An ultra-broadband terahertz Brewster vacuum window and its preparation method

Abstract

The invention discloses an ultra-wideband terahertz Brewster vacuum window and a production method thereof. The ultra-wideband terahertz Brewster vacuum window adopts a window plate supporting frame, wherein the window plate supporting frame comprises an elliptical bottom surface and a circular groove; through the elliptical bottom surface, an elliptical section of a cylindrical waveguide is welded, and through the circular groove, a circular window plate is welded, so that electromagnetic wave is propagated from the cylindrical waveguide to the circular window plate; during welding of the circular window plate, stress distribution is relatively uniform, and when the circular window plate is welded with the window plate supporting frame, the influence of stress can be reduced to avoid cracking; a rectangular through hole is formed in the window plate supporting frame, and the influence of the stress can be reduced when a passing condition of the wave is met, so that welding success rate is greatly increased; the structures are connected in a welding manner so as to meet a sealing vacuum requirement; the thickness of the circular window plate meets a requirement that reflected wave and the re-refracted wave are counteracted with each other, so that the transmission efficiency is improved; the ultra-wideband terahertz Brewster vacuum window can achieve ultra-wideband transmission of the electromagnetic wave within a terahertz wave band, has good vacuum sealing performance, and has the advantages of easy production and low price.

Description

technical field [0001] The invention relates to the field of broadband vacuum output windows, in particular to an ultra-wideband terahertz Brewster vacuum window and a preparation method thereof. Background technique [0002] When natural light is reflected and refracted on the dielectric interface, the reflected light and refracted light are generally partially polarized light. Only when the incident angle is a certain angle, the reflected light is linearly polarized light, and its vibration direction is perpendicular to the incident surface. The specific angle is called Brewster's angle. The reflected light and the reflected light path are on the same plane (called the incident plane), and the polarized light parallel to this plane is P polarized light (TM mode), and the polarized light perpendicular to this plane is S polarized light (TE mode) . When both P-polarized light and S-polarized light are incident at Brewster's angle, all P-polarized light is transmitted. [...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of complicated structure, difficult actual manufacture and high cost in the prior art, especially to solve the demand for ultra-broadband vacuum sealing in the terahertz band and the stress problem of the structure in the process of design and processing, the present invention provides a relatively simple Structured ultra-broadband terahertz Brewster vacuum window and its preparation method

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