THz optical fiber laser

Abstract

The invention discloses a THz optical fiber laser, which comprises a pumping source, a coupling system, an input mirror, an output mirror and a metal coating air-core optical fiber, wherein, the metal coating air-core optical fiber is filled with THz active gas; the front end and the rear end of the optical fiber are provided with sealing caps; the pumping source is a CO2 or N2O laser which operates continuously or operates under radio frequency; the coupling system is an infrared laser lens group coupling system; and the input mirror and the output mirror are both inductive metal grids. In the technical proposal, the low-voltage THz active gas is filled into the metal coating air-core THz optical fiber with low loss to prepare the THz active optical fiber; a thick and heavy quartz tube or a large container is replaced by the THz active optical fiber; the infrared laser pumped optical fiber is used for generating THz waves; and the number of effective paths of the pumping light in theoptical fiber is greatly increased. Compared with the quartz tube or the large container, the optical fibers with the same length have higher efficiency. Moreover, due to the characteristics of lightweight, small volume and flexibility of the optical fiber, the complete set of apparatus is more compact and flexible.

Description

technical field [0001] The invention belongs to the technical field of terahertz radiation sources, and in particular relates to a fiber laser. Background technique [0002] Generally speaking, the wavelength of THz wave is between 0.03mm~1mm, and the corresponding frequency range is 0.3THz~10THz. It is electromagnetic radiation between millimeter wave and infrared light, and it is the last one in the electromagnetic spectrum that needs to be fully studied. band. Since the emission, reflection and transmission spectra of substances in the THz band contain rich physical and chemical information, THz waves are widely used in basic research fields such as physics, chemistry, astronomy, molecular spectroscopy, life and medical science, as well as medical imaging and environmental monitoring. , material testing, food testing, radio astronomy, mobile communications, satellite communications and military radar and other applied research fields have significant scientific research ...

AI Technical Summary

Problems solved by technology

The basic components of this kind of laser are the pump source and the THz wave laser generator. The advantage is that the output beam quality is better, the output power is higher, and the output can be sustained and stable. The disadvantage is that the THz wave laser generator uses relatively For thick quartz tubes or large containers, the length of the THz wave laser generating tube is generally more than 2 meters, and the diameter is about 30mm to 50mm. To a certain extent, it affects the practical application field of optically pumped THz wave laser

[0004] In recent years, people have also carried out research on the miniaturization of THz wave laser generators, mainly to shorten the length of THz wave lasers. However, after shortening, the THz signal is relatively weak, which cannot meet the requirements for use, and it is difficult to widely promote it in the field of science and technology.

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