Water-cooled easy-to-clean laser output head with function of output light path and light extraction power detection

Abstract

The invention provides a water-cooled large power optical fiber laser output head with the function of output light path and light extraction power detection. The laser output head comprises a metal inner sleeve. A mode stripping unit, an expansion beam unit and an optical fiber are arranged in the metal inner sleeve. The laser output head comprises a metal outer sleeve which sleeves the outer surface of the metal inner sleeve. A cooling water passage is formed by cooling water guide grooves on the inner surface of the metal outer sleeve and the outer surface of the metal inner sleeve. The detachable pin of a photosensitive thermosensitive sensor is arranged in the laser output head. The detachable pin is inserted into the second end of the metal inner sleeve. The optical fiber is connected with the light path of the expansion beam unit, and then passes through the mode stripping unit and the detachable pin in turn. According to the invention, the laser output head is divided into the metal inner sleeve and the metal outer sleeve; the important and fragile transmission optical fiber, the expansion beam unit and the mode stripping unit are all enclosed in the metal inner sleeve of the output head; and when a cooling pipeline is blocked, the laser output head can be easily disassembled and cleaned without damaging an internal optical unit.

Description

technical field [0001] The present invention relates to the field of fiber laser technology, in particular to a water-cooled, easy-to-removable and washable laser output head with output optical path and light output power detection functions. The laser output head can be applied to laser cutting, laser welding, and laser quenching technologies. Background technique [0002] Fiber lasers have been widely used in scientific research and industrial fields in recent years because of their high energy conversion efficiency, good stability and working life. The needs of applications in these fields make the output power of fiber lasers continuously improved. For high-power fiber lasers, because the power density of the output end face of the transmission fiber is very high, any tiny defects and pollution will cause damage to the fiber, so the transmission fiber of high-power fiber lasers cannot be directly connected to the collimation and focusing unit. The end needs to be conne...

AI Technical Summary

Problems solved by technology

This method can effectively remove heat, but it has a very significant defect: the fluctuation of the water flow may cause the fiber to vibrate, affecting the stability of the output spot, and in extreme cases, the water flow may break the fiber

In addition, if the water quality is not clean, pollutants will be deposited on the surface of the optical fiber, which may cause the temperature of the optical fiber to be locally high during the demoulding process.

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