TUNABLE OPTICAL FILTER, BASED ON LIQUID CRYSTAL CELL Russian patent published in 2019 - IPC G02F1/01 

FIELD: physics.

SUBSTANCE: invention relates to devices and methods for implementing and controlling optical wavelength filtering. Tunable optical filter contains a light source, a polarizer, an input optical element, a liquid crystal cell, an output optical element, a control unit. Input optical element, the liquid crystal cell and the output optical element are inclined with respect to the incident optical radiation from the light source at an angle, providing full internal reflection for the wavelength range of the incident optical radiation inside the input optical element from the interface of the input optical element and the liquid crystal cell, when the specified voltage is not supplied to the liquid crystal cell, and the passage of the working part of the wavelength range of optical radiation through the liquid crystal cell and the output optical element, and the total internal reflection of the remaining part of the wavelength range of optical radiation inside the input optical element from the interface between the input optical element and the liquid crystal cell, when the specified voltage is applied to the liquid crystal cell.

EFFECT: invention provides a reduction in the size of the device and energy consumption.

21 cl, 5 dwg