Yb³⁺ Doped Double-clad Fiber Laser Theoretical And Experimental Research

In recent years, the Yb3+ doped double-clad fiber laser is widely concerned because of its low-cost, low-threshold, narrow bandwidth, easy-to-production, high efficiency, can be coordinated, compact and cost-effective advantages. The double-clad fiber has a large range of applications in communication, sensing, industrial, military, and optical information processing, medical and other fields. Now, I use both theoretical and experimental aspects of system performance to analysis of Yb3+ doped DCFL.1. This paper briefly describes the characteristics and types of double-clad laser, and from the specific performance to analyze of situation and application prospects. Finally, it describes the main research contents of this paper.2. According to Yb3+ doped double-clad fiber laser system of the basic composition and working principle, this paper introduced the energy levels of Yb3+ ions structure, spectral characteristics and performance such as stimulated emission; and introduced the double-clad fiber structure, the inner cladding structure and the absorption efficiency; in addition, it introduced several cladding pump technology and resonant cavity technology, these are the key technologies in the Yb3+ doped DCFL system; under the laser in the double-clad optical fiber before and after the transfer equation and Yb3+ ions steady-state rate equation pump light, it uses a simplified theoretical model, launched the Yb3+ doped DCFL output characteristics and laser cavity parameters of the relationship between the expression. And it takes advantage of the Matlab numerical simulation of the laser and pump light power distribution, analyzes of endoscopic (optical transmission), pump wavelength, slope efficiency, threshold, the gain medium length of the laser output effects. It provides a theoretical basis for experimental optimization.3. This paper briefly describes the laboratory equipment needed, including the gain medium, resonant cavity pump, source device, pump coupling system, etc. It focused on the end-processing of fiber test flow. In this paper, hand-grinding and polishing machines are on two fronts discussion. Through different polishing processes, we use video amplification instrument and connectors, interference tester face geometry inspection to check grinded geometry, and it test transmission and optical fiber end face grinding results.4. It describes the fiber laser frequency stability and power stability of the concepts and factors, and used power meter and spectrum measured stability. We use standard deviation to describe the both of stability.