Mode optimization output device based on conical optical fiber

Abstract

A mode optimization output device based on a conical optical fiber adopts a first mode winding area, the conical optical fiber, a second mode winding area, a corrosion area and a quartz end cap, is used for mode optimization of a high-power optical fiber laser, and is simple in structure, wide in application range and high in mode optimization efficiency.

Description

technical field [0001] The invention relates to a mode optimization output device, in particular to a mode optimization output device based on a tapered optical fiber, which is used for high power mode optimization output. Background technique [0002] In recent years, fiber lasers have been used in many directions such as industrial cutting, welding, scientific research, and medical treatment. The cost performance of fiber lasers is very high. At the same time, fiber lasers also have the advantages of small size, high efficiency, and less heat dissipation. With the above advantages, fiber lasers have gradually and rapidly realized the traditional high energy consumption, large volume, and low price in recent years. An alternative to expensive carbon dioxide lasers and YAG solid-state lasers. With the continuous popularization of fiber laser application fields, new requirements will be put forward for the output characteristics of lasers for each field of application, such ...

AI Technical Summary

Problems solved by technology

Just like the pumping method, there are certain technical requirements for the pumping wavelength laser, and it is often difficult to obtain the pumping wavelength laser. For example, the same-band pumping laser of 1080nm doped with ytterbium ion laser is 1018nm, and the high-power laser of this wavelength It is technically difficult to obtain, which makes the cost performance of the pump with the same belt extremely low

Therefore, in-band pumping often has the problem that high-power pumping wavelength lasers are difficult to obtain

As for improving the heat dissipation capacity of the active optical fiber: since the outer cladding of the active optical fiber is mainly made of acrylic resin material, the thermal conductivity of this material is poor, which leads to certain limitations in the heat dissipation capacity of the active optical fiber, and it is difficult to achieve a large degree of heat dissipation. improvement on

The optical fiber mode winding method is mainly used in optical fibers with low core numerical aperture, and the effect is poor for optical fibers with high core numerical aperture (NA>0.1); and in order to achieve mode optimization, this method often requires The optical fiber with numerical aperture is wound in a small circle with a diameter less than 5cm, so it has high requirements for the long-term mechanical stability of the optical fiber

Fiber short taper: For fiber taper technology, this technology mainly uses a fiber taper machine to perform a short-length taper treatment on the optical fiber. Due to the short length of the taper, it is impossible to make the low-order mode component laser well meet the insulation drawing. The cone condition will cause the low-order mode component laser in the fiber core to overflow to the outer cladding, forming cladding laser, that is, the insertion loss of the low-order mode is relatively large, which will have a certain impact on the safety of the optical system

Images