Device and method for generating tunable terahertz radiation from hollow-core laser plasma

Abstract

The invention discloser a device and a method for generating tunable terahertz radiation by use of hollow laser plasma. The objectives of the invention are that the hollow plasma is formed through ionization of hollow laser and an inert gas tunnel; the hollow plasma has enormous capability to restrain and convert electromagnetic energy; the electromagnetic energy restrained and stored in the hollow plasma is converted into terahertz waves; and the radius and density of the hollow plasma is adjusted by adjusting the radius of the hollow laser, so adjustment of the frequency of the terahertz waves is achieved. The device provided by the invention comprises a hollow laser generator and a terahertz radiation generation device. The terahertz radiation generation device comprises a base body which is internally provided with an energy storage cavity. A laser channel penetrating the base body is arranged on the base body of the two ends of the energy storage cavity. An electrode is arranged in the energy storage cavity and is connected with a direct current power supply or a pulse driving source. A sealed tee is arranged on the base body and communicates with the energy storage cavity.

Description

technical field [0001] The invention belongs to the technical field of terahertz waves, and in particular relates to a device and method for coordinating terahertz radiation generated by hollow laser plasma. Background technique [0002] In the terahertz wave technology and application, the research of terahertz radiation source is an important link in the development of terahertz technology, and the terahertz wave source with high efficiency, high power, ultra-wide spectrum and miniaturization is several important directions of its research. Terahertz radiation sources are mainly realized through optical technology, semiconductor, electronic technology, etc., including the following categories: [0003] (1) Terahertz wave source based on optical technology: one type is to generate ultrafast photocurrent in photoconductive switches or semiconductors, and its mechanism is based on the photocarriers generated by ultrashort pulse laser irradiation on semiconductor materials und...

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Problems solved by technology

[0007] However, the interaction between the laser and the atmospheric plasma reported in the previous literature is a solid laser beam to generate a solid plasma, which radiates THz waves by plasma oscillations. However, the ability of solid plasma to confine and convert electromagnetic energy is weak, which limits the generation of THz waves. With THz power, the radius density of the solid plasma is uniform and cannot be adjusted, so that the frequency of the generated terahertz radiation cannot be adjusted. The existing devices are expensive and cannot meet the needs of actual experiments.

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