1.0μm Ytterbium-doped Ultrashort Pulse Mode-locked Fiber Laser

Ultrashort pulse laser is the important means and tools for physics, chemistry, biology,optoelectronics, laser spectroscopy, nonlinear optics and ultrafast optics. High-repetition-rateultrashort pulse laser has wide application foreground in high speed optical sampling andaspects of ranging and so on. The technique of passive mode-locking is the most direct andeffective way of creating ultrashort pulse laser and the set of laser is compact and stable.Specially, the passive mode-locking fiber laser based on nonlinear polarization evolution cannot only obtain picosecond or even femtosecond ultrashort pulse directly, but also achieve theall-fiber configuration of laser which is convenient for compact encapsulation and improvethe anti-jamming ability of laser. For the recent years, high-repetition-rate ytterbium-dopednonlinear polarization evolution mode-locking pulse fiber laser at1.0μm has been developedrapidly, but the process of all-fiber configuration is slow. Affected by the rare earth dopingconcentration of silica glass, the gain of fiber is not high enough. Using the ytterbium-dopedphosphate glass fiber with a net gain coefficient up to5.7dB/cm drew by ourselves as gainmedium, focusing on the all-normal-dispersion ytterbium-doped ultrashort pulse all-fiber laserat1.0μm based on nonlinear polarization evolution mode-locking technique, we finished thefollowing issues:(1) We gave the numerical simulation of the all-normal-dispersion nonlinear polarizationevolution ring cavity laser by the pulse trace model together with coupled complex nonlinearSchr dinger equations. We used the pulse vector theory together with coupled complexnonlinear Schr dinger equations to get the solutions of vector solitons in birefringent fibersand simulated the vector solitons in high birefringent fibers.(2) In high birefringent ring cavity, we successfully observed dual-peak dark-brightGVLVS, sidebands dark-dark PLVS, single-peak dark-bright PLVS and dual-peak dark-darkGVLVS. A detailed study of the spectral characteristics, time-domain oscilloscope trace andradio frequency spectrum of each type of vector soliton have been given. And the existenceand stability have been analyzed.(3) Using the high gain ytterbium-doped phosphate glass fiber drew by ourselves as gain medium, we established the ring cavity of all-normal-dispersion all-fiber ring laser based onnonlinear polarization evolution mode-locking technique. The dissipative soliton pulse with a33MHz fundamental repetition rate,10.4ps pulse width,0.38nJ pulse energy; themode-locking pulse with a73.5MHz fundamental repetition rate,13.7ps pulse width, and theQ-switched mode-locking pulse with a562kHz repetition rate,30nJ pulse energy; thetwo-soliton bound mode-locking pulse with a117MHz fundamental repetition rate have beenobtained respectively.(4) In the research of all-normal-dispersion nonlinear polarization evolution fiber laser,we further optimized the configuration of all-fiber nonlinear polarization evolutionmode-locking laser. Respectively, the202MHz fundamental repetition rate with2.12ps pulsewidth, the261MHz fundamental repetition rate with2.06ps pulse width neartransform-limited high-repetition-rate pulse laser has been obtained.