Research of Key Technology of Ultra-short Yb～(3+) Doped Fiber Amplifier

Research of Key Technology of Ultra-short Yb～(3+) Doped Fiber Amplifier
　　Ultrashort pulse technology and lanthanon-doped fiber laser have become twoimportant fields in optics in recent years. High peak-power ultrashort pulses have asignificant value in high-precision industrial laser processing applications, scientificresearch, medical technology and so on. As an attractive gain medium, the Yb3+-dopedfiber has some better quality magnet lifter compared to other lanthanon-doped fiber, such as highersaturable power, higher optical conversion efficiency and broader gain spectrumbandwidth(which can support pulses as short as 30fs). In this paper the Yb3+-dopedfiber chirped pulse amplifier system is studied experimentally and theoretically.Firstly, the development history, recent achievement and perspective ofYb3+-doped fiber laser are summarized.Secondly, through numerical simulation and experiments the properties of thefigure-of-eight passively mode-locked fiber laser and Yb3+-doped fiber amplifier arestudied, the optimization of the parameters of amplifier is discussed. By using anYb3+-doped large-mode-area photonic crystal fiber amplifier, 356ps pulses with 100uJenergy are gained, and the average power achieves 3.1W.Thirdly, the characters http://www.999magnet.com/ of gratings compressor are studied experimentally andtheoretically. The principle of the gratings compressor design is concluded byanalyzing the parameters of grating. Finally, through optimization of the parameters ofgratings compressor, 716fs pulses with 20uJ energy are obtained.