Circular dichroism in magnesium sulfite hexahydrate doped with cobalt

Zh. Bunzarov; I. Iliev; T. Dimov; P. Petkova; Tz. Kovachev; L. Lyutov; Y. Tzoukrovski

doi:10.1117/12.849198

11 November 2009 Circular dichroism in magnesium sulfite hexahydrate doped with cobalt

Zh. Bunzarov, I. Iliev, T. Dimov, P. Petkova, Tz. Kovachev, L. Lyutov, Y. Tzoukrovski

Proceedings Volume 7501, International Conference on Ultrafast and Nonlinear Optics 2009; 75010X (2009) https://doi.org/10.1117/12.849198
Event: Ultrafast Nonlinear Optics 2009, 2009, Bourgas, Bulgaria

Abstract

The new nonlinear crystal of magnesium sulfite hexahydrate (MgSO₃.6H₂O) belongs to the rare crystallographic class C₃ (without a symmetry centre), the other known only representative being sodium periodate (NaIO₄). There are some scarce data in the scientific papers about magnesium sulfite hexahydrate's physical properties. Single crystals of significant sizes (up to 40-50 mm) of MgSO₃.6H₂O as well as such, doped with Ni, Co, and Zn, for the time being are grown only by our own method developed in the Laboratory for Crystal growth at the Faculty of Physics of Sofia University. Recently we have observed the supposed presence of optical activity. Circular dichroism is not observed in pure MgSO₃.6H₂O. The results of the first ever investigations are presented, which demonstrate the presence of circular dichroism in MgSO₃.6H₂O doped with Co. The circular dichroism appears in the spectral range from 420 nm to 580 nm. The spectrum of circular dichroism demonstrates a well expressed structure - an isolated maximum at 470 nm and a combination of two overlapped maxima at ~ 495 nm and 520 nm respectively. The spectrum of the circular dichroism is compared with the absorption spectrum of MgSO₃.6H₂O:Co, along the direction (0001) and with the linear dichroism spectrum measured in direction(1210). It is shown in this way that the circular dichroism appears only in the spectral range of the optical absorption structure due to Co dopant. In the same spectral range can be observed also the linear dichroism determined by Co presence in MgSO₃.6H₂O.

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Zh. Bunzarov, I. Iliev, T. Dimov, P. Petkova, Tz. Kovachev, L. Lyutov, and Y. Tzoukrovski "Circular dichroism in magnesium sulfite hexahydrate doped with cobalt", Proc. SPIE 7501, International Conference on Ultrafast and Nonlinear Optics 2009, 75010X (11 November 2009); https://doi.org/10.1117/12.849198

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KEYWORDS

Dichroic materials

Crystals

Absorption

Cobalt

Nonlinear crystals

Magnesium

Optical activity

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