2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser

Abstract

The invention discloses a 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, and belongs to the field of laser techniques and non-linear optics. The 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser mainly comprises a laser pumping source, a wavelength division multiplexer, thulium-holmium codoped optical fiber, a circulator, an isolator, a saturable absorber, a saturable absorber mirror, a coupler, a polarization controller, a filter, passive optical fiber, and the like. As the thulium-holmium codoped optical fiber is taken as a gain medium and the saturable absorber and the saturable absorber mirror as passive mode-locking devices, and furthermore by changing the penetration wavelength of the tunable filter, output of 2-micro wave band, tunable wavelength and short pulse is achieved. Due to adoption of the whole structure of the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser, all-fiber welding is achieved, and the 2-micron wave band tunable thulium-holmium codoped mode-locking all-fiber laser has the advantages of simple structure, good environment stability, high efficiency and the like, and is easy in industrial application.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a 2-micron band tunable thulium-holmium co-doped mode-locked all-fiber laser. Background technique [0002] Fiber lasers are lasers that use fibers doped with rare earth elements as the gain medium. By doping different rare earth elements such as erbium, ytterbium, thulium, and holmium, the working band of the fiber laser can cover the mid-infrared band. Compared with semiconductor lasers, fiber lasers have the advantages of small size, low threshold, high efficiency, good beam quality, and no need to adjust the optical path. Among them, the 2-micron fiber laser has an important prospect in the fields of laser surgery, laser radar, and ultrafast optics because its output wavelength is close to the absorption peak of hydroxyl H-O and is within the safe range of human eyes. In recent years, with the deepening of related research on fiber lasers, 2-micron fiber lasers have bec...

AI Technical Summary

Problems solved by technology

However, most of the current 2 micron fiber lasers have only one central wavelength, and the pumping efficiency is relatively low, which will increase the operating cost and backup cost of the system, while the tunable thulium-holmium co-doped mode-locked all-fiber laser can be realized with a Tunable fiber lasers replace multiple fixed-wavelength fiber lasers. At the same time, the use of thulium-holmium co-doped fiber as the gain medium also has the characteristics of low threshold and high pumping efficiency. This kind of tunable fiber laser can also be used as a tunable high-power fiber laser. source of seeds

Images