Efficient cooling large-mode-area mid-infrared photonic crystal optical fiber and laser device thereof

Abstract

Disclosed is an efficient cooling large-mode-area mid-infrared photonic crystal optical fiber laser device. The efficient cooling large-mode-area mid-infrared photonic crystal optical fiber laser device is in a structural design of double-cladding photonic crystal fiber, wherein the internal cladding is fluoride glass; a fiber core is made of high erbium-doped fluoride glass and provided with a plurality of air holes, which are with a diameter of d and spaced at a pitch of lambda. According to the efficient cooling large-mode-area mid-infrared photonic crystal optical fiber laser device, by adjusting the structure of the air holes of the photonic crystal optical fiber, the refractive index difference between the fiber core and the inner cladding can be reduced, the mode field diameter of the optical fiber can be increased. The efficient cooling large-mode-area mid-infrared photonic crystal optical fiber laser device comprises an efficient cooling device, inert gas is fed into the air holes, the air holes can provide cooling channels to increase the specific surface area for cooling, so that heat generated inside the photonic crystal optical fiber, particularly inside the fiber core, can be rapidly guided out of the optical fiber. Therefore, the cooling problem of large-core-diameter fiber can be solved, and possibility for achieving hectowatt-scale 2.7 mm single-mode laser output can be obtained.

Description

technical field [0001] The invention relates to a novel fiber laser, in particular to a mid-infrared photonic crystal fiber with high efficiency heat dissipation and a large mode field area and a laser thereof. technical background [0002] Mid-infrared fiber is the main component of mid-infrared fiber lasers and fiber amplifiers. The properties of an optical fiber largely determine the achievable performance of a laser or amplifier. For high-power fiber lasers, the fiber is required to have a double-clad structure, and the refractive index difference between the inner and outer claddings is large to facilitate coupling. In order to have good beam quality, the fiber core is required to be single mode. In order to obtain high power, the core mode field area is required to be large. For fiber lasers with continuous output, small non-linearity such as Brillouin is also required. In addition, the fiber is required to withstand high laser power and have good stability and dura...

AI Technical Summary

Problems solved by technology

If you want to obtain hundreds of watts of laser power, due to the low quantum efficiency, the fiber coupling end needs to withstand hundreds of watts of pump power, and the core temperature of the large-diameter fiber will definitely exceed the limit temperature, so the fiber will collapse quickly

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