Transition metal ion concentration gradient doped zinc sulfide or zinc selenide and preparation method thereof

Abstract

The invention discloses a transition metal ion concentration gradient doped zinc sulfide / zinc selenide and a preparation method thereof. The active ion of the laser material is one or more of transition metal ions Tm<2+>, Cr<2+>, Co<2+> and Fe<2+>, and the doping concentration of the transition metal ions on two end surfaces of the laser material is in exponential distribution from high to low and is 10<16>-10<20> ions / cm<3>. The material has the characteristics of wide absorption and emission bandwidth and large absorption and emission section, and can obtain ultra-short and ultra-fast laser output with high peak power. One end of the laser material with large doping concentration is attached to a heat sink, so that heat energy generated when incident light enters the laser gain material can be quickly taken away, thus the heat effect produced by laser is reduced, and efficient laser output is achieved.

Description

technical field [0001] The invention relates to a laser material, in particular to a transition metal ion concentration gradient doped zinc sulfide / zinc selenide and a preparation method thereof. Background technique [0002] The mid-infrared (2-5μm) band is just in the two transmission windows (1-3μm, 3-5μm) of the atmosphere, and it is also located in the "molecular fingerprint area" and the "atmospheric window area", and covers the characteristics of many important atmospheric molecules Spectral lines can be widely used in remote sensing, ranging, guidance, communication, infrared photoelectric countermeasures and interference, gas detection, spectral analysis and laser medical treatment, etc., occupying an important position in the infrared band light source. At present, the main ways to realize 2-5 μm mid-to-far infrared solid-state laser are: difference frequency (DFG), optical parametric oscillation (OPO) and optical parametric amplification (OPA). These methods dete...

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Problems solved by technology

[0003] The solid-state laser is developed towards the purpose of reducing the thermal effect of the laser medium material to improve the output power and output beam quality. The laser medium material of the solid-state laser is changed from a rod shape to a slab shape, and the pumping source is changed from a lamp to a laser diode. The diode spectrum matches the absorption spectrum of the laser medium, which greatly reduces the thermal effect of the laser medium material in the solid-state laser pumped by the laser diode, but in the pump energy absorbed by the laser medium material, a large part of the light energy is still converted into heat energy It is deposited inside the medium, and heat dissipation requires cooling its surface, which causes temperature gradient and thermal stress inside the laser medium material, which causes the refractive index of the medium material to change, resulting in the existence of thermal effects, especially in high-power solid-state lasers The thermal effect of the laser medium material is extremely significant. On the one hand, this leads to the destruction of the beam quality, such as thermal lens effect, thermally induced birefringence depolarization, thermally induced wavefront distortion, etc. On the other hand, excessive thermal stress may even make the laser medium material Burst, which restricts the increase of pump power density, and then affects the increase of output laser energy and repetition rate

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