Terahertz parameter source coupling structure and working method thereof

Abstract

The invention relates to a terahertz parameter source coupling structure and a working method thereof. The terahertz parameter source coupling structure comprises a terahertz parameter crystal and a silicon dioxide prism array, an antireflection film with the wave length of 1000-1100nm is plated on each of two end surfaces of the terahertz parameter crystal, and the silicon dioxide prism array is coupled on an output end surface of the terahertz parameter crystal. If the size of the terahertz parameter crystal allows, the terahertz parameter source coupling structure acquires the output of a terahertz wave through the mode of bonding the crystal and a silicon dioxide prism cut at a relatively large angle, the area of mutual action of pump light and stokes scattered light in the crystal is increased, and the output efficiency of the terahertz is improved.

Description

Technical field [0001] The invention relates to a terahertz parameter source coupling structure and a working method thereof, and belongs to the technical field of terahertz lasers. Background technique [0002] Terahertz optical parametric technology is an important technology for generating Stokes light and terahertz waves. Stokes light can be obtained through the scattering of some crystals by stimulated electromagnetic dipoles, as well as continuous tunable lasers in the terahertz band . This kind of terahertz source based on stimulated electromagnetic dipole scattering has the advantages of large tuning range and high peak energy. [0003] The terahertz parametric crystals that have been discovered are usually nonlinear crystals such as lithium niobate and potassium titanyl phosphate. The entire terahertz parameter process is a complex process of mixing second-order and third-order nonlinearities. However, since the refractive index of the terahertz wave in the terahertz pa...

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Problems solved by technology

The vertical coupling output design can make the terahertz wave emerge vertically from the crystal end face. However, due to the high refractive index of the terahertz wave in the crystal, the reflection coefficient of such vertical emission is still high, and a large proportion of the terahertz wave is still not detected. coupled out

The si array coupling output has been able to obtain a relatively good output effect. Due to the small angle of the si prism array, the interaction area between the pump light and the Stokes light in the crystal is small, and the utilization rate of the pump light is relatively small. not enough

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