Tunable ytterbium-doping double-clad fiber mode-locked laser

Abstract

The invention discloses a tunable ytterbium-doping double-clad fiber mode-locked laser which belongs to the technical field of lasers. The tunable ytterbium-doping double-clad fiber mode-locked laser is in an annular cavity structure, takes a large-core diameter double-clad ytterbium-doping fiber as a gain medium and works on a total positive dispersion area. The tunable ytterbium-doping double-clad fiber mode-locked laser realizes the mode locking self-starting and stably carries out mode locking by dint of a nonlinear polarization rotation technology and a spectrum filter, is adjustable in filtering bandwidth because the spectrum filter comprises a grating and a slit with adjustable width, has a tuning function and can continuously tune the center wavelength of an output pulse within a gain bandwidth range. The tunable ytterbium-doping double-clad fiber mode-locked laser disclosed by the invention realizes the total positive dispersion mode locking of the large-core diameter double-clad fiber by adopting nonlinear polarization rotation and a spectrum filter technology, obtains the ultrashort-pulse laser output supporting high power and high single-pulse energy, is continuously tunable in center wavelength and is convenient to operate and large in tuning range by composing the spectrum filter by adopting the grating and the slit.

Description

technical field [0001] The invention relates to a tunable ytterbium-doped double-clad fiber mode-locked laser, which can output ultrashort pulses with high power, large single pulse energy and adjustable center wavelength, and belongs to the field of laser technology. Background technique [0002] Diode-pumped mode-locked fiber lasers have attracted great attention from researchers in recent years due to their compact structure, low cost, good heat dissipation, and high output beam quality, and have become a hot spot in the field of ultrashort pulse laser technology. direction. Among them, the ytterbium-doped silica fiber has a light-to-light conversion efficiency as high as 80%, and the large gain bandwidth supports Fourier transform-limited pulses less than 30fs, and the increasingly mature double-clad technology allows the fiber to use high-power multimode semiconductor lasers directly pumping, making Ytterbium-doped fiber especially suitable for the development of high-...

AI Technical Summary

Problems solved by technology

These two types of fully positive dispersion mode-locked fiber lasers are inserted with filters to provide spectral filtering function, which is inconvenient to adjust the filtering bandwidth, and the output wavelength is single, without tuning function

[0005] Literature [4] (Kong L., Xiao X.and Yang C., Tunable all-normal-dispersion Yb-doped mode-locked fiber lasers, Laser Phys., 2010, 20(4): 834-837), literature [ 5] (Lou J.W., Currie M.and Fatemi F.K., Experimental measurements of solitary pulse characteristics from an all-normal-dispersion Yb-doped fiber laser, Opt.Express, 2007, 15(8): 4960-4965) reported the work In the tunable mode-locked fiber laser in the full positive dispersion region, both structures use a tunable filter as a spectral filter and realize the tuning function, but the gain fiber is a common single-mode fiber, which also limits the mode-locked power of the two lasers. Below 100mW

The Chinese invention patent "a tunable all-fiber mode-locked laser" (CN101969174A) proposes to use a single-mode tunable band-pass long-period fiber grating system to tune the output wavelength. The tuning range is 0-12nm, but the fiber grating must rely on The external environment temperature or stress changes to realize the tuning function, the implementation is more complicated and the tuning range is narrower

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