Returning light monitoring device of pulse fiber laser

Abstract

The invention relates to a pulse fiber laser return light monitoring device, which belongs to the technical field of laser, is connected between a laser gain fiber and a laser output head, and comprises a forward cladding optical processor, a forward fiber core optical detector, a reverse fiber core optical processor, a reverse cladding optical processor and an optical detector which are connected in sequence, and the laser gain optical fiber and the laser output head are respectively connected with the forward cladding optical processor and the optical detector. Returning light and signal light can be separated, the signal light can be accurately calibrated, and the power of the returning light can be monitored on line in real time.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a fiber laser, in particular to a pulse fiber laser return light monitoring device. Background technique [0002] Pulsed fiber lasers are widely used in the industrial field. When processing highly reflective materials, the laser reflected from the surface of the material will be coupled into the laser through the output head of the laser and act on the core components inside the laser, resulting in unstable operation of the laser. It may even cause permanent damage to the laser. In order to meet more complex application scenarios, real-time monitoring and feedback of the returned light is beneficial to protect the laser and guide the specific operation of the customer's application end, avoiding the laser from being affected by the returned light. [0003] In continuous fiber lasers, the power difference method is generally used to monitor the return light. The specific method is:...

AI Technical Summary

Problems solved by technology

Different from continuous light, for pulsed light, first, the signal optical power of the pulse varies with parameters (different pulse widths and frequencies correspond to different signal optical powers, and even customers will directly modulate the power), and there are countless combinations of parameters that customers may use. First, it is impossible to calibrate the power one by one before application, and it can only be monitored in real time during the application process; second, to monitor the signal optical power in the application, it is necessary to strictly distinguish the return light and signal light in order to accurately calibrate the signal optical power. Inversely deriving the return optical power

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