LiNH4SO4: A new crystal with an isotropic point

Spectral dependences of the refractive and birefringence indices of α-LiNH 4 SO 4 crystals have been investigated. Curves n i (λ) are found to intersect, which indicates the existence of an isotropic point (Δ n y = 0) for this crystal; at room temperature, this point corresponds to wavelength λ 0 ≈...

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Bibliographic Details
Published in:Optics and spectroscopy 2012-09, Vol.113 (3), p.288-290
Main Authors: Stadnyk, V. I., Brezvin, R. S., Savchuk, P. V.
Format: Article
Language:English
Subjects:
Condensed-Matter Spectroscopy
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
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Summary:Spectral dependences of the refractive and birefringence indices of α-LiNH 4 SO 4 crystals have been investigated. Curves n i (λ) are found to intersect, which indicates the existence of an isotropic point (Δ n y = 0) for this crystal; at room temperature, this point corresponds to wavelength λ 0 ≈ 683 nm. The isotropic point is blue-shifted upon heating. Temperature measurements of the angle between the optical axes indicate that the optical-axis plane changes orientation when passing through the isotropic state. The results obtained give grounds to consider LiNH 4 SO 4 as a new crystal with an isotropic point.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X12090147