Medium-infrared thulium doped optical fiber laser amplifier

Abstract

The invention discloses a middle-infrared thulium-doped fiber laser amplifier which is composed of a seed light source, an optical isolator, a focusing lens, a pumping light source, a multi-path fiber coupler, double clad thulium-doped fiber, a collimating lens and a beam splitting plate. The position relationships of the components are as follows: the optical isolator, the focusing lens, the multi-path fiber coupler, the double clad thulium-doped fiber, the collimating lens and the beam splitting plate are sequentially arranged along the laser output direction of the seed light source, an input end of the seed optical fiber of the multi-path fiber coupler is positioned at the focus of the collimating lens, an output end of the seed optical fiber is welded with the double clad thulium-doped fiber, the other end of the double clad thulium-doped fiber is positioned at a front focus of the collimating lens, and the beam splitting plate and the output light beam of the collimating lens are arranged at an angle of 45 degrees. The laser amplifier has good heat dissipation characteristic, improves the pumping power and can obtain high-power mid-infrared laser output.

Description

technical field [0001] The invention relates to a laser, in particular to a mid-infrared thulium-doped laser fiber amplifier. Background technique [0002] After the advent of fiber laser in 1963, it has developed into an emerging technology integrating fiber optic technology, coupling technology and semiconductor laser technology, and has become a near-term research hotspot in recent years. High-power 2-micron band lasers have important applications in industry, biomedicine, and military affairs. At present, there are more effective methods for realizing this band of lasers: 1. All-solid-state pumped single-doped solid-state lasers (HO:YAG, Tm:YAG , Tm:YAP, etc.); 2. All-solid-state pumped double-doped solid-state lasers (Ho:Tm:YAG, Ho:Tm:LuLiF, Er:Tm:YAG, Tm:Ho:YLF, etc.); 3. One-micron band The laser is obtained by OPO technology; 4. All solid-state pumped thulium-doped or holmium-doped fiber lasers; the first three methods above may have low slope efficiency due to the...

AI Technical Summary

Problems solved by technology

The thermal problem of thulium-doped optical fiber is mainly concentrated at the input end face of the fiber. The common method is to use conduction or direct water cooling on the input end face of the fiber. to cooling and pumping; for this reason, we propose a new type of high-power mid-infrared thulium-doped fiber amplifier, which utilizes the advantages of thulium-doped fiber lasers, and at the same time obtains the spatio-temporal characteristics of mid-infrared lasers through external cavity seed injection, avoiding frequency selection and the problem of reducing the power used by the secondary pump; using a multi-channel coupler to increase the power of the pump to the fiber and taking into account the cooling problem

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