Broadband terahertz source radiant power calibration device and method

Abstract

The invention provides a broadband terahertz source radiant power calibration device and method. A terahertz source capable of being tested is a terahertz source with a light beam divergence angle larger than 1.732 degree and the spectral region ranging from 30 micrometer to 3000 micrometer. According to the broadband terahertz source radiant power calibration device and method, the measurement method that radiation parameters of a standard terahertz source are compared with radiation parameters of the to-be-tested terahertz source is adopted; after radiation of the standard terahertz source or the to-be-tested terahertz source enters a low temperature vacuum background channel through a terahertz transmission window, the radiation and background radiation of a liquid nitrogen refrigeration black body are alternatively modulated through a light chopper sheet into periodically-changed terahertz radiation signals, are gathered through a Cassegrain system, income a terahertz detector through a terahertz spectrum light filter, are converted into periodically-changed voltage signals, and are processed through a lock-in amplifier to obtain stable measuring voltage signals. The radiant power of the to-be-tested terahertz source is obtained through calculation according to the radiant power correction factors obtained by measuring a weak radiation source or a strong radiation source, and meanwhile the radiation luminance of the to-be-tested terahertz source can be obtained through calculation.

Description

technical field [0001] The invention belongs to the technical field of optical metrology, and mainly relates to a terahertz source radiation power calibration device, in particular to a broadband terahertz source radiation power calibration device and a calibration method. Background technique [0002] In recent years, terahertz technology has been a cross-cutting cutting-edge high-tech that has been researched at home and abroad, and has great application prospects in fields such as security inspection, anti-terrorism, deep space exploration, terminal communication, medicine, and material detection. Among them, the development technology of terahertz radiation source is included in the national key basic research plan. Accurate measurement of the radiation power of terahertz sources has become a key problem restricting the development, production and application of terahertz sources. Terahertz sources mainly include: terahertz black body, Schottky amplified frequency doubl...

AI Technical Summary

Problems solved by technology

[0004] However, the system is measured in an indoor environment, and the infrared stray background radiation interferes with the measurement, which reduces the measurement accuracy of the terahertz radiation power. In addition, because the responsivity of the pyroelectric detector itself in the terahertz band is relatively low, the system Calibration of radiation power parameters of weak terahertz sources cannot be realized

Images