Modeling of Output Spectra and Numerical Simulation of Thulium-doped Broadband Fiber Light Sources at 1400-1520nm, 1800-2000nm

Abstract

Lasers have a great influence in industrial processing and biomedical fields. Thulium-doped fiber lasers have good prospects for communication transmission and polymer welding. In this paper, the research method is as follows: in the pump light at 0. 79um, the values of Thulium-doped fiber, including its core radius, spontaneous radiation rate, cross-sectional absorption area, etc., are preset in advance. Then, by changing the fiber length, pumping power, and doping concentration of the fiber, the curve between the output spectrum of ASE light and the wavelength of ASE light is demonstrated. Finally, the peak power of the Thulium-doped broadband light source fiber is about 1. 6× w at L=3m, N=4× / , Pp=0. 2w. The output spectrum of thulium-doped fiber is mainly concentrated around the 2000nm wavelength band, and examples of thulium-doped fiber lasers for modern medical and industrial fields are presented. The thulium-doped fiber is the main direction of future research and the outlook for the future.