Cladding pumping single-mode terahertz fiber laser

Abstract

The invention discloses a cladding pumping single-mode terahertz fiber laser, and the laser comprises a continuous tunable carbon dioxide laser, a zinc selenide convex lens, a zinc selenide concave lens, a mid-infrared hollow-core fiber, a copper-plated reflecting mirror with a centrifugal hole, a composite single-mode terahertz hollow-core fiber and a gold-plated quartz crystal output mirror, which are arranged in sequence; two ends of the mid-infrared hollow-core fiber are respectively connected with a fiber adapter; after the single-mode terahertz hollow-core fiber is connected with the fiber adapter, the two ends of the single-mode terahertz hollow-core fiber are connected with a vacuum air chamber I and a vacuum air chamber II respectively, the copper gold-plated reflecting mirror with the centrifugal holes is packaged in the vacuum air chamber I through a flange, and the gold-plated quartz crystal output mirror is packaged in the vacuum air chamber II through a flange. A vacuumizing system is further connected between the vacuum air chamber I and the vacuum air chamber II, and air pressure control is conducted through the vacuum valve I and the vacuum valve II. The laser overcomes the defects that an ordinary optical pump terahertz laser is large in size and low in light beam quality, and high-power single-mode terahertz output is difficult to achieve.

Description

technical field [0001] The invention relates to the technical field of terahertz lasers, in particular to a cladding-pumped single-mode terahertz fiber laser. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency of 0.1-10THz, which have many unique advantages, such as the ability to penetrate non-metallic materials and non-polarized substances, and have extremely low photon energy, so they are widely used in medical imaging and security inspections , environmental monitoring, atmospheric remote sensing, and basic physics research. At present, researchers have developed a variety of terahertz radiation sources, but most of them require harsh working environments or high operating costs. Optically pumped terahertz lasers have attracted much attention because of their high output power and long-term stable operation at room temperature. However, their disadvantages are that the equipment is bulky and the energy conversion efficiency of ...

AI Technical Summary

Problems solved by technology

Optically pumped terahertz lasers have attracted much attention because of their high output power and long-term stable operation at room temperature. However, their disadvantages are that the equipment is bulky and the energy conversion efficiency of the pump laser is low. Conversion efficiency of optically pumped terahertz lasers crucial

[0003] In recent years, with the development of anti-resonant hollow-core fibers and the proposal of various low-loss terahertz materials, researchers have begun to propose terahertz fiber lasers based on hollow-core fibers, but the end-pumping method is generally used. Due to the lack of high-efficiency mid-infrared / terahertz band splitting devices, the end-pumped terahertz fiber laser still needs to use a small hole coupling input mirror, which leads to the inability of the terahertz resonator to be in an optimal resonance state, which seriously affects the performance of the terahertz laser. Output power and beam quality, and part of the generated terahertz laser will be lost through the small hole at the input end of the pump light

In addition, few studies have considered the single-mode characteristic of THz laser output, which is also an important factor affecting beam quality

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