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Free electron laser based tunable narrow-band compact terahertz radiation source

A terahertz radiation source and compact technology, which is applied in the field of electron accelerators and free electron lasers, can solve the problems of large devices, shortage, and complex wavelength tuning, and achieve high peak power, continuously adjustable frequency, and improved energy conversion efficiency. Effect

Active Publication Date: 2016-07-06
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

The key problem of using an external seed laser to modulate the electron beam is the lack of a directly available THz-band seed laser, which requires more than two levels of modulation to generate beams at THz frequencies, so more equipment is required, the device is relatively large, and wavelength tuning is also difficult. more complex

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  • Free electron laser based tunable narrow-band compact terahertz radiation source
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  • Free electron laser based tunable narrow-band compact terahertz radiation source

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Embodiment Construction

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] Embodiments of the present invention provide a THz radiation source solution with compact structure, easy technical implementation, continuously adjustable frequency, narrow bandwidth, high peak power and pulse energy. It uses relativistic electron beams with adjustable intervals between micropulses and adjustable electron energy as the excitation source, and an undulator magnetic field with adjustable strength as the excitation medium to gre...

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Abstract

The invention discloses a free electron laser based tunable narrow-band compact terahertz radiation source. The free electron laser based tunable narrow-band compact terahertz radiation source comprises a laser source, a pulse accumulation light path, a reflecting mirror, a photocathode multi-cavity microwave electron gun, a solenoid coil and an undulator, wherein laser pulses emitted from the laser source are accumulated by n times through the pulse accumulation light path to generate a laser pulse string composed of 2n laser pulses, the laser pulse string irradiates on the surface of a negative electrode of the photocathode multi-cavity microwave electron gun by the reflecting mirror, and an electron bunch string is emitted from the surface of the negative electrode by a photoelectric effect, is accelerated by a microwave field generated by a microwave power source in a chamber of the photocathode multi-cavity microwave electron gun and enters the undulator after being transversely focused by a magnetic field of the solenoid coil so that electromagnetic radiation associated with THz waveband is stimulated. The technical scheme disclosed by the invention has the characteristics of compact structure, continuous and adjustable frequency and narrow bandwidth, and is easy to implement technically.

Description

technical field [0001] The invention relates to the fields of electron accelerators and free electron lasers, in particular to a tunable narrow-band compact terahertz radiation source based on free electron lasers. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency between 0.1-30THz. Since existing light sources have not completely covered this frequency band, this band is called THz gap (gap). Because of its broad application prospects in many fields such as life science, material science, communication technology and national security, it has attracted widespread attention from scientists at home and abroad. The THz source is the basis for the development of THz science, and it is also the main bottleneck for the development of related disciplines. [0003] THz radiation sources based on free electron laser (FEL) undulator radiation mainly include: superradiation of ultrashort electron bunches and bunching at THz frequency by mod...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S1/00
CPCH01S1/00
Inventor 李和廷陆亚林何志刚王琳贾启卡
Owner UNIV OF SCI & TECH OF CHINA
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