Ultra-short pulse fiber laser

The invention discloses an ultrashort pulse fiber laser. Comprising a non-linear amplification loop mirror which enables pulses which are oppositely transmitted in a loop to accumulate different phase shifts so as to form an intensity modulation mechanism for laser pulses in a cavity; the linear arm consists of an optical fiber device and a space optical element and is used for forming a resonant cavity and improving the self-mode-locking characteristic of the laser; and the output end is used for directly outputting the pulse. The ultrafast fiber laser provided by the invention is easy to package, good in mode-locked self-starting characteristic, not easy to damage the saturable absorber, high in laser damage threshold, small in size, simple and reliable in system and high in stability, and has the potential to be developed into a new generation of all-fiber ultrashort laser oscillators with excellent performance. 本发明公开了一种超短脉冲光纤激光器。包括：非线性放大环镜，使得环内相向传输的脉冲积累不同的相移，以便对腔内激光脉冲形成强度调制机制；由光纤器件与空间光学元件构成的线性臂，用于构成谐振腔，以及