A packaging system for rod-shaped rare-earth doped optical fiber

Abstract

The invention provides a rod-shaped rare-earth-doped optical fiber packaging system, comprising a rare-earth-doped optical fiber, an end cap, a metal heat-conducting pipe, a water-conducting pipe, and an adjustable tension device. The input end and the output end of the rare earth-doped rod-shaped optical fiber are respectively welded with end caps, the tension control device is used to straighten the optical fiber without introducing shearing force, the metal heat-conducting pipe wraps the optical fiber, and the heat-conducting liquid is filled between the metal heat-conducting pipe and the optical fiber. And sealed, the aqueduct wraps the caps at both ends and the optical fiber with the metal heat pipe, and the flowing liquid is injected between the aqueduct and the metal heat pipe to take away the heat of the end cap and the metal heat pipe, so as to ensure the effective and uniform heat dissipation of the rare earth-doped fiber and no stress is introduced. The beneficial effects of the invention are as follows: the installation, disassembly and transportation of the rare-earth-doped optical fiber are convenient; the end cap is not easy to fall off without shearing force; Reduce end cap shearing force; 360-degree heat dissipation without dead ends, and heat dissipation is greatly improved.

Description

technical field [0001] The invention relates to the field of optical fiber lasers, in particular to a packaging system for rod-shaped rare-earth-doped optical fibers. Background technique [0002] In recent years, with the further development of ultrafast fiber lasers toward higher power and higher energy, large mode field rare earth-doped fibers, especially rod-shaped photonic crystal fibers, have become more and more widely used. The optical fiber has no coating structure, the diameter can reach 1mm, which is much larger than that of ordinary optical fibers, and the length of use is shorter than that of ordinary optical fibers, generally about 0.8 to 1 m. In order to increase the damage threshold and reduce the influence of the external environment on the internal pore structure, large-sized end caps (6-8mm) need to be welded at both ends. Rod-shaped photonic crystal fiber has the advantages of high amplification efficiency, good mode, and small nonlinearity, but it is no...

AI Technical Summary

Problems solved by technology

Rod photonic crystal fiber has the advantages of high amplification efficiency, good mode, and small nonlinearity, but it is not polarization-maintaining, cannot be stressed, cannot be bent, and has poor heat dissipation (surrounded by air holes). How to effectively package the fiber needs to be solved The problem

[0003] In the conventional packaging method, the end cap does not get effective heat dissipation, and there is an obvious temperature difference between the end cap and the optical fiber. The optical fiber is easy to warp in the vertical dimension, and the copper tape cannot be fixed well for a long time, resulting in a significant displacement of the output spot, which affects Laser performance

In the prior art, the shear force is directly introduced at the fusion joint between the end cap and the optical fiber, making the fusion joint very fragile and easy to be damaged. In addition, the entire optical fiber is suspended in the air, and the wind force is also a stress that the rod-shaped optical fiber cannot bear, which will lead to optical fiber performance such as: The mode, mode field, amplification efficiency, polarization state maintenance, etc. all change, which is not suitable for the uniform heat dissipation required by the space-coupled rod-shaped fiber amplifier, and does not consider the heat dissipation of the end cap, and does not consider the performance of the amplified fiber caused by uneven heat dissipation. (Mode, mode field, amplification efficiency, polarization state maintenance, etc.) changes, and the performance changes caused by the stress of the fiber are not considered

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