System and method for synchronizing ultrafast laser and ICCD camera by photoelectric signal

Abstract

The invention relates to a system and a method for synchronizing ultrafast laser and an ICCD camera by a photoelectric signal. By the system and method, an ultrafast laser processing process and an ICCD camera electronic shutter exposure process are operated synchronously, and a transient process of interaction between the ultrafast laser and a material is captured accurately in real time. When the sequential order of the laser processing process and ICCD camera electronic shutter exposure is adjusted, the problem that the ICCD camera electronic shutter exposure process cannot be synchronizedwith the laser processing process precisely caused by light emitting time instability of ultrafast laser is solved. According to the system and the method, an initial laser beam is divided into a signal laser beam and a processing laser beam on the basis of not changing original laser beam focusing condition and not influencing processing; time synchronization of ICCD camera electronic shutter exposure and the laser processing process is realized in a mode of converting signal laser into a pulsed electrical signal and adjusting the laser propagation distance, and an effective time series guarantee for analyzing an evolution process of the interaction between the ultrafast laser and a matter is provided.

Description

technical field [0001] The invention relates to a synchronization system of a laser and a camera, in particular to a system and a method for synchronizing an ultrafast laser and an ICCD camera with a photoelectric signal. Background technique [0002] CCD cameras are often used in the laser processing process to determine the processing position, laser beam quality inspection and real-time monitoring of the processing process. The CCD camera connection method is usually triggered by a computer or a delayer, and the synchronization between the CCD camera and the laser processing is realized by setting the trigger signal delay. Chinese patent 201810376733.3 uses a high-speed camera to monitor the laser additive manufacturing process in real time and synchronously, but the minimum exposure time of the high-speed camera is 1 μs, which cannot reach the level of monitoring ultra-fast laser processing. Chinese patent 201721481126.0 connects the CCD with the computer and monitors t...

AI Technical Summary

Problems solved by technology

Chinese patent 201810376733.3 uses a high-speed camera to monitor the laser additive manufacturing process in real time and synchronously, but the minimum exposure time of the high-speed camera is 1 μs, which cannot reach the level of monitoring ultra-fast laser processing

Chinese patent 201721481126.0 connects the CCD with the computer and monitors the changes on the surface of the object processed by the femtosecond laser through the CCD, but the CCD and the laser fail to achieve precise synchronization in time, and cannot strictly capture a series of ultrafast laser-matter interactions in strict accordance with the time sequence image

While adjusting the sequence of laser processing and ICCD camera electronic shutter exposure, it solves the problem that the ICCD camera electronic shutter exposure process cannot be accurately synchronized with the laser processing process due to the instability of ultrafast laser light emission time during ultrafast laser processing

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