METHOD OF DETERMINING MOLAR RATIO OF LiO IN LiNbO MONOCRYSTALS Russian patent published in 2014 - IPC H01L21/66 G01N21/17 C30B29/30 

FIELD: chemistry.

SUBSTANCE: method includes exposing a crystal to initial pulsed polarised non-monochromatic radiation in the short-wave infrared region to obtain initial pulsed polarised radiation in the short-wave infrared range and pulsed polarised radiation of a harmonic in the visible range, separating the pulsed polarised radiation of the harmonic in the visible range, conversion thereof into an electrical signal, obtaining a curve of amplitude of the electric signal versus the wavelength of the pulsed polarised monochromatic radiation of a second and overall harmonic, determining therefrom a 90-degree synchronism wavelength, from which the molar content of Li₂O in the LiNbO₃ monocrystal is determined. The LiNbO₃ monocrystal used is a monocrystal in the form of a plane-parallel plate with crystallographic axis Z located in the plane of the entrance face of the crystal, perpendicular to the axis of the optical system.

EFFECT: high accuracy of determining the molar ratio of Li₂O in a LiNbO₃ monocrystal at low values of the molar ratio of Li₂O and broader functional capabilities.

3 dwg