Mode-locked fiber laser of 1.7[mu]m based on thulium-doped silica fiber

Abstract

The invention relates to a mode-locked fiber laser of 1.7[mu]m based on thulium-doped silica fiber. The mode-locked fiber laser specifically and structurally and mainly comprises a signal source of 1.7[mu]m, a first coupler, a pumping source, a wavelength division multiplexer, the thulium-doped silica fiber, a band-pass filter, a first polarization controller, a polarization dependent isolator, asecond polarization controller, common single-mode fiber, a second coupler and a fiber wire jumper head. The mode-locked fiber laser can realize short wavelength 1.7 [mu]m mode-locked fiber laser output operation in the thulium-doped silica fiber. The laser is of an all-fiber structure, the whole optical path has a simple and compact structure, operability is high, cost is low, long-term stable operation is achieved, and the laser is particularly suitable for integrated development, and has important application prospects in the fields such as multi-photon imaging and optical coherence tomography.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a 1.7 μm mode-locked fiber laser based on a thulium-doped silica fiber. Background technique [0002] The 1.7μm band fiber laser has important application prospects in the fields of biomedicine, space communication, polymer welding and laser surgery. In recent years, with the rapid development of multiphoton imaging and optical coherence tomography (OCT) technology, seeking an ultrashort pulse light source in a new wavelength range that can improve imaging depth and resolution has become a research hotspot in various research institutions. . Compared with the 800-1550nm band, 1.7μm has the characteristics of small absorption coefficient and scattering in human soft tissue, which can significantly improve the imaging depth and resolution of the device in this tissue. Therefore, the development of ultrashort pulse light sources in this band has also aroused great interest. [0003] T...

AI Technical Summary

Problems solved by technology

At present, it has been reported that a tunable femtosecond laser output near the 1.7 μm band has been obtained by using a femtosecond laser synchronously pumped by an optical parametric oscillator, but the structure is complex and bulky, and the operating cost is high

In addition, there are related reports that based on the soliton self-frequency shifting device, the tunable mode-locked fiber laser output in this band is realized in the Ytterbium-Erbium co-doped silica fiber, but the laser adopts the spatial coupling method, which is difficult to operate stably for a long time , the structure is not compact enough, and it is not easy for integrated development

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