Fiber laser output head having light beam focusing characteristic and power monitoring function

A fiber laser and power monitoring technology, which is applied in the direction of lasers, laser components, laser components, etc., can solve problems such as optical damage, fiber end face reflection, and excessive working power.

Inactive Publication Date: 2015-09-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the power of fiber lasers continues to increase, the requirements for the output end of the laser are also getting higher and higher. The output end surface of the fiber will be burned due to excessive power density. Excessive working power is the main problem encountered when the laser output head is working

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  • Fiber laser output head having light beam focusing characteristic and power monitoring function
  • Fiber laser output head having light beam focusing characteristic and power monitoring function

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with accompanying drawing.

[0011] like figure 1 and figure 2 As shown, a fiber laser output head with beam focusing characteristics and power monitoring function, the fiber laser output head is composed of a laser power transmission device and an external packaging device, the laser power transmission device includes a beam focusing system, a quartz end cap 3, The optical fiber 4 and the mode stripper 12, the external packaging device includes a photoelectric monitoring system 5, a water flow guide tube 6, a metal shell 7, a clamping lock 8, a water inlet connector 9, a water outlet connector 10, and a metal optical cable connector 11; the beam focusing system includes Focus lens 1, focus adjustment device 2.

[0012] The focus lens 1 is inlaid at the end of the focus adjustment device 2 .

[0013] One end of the metal cylinder 7 is fixed to the inner wall of the focus adjustment device 2 , and t...

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Abstract

The invention relates to a fiber laser output head having a light beam focusing characteristic and a power monitoring function. The fiber laser output head is composed of a laser power transmission device and an external packaging device. When myriawatt-level high-power laser passes through the laser output head, a mode stripper strips laser in forward transmission and residual pump light in a cladding layer; and a forward light detector in a photoelectric detection device detects a power of stripped scattered light. The laser is emitted by a quartz end cap; and because of increasing of an emitting end area, the emergent light power density is substantially reduced. The laser outputted by the quartz end cap is focused by a focusing lens and the size of the light spot is controlled by a focal length adjusting device. Besides, when the laser head is used for carrying out laser processing, the power of generated reflected return light is detected by a reverse light detector in the photoelectric detection device. And then a cooling device including a water flow guiding pipe, an inflow device, and a water outgoing device carries away lots of heat generated by working of the mode stripper.

Description

technical field [0001] The invention discloses a novel fiber laser output head with beam focusing characteristics and power monitoring functions, belonging to the technical field of fiber lasers. Background technique [0002] As the power of fiber lasers continues to increase, the requirements for the output end of the laser are also getting higher and higher. The output end surface of the fiber will be burned due to excessive power density. Excessive working power is the main problem encountered when the laser output head is working. Based on the above reasons, welding a quartz end cap in front of the fiber end and cooling and packaging it, and adding a photoelectric monitoring system to the laser output head can effectively solve the above problems. In addition, a beam focusing system is added to the front end of the quartz end cap to focus the beam, which improves the spot size of the output laser and can be used directly for laser processing. [0003] The laser output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/042H01S3/02G02B27/09
Inventor 王智勇赵小涵葛廷武董繁龙孙畅符聪李思源
Owner BEIJING UNIV OF TECH
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