Method and apparatus for liquid guided pump beam

Abstract

A liquid leading pump beam method and device belongs to field of optics and laser photoelectron technique. It includes pumping light source, optical coupling device, liquid leading device and fiber. Thereinto: the optical coupling device receives the pumping light omitted by the pumping light source; liquid nozzle, the pumping beam coupled by the optical coupling device is coupled with liquid column spurted by the liquid nozzle; the central line of cooling fluid collector is aimed at the central line of the liquid nozzle; return flexible hose and liquid-in end are connected with the cooling fluid collector; radiator and circlulating pump are in series, the liquid-in port of the radiator and the liquid-out port of the return flexible hose are connected, the output end of the circlulating pump is connected with the lower end of the liquid nozzle; the liquid nozzle, the cooling fluid collector, the return flexible hose, the radiator and the circlulating pump are in series to form a liquid leading device. The invention resolves the high power pumping problem in solid laser and fiber laser, and the output power of laser can be increased, stability and reliability of laser system can be guaranteed.

Description

technical field [0001] The invention relates to a method and a device for guiding a light beam by a liquid, which can be used for a laser resonant cavity and a laser amplifier, and belongs to the technical field of optics and laser optoelectronics. Background technique [0002] In the field of solid-state lasers and fiber lasers, when high-power solid-state lasers and fiber lasers work, a large amount of pump light needs to be injected into the gain medium. [0003] In the prior art of a fiber laser, as shown in FIG. 1 , it includes a pump source 1 , an optical system 2 , an optical fiber 3 and a heat sink 4 . After the pump beam is compressed and converged by the optical system 2, it is directly incident on the end face of the optical fiber 3 and is absorbed by the optical fiber. The heat distribution at the end of the optical fiber is concentrated, and the temperature is high. It must be cooled, otherwise it will cause the coating layer of the optical fiber to burn. Fiber...

AI Technical Summary

Problems solved by technology

The heat distribution on the incident end surface is concentrated and the temperature is high. The solid laser medium must be cooled, otherwise the thermal effect caused by the temperature difference in the laser medium activation area will make the laser work unstable, the beam quality will decrease, and the thermal stress caused by the temperature difference will cause the crystal to deform. , overheating will easily cause the end film layer to be easily burned, and the solid medium will burst in severe cases, so high-efficiency heat dissipation and reduction of thermal effects are usually the main factors considered when designing high average power systems

The commonly used cooling methods in the prior art include liquid cooling and conduction cooling, both of which cool the side of the crystal, which cannot solve the problem of overheating of the end face and the center of the crystal, so the heat dissipation effect is not good; at the same time, because the center is hot and the edges are cold, the crystal The temperature distribution is more uneven, and the thermal effect and thermal stress cannot be effectively reduced

As shown in Figure 2, 5 is a crystal, conduction cooling is to use the metal heat sink 4 in close contact with the solid laser medium, and realize heat dissipation through contact conduction, because in this heat dissipation method, the quality of the cooling joint surface between the heat sink and the solid laser medium is not Very high (especially the curved surface), so the heat dissipation effect is not good, in order to ensure heat dissipation, the machining accuracy of the heat sink must also be very high

As shown in Figure 3, liquid cooling is impossible for the cooling liquid 6 to sufficiently cool the few millimeters at the end of the crystal due to the volume covered by the O-ring 17

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