Terahertz frequency sweeping source and system

Abstract

The invention discloses a terahertz frequency sweep source and system, and belongs to the field of terahertz light sources. The terahertz frequency sweep source comprises a first optical frequency comb generation module used for periodically emitting a first original optical frequency comb of a first repetition frequency and stretching the first original optical frequency comb into a first outputoptical frequency comb with ns magnitude width; a second optical frequency comb generation module which is used for transmitting a second original optical frequency comb of a second repetition frequency with controllable central wavelength and bandwidth and stretching the second original optical frequency comb into a second output optical frequency comb with ns magnitude width, and repetition frequency difference exists between the first repetition frequency and the second repetition frequency; a coupling amplification module which is used for carrying out power coupling on the received firstoutput optical frequency comb and second output optical frequency comb to generate a light intensity signal with terahertz frequency; and a photoconductive antenna which is used for converting the light intensity signal into a terahertz signal and transmitting the terahertz signal. The terahertz frequency sweeping source with wide scanning bandwidth, high frequency sweeping rate and high linearityis generated by optical beat frequency after dispersion stretching is carried out through the optical fiber double-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 met...

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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 method. 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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