System and method for generating high-strength broadband terahertz wave by means of liquid column

Abstract

The invention discloses a system and a method for generating high-strength broadband terahertz wave by means of liquid column. The system comprises a laser, a spectroscope, a chopper, a first off-axisparabolic mirror and the liquid column, wherein the laser, the spectroscope, the chopper, the first off-axis parabolic mirror and the liquid column are successively arranged in an optical path; the foal length of the first off-axis parabolic mirror is one inch; the direction of the liquid column is vertically downwards; the laser is used for transmitting a horizontally polarized laser beam; the horizontally polarized laser beam is divided into a pump light beam and a detecting light beam through the spectroscope; the pump light is modulated by the chopper and then is focused to the liquid column by the first off-axis parabolic mirror; and a terahertz wave radiation source which can radiate the high-strength broadband terahertz wave is formed at the liquid column. According to the system and the method, the liquid column is utilized for generating the terahertz wave, and high generation efficiency is realized. The system and the method have advantages of simple system structure, low construction cost, easy maintenance and high reliability. The system and the method fill in gaps in the field of current high-strength broadband terahertz wave generation technology and have relativelyhigh scientific research value and relatively high application value.

Description

technical field [0001] The invention relates to the technical field of terahertz waves, in particular to a system and method for generating high-intensity broadband terahertz waves by using a liquid column. Background technique [0002] In recent years, with the research on terahertz radiation sources, a large number of research results have proved that solid crystals, metal materials, gases or plasmas are all good terahertz radiation sources. However, there are very few research results on the use of liquids, especially liquid water or its plasma, to generate terahertz waves. In fact, liquid water has been studied for more than 10 years as a source of various electromagnetic waves. For example: High harmonics and white light are generated by the non-linear process of focusing ultrashort-pulse laser light onto water contained in cells, jets or droplets. Furthermore, the dynamics of liquid water irradiated by laser pulses has been studied for more than two decades. The rea...

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Problems solved by technology

The power absorption coefficient of liquid water at 1 terahertz is about 220 cm -1 , means 3.6×10 9 When a terahertz photon enters a 1mm thick water film, only one photon will be radiated. It can be seen that the photon loss is very large and the terahertz generation efficiency is very low

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