2-micron thulium-doped solid laser pumped in 1.6-micron erbium-doped laser cavity

Abstract

The invention discloses a 2-micron thulium-doped solid laser pumped in a 1.6-micron erbium-doped laser cavity. An input mirror has high transmissivity for 1.5-micron laser and has high reflectivity for 1.6-micron laser; the middle mirror has high transmittance for 1.6-micron laser and has high reflectivity for 2-micron laser; the output mirror has high reflectivity for 1.6-micron laser and has partial reflectivity for 2-micron laser; the input mirror, the middle mirror and the output mirror are arranged along the output direction of the 1.5-micron pumping source; the input mirror and the output mirror form a 1.6-micron laser resonant cavity; the middle mirror and the output mirror form a 2-micron laser resonant cavity; the erbium-doped solid laser medium generates 1.6-micron laser after receiving the 1.5-micron laser and is arranged between the input mirror and the middle mirror; and the thulium-doped solid laser medium generates 2-micron laser after receiving the 1.6-micron laser, and is arranged between the middle mirror and the output mirror. The laser is beneficial for improving laser efficiency and light beam quality.

Description

technical field [0001] The invention belongs to the technical field of solid lasers, in particular to a 2 μm thulium-doped solid-state laser pumped in a 1.6 μm erbium-doped laser cavity. Background technique [0002] The intensified thermal effect of the laser working material during the power increase of solid-state lasers is one of the key issues limiting its performance improvement. As the pump power increases, the internal thermal effect of the working substance also intensifies, leading to negative effects such as thermal lens and thermally induced birefringence, which reduce the output power, and at the same time, the spatial distribution and beam quality of the laser beam tend to deteriorate. Resonant pumping (also known as co-band pumping or resonant pumping) is currently one of the main means to alleviate the thermal effect of high-power lasers. In a resonant pump laser, the pumping process and the laser generation process correspond to the same upper and lower las...

AI Technical Summary

Problems solved by technology

In this pumping scheme, since absorbing one pump photon can generate two laser upper-level ions at the same time, the quantum efficiency is close to 2, but in order to produce an effective cross-relaxation process, a relatively high doping concentration is required, so waste heat The deposition density is also relatively high, which in turn increases the thermal effect in the laser material. Affected by the thermal effect in the laser system, the laser efficiency and beam quality are reduced to a certain extent. At the same time, it also limits the laser power scaling and amplification capabilities.

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