Novel Ultra-short Pulse Mode-locked Fiber Laser

Ultra-short pulse mode-locked fiber laser finds significant applications in many areas,such as bio-optics, nonlinear optics, optical information processing, industrial manufacturing,military security, high-speed optical communications, and so on. As the expansion ofapplication fields and detailed research, the development of ultra-short pulse mode-lockedfiber lasers have new trends. Focusing on novel ultra-short pulse mode-locked fiber lasers, wecarried out theoretical and experimental research.1. We described the development of ultra-short pulse fiber lasers, analyzed thedevelopment trends of mode-locked fiber laser, and introduced its basic configuration,physical mechanism and the main mode-locking techniques.2. Experimental study of high repetition rate all-fiber mode-locking fiber laserwas carried out，using the high gain Er/Yb co-doped phosphate glass fiber as gain medium,we established nonlinear polarization evolution mode-locking laser and achieved fs pulse witha fundamental repetition rate of220MHz and a duration time of245fs; And bound-soliton wasalso achieved. On this basis, we further optimized the configuration, established a morecompact all-fiber laser, and obtained89fs pulse with a500MHz fundamental repetition rate.The fluctuation of the output power is within±0.2%.3. For the problem that traditional soliton only obtained low energy and was easy to split,normal-dispersion-cavity mode-locked fibe laser was studied. Numerical simulation relatedwas given, by using the pulse trace model together with coupled complex nonlinearSchr dinger equations. Based on nonlinear polarization evolution technique, dissipativesoliton with rectangular spectral profiles was achieved in normal-dispersion-cavity Er/Ybco-doped fiber Laser，and its characteristics was investigated. Normal-dispersion-cavitymode-locked fiber laser was established and achieved fs pulse with206MHz fundamentalrepetition rate,103fs duration time and0.17nJ pulse energy. The laser could maintain steadysingle pulse operation under high power condition.