Method capable of adjusting polarization and intensity of terahertz wave rapidly and continuously

Abstract

The invention relates to a method capable of adjusting the polarization and the intensity of a terahertz wave rapidly and continuously. According to the method, a focusing lens is arranged at the outlet of a femto-second laser; incident laser passes through the focusing lens and a doubling frequency crystal in sequence to generate frequency doubled light; the frequency doubled light and remaining fundamental frequency laser pass through a uniaxial birefringent crystal wafer together; according to the principle that the refractive indexes of the fundamental frequency laser and the frequency doubled light in a uniaxial birefringent crystal are different, the optical path difference, namely the time delay, between the fundamental frequency laser and the frequency doubled light can be changed by adjusting the thickness of the uniaxial birefringent crystal wafer and the spatial included angle between a glass piece and an incident light beam, so that the relative phase between the fundamental frequency laser and the frequency doubled light is changed; and therefore, the polarization and the intensity of the finally generated terahertz wave are adjusted. Finally, the generated terahertz wave enters a terahertz wave detection system after being filtered by a high-resistance silicon wafer. By the method, the polarization and the intensity of the terahertz wave can be adjusted rapidly and continuously; and the operation is simple, rapid and effective.

Description

technical field [0001] The invention relates to an electromagnetic wave adjustment technology, in particular to a method for rapidly and continuously adjusting the polarization and intensity of terahertz waves. Background technique [0002] For decades, terahertz waves have become an important research topic in the field of physics in the world due to its wide application prospects. Terahertz radiation is an electromagnetic wave with a frequency in the range of 0.1 to 10 THz. This band is located between microwave and infrared. It has the characteristics of rich information, sub-picosecond pulse width, high spatiotemporal coherence, and low photon energy. It has great application value in scientific fields such as astronomy, biology, computer, and communication. [0003] Due to the wide application prospects of terahertz waves, how to develop a terahertz wave source with high efficiency, high energy, compact structure, simple, continuous tuning, and stable operation at room...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the cumbersome and complicated problem of tuning the polarization and intensity of terahertz waves, and proposes a method for rapidly and continuously adjusting the polarization and intensity of terahertz waves. The spatial angle between the glass plate and the incident beam realizes rapid and continuous adjustment of the polarization and intensity of the terahertz wave

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