Coherent terahertz radiation generating device and method based on compact accelerator

Abstract

The invention provides a coherent terahertz radiation generating device based on a compact accelerator. An ultrafast laser of the coherent terahertz radiation generating device is set to generate ultrafast laser pulses; the ultrafast laser, the first beam splitting piece and the first reflecting mirror are sequentially arranged on a first axis in the light path direction, the first beam splitting piece and the compact injector are sequentially arranged in the light path direction, and the first reflecting mirror, the pulse broadening and beam splitting system and the laser modulation system are sequentially arranged in the light path direction; the compact injector generates a high-energy electron beam, and the compact injector, the laser modulation system and the terahertz radiation system are sequentially arranged in the transmission direction of the high-energy electron beam and located on the same horizontal plane. The invention also provides a corresponding coherent terahertz radiation generation method. According to the coherent terahertz radiation generation device, the pulse broadening and beam splitting system and the laser modulation system are utilized to realize effective modulation of high-energy electron beams, and coherent terahertz radiation with high pulse intensity and continuously tunable full terahertz wave bands can be generated.

Description

technical field [0001] The invention belongs to the field of terahertz optical instruments, and in particular relates to a coherent terahertz radiation generation device and method based on a compact accelerator. Background technique [0002] The terahertz frequency band is located between microwave and infrared light, and has very broad application prospects in basic scientific research fields such as physics, chemistry, biology, and information, as well as technical fields such as materials, communications, and safety detection. Since terahertz radiation is between conventional optics and microwaves, limited by materials, it is difficult to generate terahertz radiation based on conventional microwave technology and optical means. In recent years, with the continuous advancement of ultrafast laser technology, terahertz radiation has been developed rapidly. However, the current terahertz generation methods based on ultrafast lasers still have low radiation power and a small ...

AI Technical Summary

Problems solved by technology

[0004] Among them, the accelerator based on the storage ring can generate incoherent terahertz radiation, but the terahertz radiation pulse intensity based on the storage ring is low

[0005] Another method is to use a linear accelerator to accelerate the electron beam to relativistic energy, and then send the electron beam into an undulator or an optical resonant cavity to generate synchrotron radiation. However, the current terahertz light source based on a linear accelerator is generally large in scale. And it is difficult to realize the generation of fully coherent terahertz radiation and the continuous adjustment of its central wavelength

Specifically, the disadvantages of this method of generating THz radiation based on a linear accelerator are: 1) There is no high-gain process, and the radiation intensity is low; 2) In the existing methods for generating THz radiation, the frequency of THz radiation can be tuned , and generally adjust the frequency by adjusting the energy of the electron beam and the magnetic gap of the undulator, but the adjustable frequency range is relatively narrow, generally in the range of 0.3-several terahertz; 3) poor coherence, specifically, the prior art Generally, ordinary undulator radiation and bent iron radiation are used, and their coherence is poor; 4) Terahertz light sources in the prior art are generally large in scale

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