A terahertz frequency sweep system

Abstract

The invention discloses a terahertz frequency sweep source and system, in the field of terahertz light sources, the terahertz frequency sweep source includes: a first optical frequency comb generation module, which is used to periodically emit the first original optical frequency comb of the first repetition frequency , and stretch the first original optical frequency comb into a first output optical frequency comb with a width of ns order of magnitude; the second optical frequency comb generation module is used to emit a second frequency comb with a center wavelength and a second repetition frequency with controllable bandwidth The original optical frequency comb, and stretching the second original optical frequency comb into a second output optical frequency comb with a width of ns order of magnitude, there is a repetition frequency difference between the first repetition frequency and the second repetition frequency; the coupling amplification module is used to The received first output optical frequency comb and the second output optical frequency comb perform power coupling to generate a light intensity signal at a terahertz frequency; the photoconductive antenna is used to convert the light intensity signal into a terahertz signal and emit it. In this application, a terahertz frequency scanning source with wide scanning bandwidth, high frequency scanning rate and high linearity is generated by optical beat frequency after dispersion stretching by optical fiber dual frequency comb.

Description

technical field [0001] The invention belongs to the field of terahertz light sources, in particular to a pulsed terahertz source, and more specifically to a terahertz frequency sweep source and system. Background technique [0002] Terahertz waves are electromagnetic waves with frequencies ranging from 0.1THz to 10THz, corresponding to electromagnetic wavelengths ranging from 3mm to 30μm, located between microwave and optical bands, and have unique properties: transient, broadband, low-energy, penetrating, Absorbency, fingerprint properties, etc. These properties make terahertz have great potential in wireless communication, security detection and anti-terrorism, material analysis and other fields, especially terahertz technology is vigorously promoting industrial applications. [0003] In the early stage of terahertz measurement, it mainly relied on time-domain terahertz spectrometer. Using femtosecond pulse with high peak power to generate terahertz signal is the main way...

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Problems solved by technology

[0003] In the early stage of terahertz measurement, it mainly relied on time-domain terahertz spectrometer. Using femtosecond pulse with high peak power to generate terahertz signal is the main way. It has the advantages of large bandwidth and measurement rate in the order of Hz to kHz, but it is an ultrashort pulse Type terahertz, limited resolution, high peak power, damage to some samples

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