A dual-wavelength pumped thulium-doped laser based on gsa and esa

Abstract

The invention discloses a GSA and ESA dual-wavelength pumped thulium-doped laser, which is composed of a GSA pump source, an ESA pump source, a pump light beam combiner, an input mirror, a thulium-doped laser medium and an output mirror. GSA is the ground state absorption, corresponding to the thulium-doped laser medium 3 h 6 → 3 h 4 transition, ESA is excited state absorption, corresponding to 3 f 4 → 3 h 4 transition. Pumped by a GSA pump source, based on 3 h 6 → 3 h 4 The ground state absorption caused by the transition will change the Tm in the thulium-doped laser medium 3+ ion pumping to 3 h 4 Energy level, realize the first layout of the number of particles in this energy level. At the same time, the cross-relaxation process between thulium ions will further realize the metastable state 3 f 4 The particle population layout of the energy levels. Pumped by the ESA pump source, using 3 f 4 → 3 h 4 The excited state absorption caused by the transition will 3 f 4 The number of particles accumulated on the energy level is precisely pumped to 3 h 4 energy level, achieve 3 h 4 The second layout of the number of energy level particles. The scheme of pumping thulium-doped laser medium by GSA and ESA dual-wavelength that the present invention proposes can effectively improve 3 h 4 → 3 h 5 The layout of the number of particles on the energy level of the transition increases the laser output power in the 2.3-2.5μm band.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a thulium-doped laser based on GSA and ESA dual-wavelength pumping. Background technique [0002] Tm 3+ The ion energy level structure is rich, and it has the widest wavelength tuning range among all known rare earth ions. The potential transition can cover 0.8-3.8 μm, and it can be pumped by multiple wavelengths and obtain laser operation of multiple wavelengths. Currently targeting Tm-doped 3+ Most of the research work on lasers is focused on 3 F 4 → 3 H 6 The transition process, its emission wavelength is 1.8-2.1μm (depending on the host material). In fact, Tm 3+ Potential laser transition processes are diverse, with emission wavelengths in the 2.3-2.5 μm band 3 H 4 → 3 H 5 The jump is particularly noticeable. [0003] The 2.3-2.5μm band laser operation based on Tm-doped laser medium has the following advantages: (1) Four-level laser operation at room temperature. ...

AI Technical Summary

Problems solved by technology

Use at the same time 3 h 4 + 3 h 6 → 3 f 4 + 3 f 4 The cross-relaxation process will further achieve the metastable state 3 f 4 Particle population distribution of energy levels

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