A terahertz optical beam expansion homogenization device

Abstract

The invention belongs to the technical field of terahertz, and provides a terahertz light beam expanding and homogenizing device, which is used to shape a terahertz beam emitted by a terahertz source, and make the energy distribution of the beam more uniform while expanding the beam. The beam expander and homogenization device includes the following parts in sequence according to the passing order of the beam: primary reflector, primary microspherical reflector array, secondary microspherical reflector array, terahertz lens and secondary reflector, and the front of the primary reflector is The terahertz source, the target object behind the secondary reflector. A certain angular relationship and an appropriate distance are maintained between each part. After the terahertz light is expanded and homogenized by the two-stage microspherical mirror array, it is shaped and emitted by the terahertz lens. The advantage of the present invention is that: while achieving the purpose of expanding the beam of the terahertz light, the energy distribution of the outgoing terahertz light is uniformized from a Gaussian distribution to a rectangular distribution, so that it can meet the requirements as a light source for a terahertz imaging system .

Description

technical field [0001] The invention belongs to the technical field of terahertz imaging, and in particular relates to a device for expanding and homogenizing a terahertz radiation beam based on a microspherical mirror array. Background technique [0002] Terahertz light (Terahertz / THz) usually refers to electromagnetic light with a frequency between 0.1 THz and 10 THz, which is at the border of low light and infrared light, so it has the advantages of both electronics and optics. Terahertz imaging technology is a technology in which a terahertz imaging system collects terahertz light from the target and the background and converges it on the focal plane, and obtains images of the target and the background after processing. [0003] Since terahertz imaging systems are active, a suitable light source is a must. However, the laser light sources currently used are not suitable for direct use as light sources for terahertz imaging systems. The first is that the spot area of ​​...

AI Technical Summary

Problems solved by technology

The use of this optical system can have a better beam expansion effect, but the shortcomings of this system are also obvious. First, the uniformity of the beam after expansion has a certain improvement, but it is not very ideal, and the beam after expansion The divergence angle of the system is small; secondly, this kind of system is difficult to adjust and is highly sensitive to optical axis misalignment, and slight deviations will cause astigmatism

[0005] It can be seen from the above that there are many problems in the existing technology, and it is necessary to adopt a new technology to solve the problem of beam expansion and homogenization of terahertz light

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