Narrow-linewidth 2-micron laser device
A laser, narrow linewidth technology, used in lasers, laser parts, phonon exciters, etc., to achieve high beam quality, good stability, and improved stability.
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Embodiment 1
[0019] refer to figure 1 , the 1.9 μm laser pump source 1 of this embodiment adopts a fiber laser doped with thulium ions, the maximum output power is 50 W, the numerical aperture of the fiber is 0.22, and the core diameter is 200 μm. The spot diameter is 360 μm, and the beam waist is located in the middle of the laser crystal. The holmium ion-doped laser crystal 3 is a Ho:YAG laser crystal with a holmium ion doping concentration of 0.7%, with a size of 3mm×3mm×50mm and a size of 3mm×3mm. The two end faces are optically polished and coated with 1.9-2.1μm anti-reflection film. The four sides are roughened and then wrapped with indium foil and fixed with a heat sink to take away the heat generated in the crystal by conduction cooling. Q switch 4 adopts Gucci's acousto-optic Q switch, the size of the sound hole is 6mm, the center frequency is 41MHz, the RF power is 50W, and the diffraction efficiency is >85% (for 2.1μm).
[0020] The first cavity mirror 5-01 is a plano-concave m...
Embodiment 2
[0022] see figure 2 , this embodiment is improved on the basis of Embodiment 1, and the difference from Embodiment 1 is mainly: the 1.9 μm laser pump source 1 adopts a solid-state laser device doped with thulium ions, and two laser crystals doped with holmium ions 3. The size is 3mm×3mm×30mm, the concentration of doped holmium ions is 1%, the reflectivity of the third cavity mirror 5-03 to the 2.1μm laser is R=50%, and the reflectivity of the feedback mirror 6 to the 2.1μm laser is R=55% .
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