Space Beam Coupling System and Its Closed-loop Control Method

Abstract

The invention provides a spatial beam coupling system. The system comprises a collimating and focusing module, an electric adjusting rack 3, a rod-like pohotonic crystal fiber 4, a convex lens 5, a first dichroic mirror 6, a second dichroic mirror 7, a pumping source 8, an imaging lens 9, a aperture diaphragm 10, a first spatial optical detector 11 and a second spatial optical detector 15, wherein the collimating and focusing module is arranged on the electric adjusting rack 3, and is orderly coaxial to the rod-like pohotonic crystal fiber 4, the first dichroic mirror 6 and the second dichroic mirror 7. The invention also provides a closed-loop control method of the spatial beam coupling system. The spatial beam coupling system can improve adjustment precision and coupling efficiency of spatial optical coupling, and when situations, such as temperature fluctuation and mechanical vibration, occur in environment, the spatial beam coupling system can execute active closed-loop control and perform fine adjustment to the collimating and focusing module, thus, complex manual calibration is avoided, and stability and environmental adaptability of the system are improved.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an active spatial beam coupling system and a closed-loop control method thereof. Background technique [0002] Ultra-fast laser micromachining utilizes a new type of "light energy" that interacts with materials without impact, without thermal effects, and ultra-fine and efficient cold processing mechanisms. It has non-contact, small thermal impact, high energy focus, easy operation, high flexibility, high efficiency, and With outstanding advantages such as quality, energy saving and environmental protection, it plays the role of an innovative pioneer, represents the development direction of advanced manufacturing, and leads manufacturing technology into a new era of laser manufacturing. High-energy ultra-fast femtosecond lasers have created a new field of ultra-fine, non-thermal damage and 3D space processing and processing of materials with its unique advantages such as short pul...

AI Technical Summary

Problems solved by technology

However, due to the manual adjustment, there are defects such as low adjustment accuracy, difficult adjustment process, and the inability to realize precise automatic adjustment, and poor environmental adaptability, that is, when the external environment temperature and humidity of the laser change or the slight mechanical vibration is caused by transportation, the coupling system will be broken. To redo the manual calibration adjustment

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