A wavelength-tunable graphene oxide mode-locked all-fiber thulium-doped laser

Abstract

The invention belongs to the technical field of the structure or shape of an activation medium, and discloses a wavelength-tunable graphene oxide mode-locked all-fiber thulium-doped laser. A pump source inputs a single-mode fiber through a beam combiner by pumping, the thulium-doped single-mode double-clad fiber is fused with the single-mode fiber, one end of the multimode interference filter is fused with the thulium-doped single-mode double-clad fiber, and the other end is fixed on a precision translation table. FC / APC fuse is fused with multimode interference filter, polarization-independent isolator is fused with FC / APC fusing, polarization-independent isolator is fused with output coupler, output end of coupler is fused with collimator with 1.5 m tail fiber and polarization controller, polarization controller is fused with beam combiner. Graphene oxide is a new material with excellent properties and low cost. The tenability of 2 [mu]m output band in all-fiber fiber laser is realized, the advantages of simple structure, convenient operation and high stability are achieved, and more practical application can be met.

Description

technical field [0001] The invention belongs to the technical field of the structure or shape of an active medium, in particular to a wavelength-tunable graphene oxide mode-locked all-fiber thulium-doped laser. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: ultrashort pulse laser usually refers to an optical pulse with a pulse width of picosecond (ps) or femtosecond (fs) in the time domain. The generation of pulsed laser is usually obtained by Q-switching technology or mode-locking technology, but Q-switching technology generally can only obtain pulses with a pulse width of nanosecond (ns) level. If you want to obtain shorter laser pulses, you need to use lock. mold technology. Mode-locking in lasers generally refers to phase-locking the different modes operating in the laser cavity. According to the mode locking mechanism, there are mainly active mode locking and passive mode locking. With the development of...

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Problems solved by technology

[0004] (1) Existing technology-the thulium-doped mode-locked fiber laser based on graphene oxide saturable absorber cannot be tuned in wavelength and cannot meet more applications; it adopts a half-space structure, its stability is not high and its structure is complex, or it can be completely The fiber grating is introduced into the fiber structure for tuning. The manufacturing process of the fiber grating is complicated, and the insertion loss is large, so the tuning is inconvenient.

[0005] (2) Existing technology 2. The tunable all-fiber thulium-doped fiber laser based on the mode-locked carbon nanotube saturable absorber of the tapered fiber needs expensive large-scale fusion splicing machines and ultra-clean laboratories, and the production conditions are high.

[0006] (3) Prior Art 3. The 2 μm band tunable fiber laser based on the multimode interference filter is expensive to use a coreless silica fiber, and it is not easy to obtain in the market; a layer of refractive index matching liquid is also needed around the coreless fiber. Changing the effective diameter of the coreless fiber to achieve the purpose of selecting the center wavelength is complex and expensive, and the insertion loss caused by the fusion of the coreless fiber and the ordinary single-mode fiber is large and cannot be ignored

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