)(M_{b-x}{N}_x)A{l}_{3-z}{O}_{12}(1)$$ , wherein L represents Sc, M represents at least one type of element selected from a group consisting of Sc and Y, N contains Lu, and a, b, x, y and z satisfy the following formulae: 2.8≤a≤3.2; 1.8≤b≤2.2; 0.01≤x≤0.6; 0≤y≤0.5; and -0.5≤z≤0.5. The single crystal of said composition is capable of providing a larger Faraday rotation angle than a terbium gallium garnet (TGG) single crystal not only in the wavelength range of 1064 nm or more, but in the wavelength range smaller than 1064 nm, and is also capable of sufficiently inhibiting decrease in transmittance in the short wavelength region (400 to 700 nm) unlike TGG.

EFFECT: invention increases the size of obtained crystals.

10 cl, 9 dwg, 4 ex