WORKING NODE OF THE PULSED TERAHERTZ RADIATION DETECTOR Russian patent published in 2022 - IPC G02F1/03 

FIELD: measuring technology.

SUBSTANCE: invention relates to devices for optical measurement of an alternating electric field of terahertz radiation and can be used as a basic structural unit in detectors of broadband pulsed terahertz radiation. The device contains an electro-optical crystal made in the form of a plate made of lithium niobate and transparent in the terahertz range, and a trapezoidal optical prism placed with its large base on the specified plate for introducing terahertz radiation into it, providing detection of terahertz radiation by changing the direction of the polarization vector of an optical femtosecond pulse under the action of the electric field of the detected pulse of terahertz radiation due to Pockels effect while providing Cherenkov synchronism conditions. An electro-optical crystal and a prism provide detection of a terahertz radiation pulse by changing the direction of the polarization vector created by a laser with a wavelength of 800-1550 nm of an optical femtosecond pulse with a duration of 70-100 fs. The crystal plate is made with the condition that its crystallographic axis [001] is oriented perpendicular to the polarization vector of the optical femtosecond pulse, and the crystallographic axis [100] is parallel to the polarization vector of the electric field of the detected terahertz radiation pulse, while the latter axis is oriented parallel or perpendicular to the polarization vector of the optical femtosecond pulse.

EFFECT: increase in performance characteristics while simplifying the optical scheme, expanding the range of acceptable sources of optical radiation.

2 cl, 4 dwg