System and method for generating TeraHertz waves by using special laser beam

Abstract

The invention discloses a system and a method for generating TeraHertz waves by using a special laser beam. The system for generating the TeraHertz waves by using the special laser beam comprises a special beam generating device and a TeraHertz wave generating device, wherein the special beam generating device is used for generating the special beams; the TeraHertz wave generating device comprisesa lens and a BBO crystal which are parallel to each other, and the TeraHertz waves are generated after the special beam vertically transmits through the lens and the BBO crystal in sequence. Comparedwith Gauss beam, plasmas formed after lens focusing of the special beam in the invention can change correspondingly, so that the energy utilization rate is higher, and the generated TeraHertz waves are higher in energy. The system for generating the TeraHertz waves by using the special laser beam provided by the invention is simple in structure, easy to maintain and relatively high in stability,different types of special beams and different intensities of TeraHertz waves can be generated according to actual requirements, the blank in the technical field of high-intensity TeraHertz wave generation at present is filled, and the system has relatively high scientific research and practical application values.

Description

technical field [0001] The present invention relates to the field of terahertz wave technology and special beams, in particular to a system and method for exciting air plasma by using special femtosecond laser beams to generate high-intensity terahertz waves. Background technique [0002] In recent years, with the maturity of spatial light modulation technology, the field of special beams has developed rapidly. Because special beams have physical characteristics different from Gaussian beams, special beams are widely used in photophotography, imaging, surface plasmon and other fields. [0003] The technology of focusing ultrashort laser pulses in the surrounding air to directly generate terahertz waves has attracted widespread attention in recent years. This method can generate terahertz waves at a distance (up to several kilometers away), and has a bright application prospect. Although this method of generating terahertz waves has many advantages, because the energy utiliz...

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Problems solved by technology

Although this method of generating terahertz waves has many advantages, because the energy utilization efficiency of terahertz waves generated in this way is relatively low, the generation mechanism of terahertz waves has not been fully explained, and it cannot meet people's needs. Finding ways to improve the energy efficiency of terahertz waves

For this reason, scientific researchers have done a lot of work in this direction, by changing the wavelength of the laser, using two-color fields, applying bias electric fields, magnetic fields and many other methods to enhance the generation efficiency of terahertz waves. However, there is currently no Technology that enhances the generation efficiency of terahertz waves using special beams

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