MỘT PHƯƠNG ÁN THIẾT KẾ VÀ CHẾ TẠO HỆ LASER SỢI QUANG CÔNG SUẤT 20W ỨNG DỤNG TRONG LĨNH VỰC CÔNG NGHIỆP

Abstract

The article presents a design and manufacturing plan for a fiber optic laser system applied in the industrial field. The active laser medium is a fiber doped with Ytterbium (Yb3+) rare earth ions and is optically pumped by a laser diode. The configuration of the fiber laser cavity includes an emitting layer and an amplifying layer, allowing for an output laser power of over 20 W at a wavelength of 1070 nm.
The repetition frequency of the output laser pulse can be varied from 20 to 80 KHz thanks to an acousto-optic Q-switch placed in the laser cavity. The laser diode power supply allows for current adjustments from 0 to 20A, voltage of 5V, and is synchronously controlled from a central control circuit connected to a computer. Some laboratory measurement results of the fiber laser system's outputparameters are also presented in this article, including laser power, pulse width, repetition frequency, and the beam quality factor M2. The measured data have shown the stability and reliability of the system. Consequently, this fiber laser system has been used to integrate into a laser engraving device on metal material surfaces