Study of the influence of Tb-Sc-Al garnet crystal composition on Verdet constant

• Published in: Optical materials 2017-04, Vol.66, p.106-109
• Main Authors: Ivanov, I.A., Karimov, D.N., Snetkov, I.L., Palashov, O.V., Kochurikhin, V.V., Masalov, A.V., Fedorov, V.A., Ksenofontov, D.A., Kabalov, Y.K.
• Format: Article
• Language: English
• Subjects: Magneto-optical material; Single crystal; Terbium scandium aluminum garnet; Verdet constant
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2017.01.045

The influence of the composition of Tb-Sc-Al garnet crystals (TSAG) on the value of Verdet constant was investigated at the wavelengths of 400–1060 nm. It was found that this value increased both, with the decrease of Sc3+ ions content and with the decrease of lattice parameter. The value of Verdet constant of TSAG crystals depend on lattice parameter value and increased from 0.168 to 0.198 min/(Oe cm) (at λ = 1064 nm) with the decrease of Sc3+ ions content from 1.76 to 1.3 f.u. The value of Verdet constant for TSAG crystals with Sc3+ ions content of 1.3 f.u. can be described using one- and two-oscillator models with the same accuracy. The absorption at the wavelengths of 226 and 272 nm for the sample with a thickness of 13 μm was observed and wavelengths were used for calculations of Verdet constant in accordance with the two-oscillator model. •The influence of composition of TSAG crystals on Verdet constant was investigated.•Two intensive absorption lines at 0.226 and 0.272 μm were found.•Good correlation between the two- and the one-oscillator models was observed.•Verdet constant increased with the decrease of the amount of Sc ions.