A terahertz spectrum analyzer

Abstract

The invention provides a terahertz spectrum analyzer which comprises a laser, three optical fiber couplers which are a first optical fiber coupler, a third optical fiber coupler and a fourth optical fiber coupler, an optical switch, a frequency shift ring, three optical delay lines which are a second optical delay line, a third optical delay line and a fourth optical delay line, a photoelectric detector, two photoelectric converters with terahertz detection antennas, two terahertz focusing elements and a terahertz optical splitter. In the acceleration of a terahertz electric field, photon-generated carriers are in accelerated motion to generate current which is proportional to the electric field amplitude of a terahertz wave, current is measured respectively, then square and sum are calculated, the radiation power of the terahertz wave is obtained, the frequency of the terahertz wave is obtained from the time sequence of the current, and the spectrum of the terahertz wave can be obtained. The terahertz spectrum analyzer has the advantages of wide spectral range, high spectral resolution and important scientific significance and application value and works at a room temperature.

Description

technical field [0001] The invention relates to a terahertz spectrum analyzer, in particular to a terahertz spectrum analyzer based on photon mixing and a photoelectric converter with a terahertz detection antenna. Background technique [0002] Terahertz (THz) waves are between millimeter waves and infrared light, corresponding to wavelengths from 3 mm to 30 μm, and generally refer to broad-spectrum electromagnetic waves with frequencies from 100 GHz to 10 THz. In recent years, due to the broad application prospects of THz waves in many fields such as material science, physics, life science, information technology, astronomy and national defense security, THz science and technology research has achieved rapid development. At present, the increasing development of THz technology has put forward the requirement for the measurement equipment to expand to higher frequencies, and the spectrum analyzer is an effective equipment for measuring the signal frequency. [0003] The ter...

AI Technical Summary

Problems solved by technology

[0003] The terahertz band is between the microwave band and the light wave band. This particularity brings many difficulties to its signal measurement, especially the frequency measurement is more difficult.

Compared with traditional microwave signals, the frequency of THz waves is too high to be directly measured by spectrum analyzers or oscilloscopes; and it is too low in frequency compared to light wave signals to use interference methods to measure frequencies

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