Research On Passively Mode-locked Picosecond Self-Raman Lasers With Saturable Absorber

’:Stimulated Raman scattering is a kind of efficiency nonlinear optical frequency conversion technology, which can generate many new wavelengths as the abundant scattering bandwidth of Raman crystal. The all-solid-state self-Raman laser use only one crystal both as laser and Raman medium with the self-Stimulated, which has become the the research focus of the Raman laser for the virtue of small-scale, compact and low power dissipation.1.17μm self-Raman laser can be a potential light source in many fields, such as ecological monitoring techniques, medical applications, light detection and ranging, nonlinear optical transformation, wind scanner, geo-seismic sensing for oil&gas, etc.In this thesis the author research on the passively mode-locked picosecond self-Raman lasers and their basic experiment with saturable absorber. Different picosecond self-Raman laser cavity were designed, the first-order self-stimulated laser and external-cavity second harmonic generation yellow laser were demonstrated.Firstly, the picosecond high power laser under passively CW mode-locked with SESAM were studied, as the basic experiment of piconsecond CW mode-locked self-Raman laser, through the optimization design, single-end-pumped high power Nd:GdVO41063nm laser were demonstrated. With an incident pump power of42W, the average output power, the repetition rate, the slope efficiency were15.22W,62MHz,41%, respectively.Secondly, the picosecond self-Raman laser under passively CW mode-locked with SESAM was studied, a novel design of cavity was designed, the CW mode-locked self-Raman1.17μm Nd:GdVO4laser were realized. With an incident pump power of10W, the average output powers was up to103mW at a repetition rate of145MHz.Thirdly, the picosecond high repetition laser under passively Q-switched mode-locked with Cr:YAG were studied, as the basic experiment of piconsecond Q-switched mode-locked self-Raman laser, through the optimization design, high repetition Q-switched mode-locked Nd:GdVO41063nm laser were observed. With an incident pump power of15W, the average output power, the repetition rate, the slope efficiency were1.83W,2.4GHz,14%, respectively.Fourthly, the picosecond self-Raman laser under passively Q-switched mode-locked with Cr:YAG was studied, the Q-switched mode-locked mode-locked self-Raman1.17Nd:GdVO4laser were obtained. Under the15%of OC,75mm of cavity length, with an incident pump power of8W, the average output power, the repetition rate, the slope efficiency, were66mW,1.7GHz,16.7%, respectively. And the power of external-cavity SHG yellow laser was4.98mW.