Refractometry of mechanically compressed (NH4)2SO4 crystals

Stadnyk, V.; Romanyuk, N.; Tuzyak, M.; Brezvin, R.; Matviishin, I.; Gaba, V.
June 2008
Optics & Spectroscopy;Jun2008, Vol. 104 Issue 6, p870
Academic Journal
The effect of uniaxial mechanical pressure σ m ≤ 150 bar on the spectral (300–800 nm) dependence of the birefringerence Δ n i and refractive indices n i of (NH4)2SO4 crystals has been investigated. It is shown that the dispersion of n i ( λ) and Δ n i ( λ) is normal and sharply increases with approach to the absorption edge. It is established that uniaxial pressure does not change the character of the dispersions dn i / dλ and dΔ n i / dλ and only affects their magnitudes. It is shown that the increase in the refractive indices under uniaxial stress is mainly due to the increase in the refraction caused by the increase in the band gap and long-wavelength shift of the UV absorption band maximum.


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