Theoretical and Experimental Study of High-Peak-Power High-Brightness Quasi-CW Fiber Laser

The main factors limiting the power scaling of high-peak-power high-brightness quasi-continuous wave (QCW) fiber laser oscillator and a possible solution are analyzed in this paper. impacts length grating parameters on output studied by rate equations. Under optimized parameters, QCW with peak 7.3 kW is presented experimentally using 24 meter long spindle-shaped Yb-doped constant core cladding ratio, that best performance brightness near-single-mode lasers at present to our knowledge. corresponding pulse energy 0.57 J beam quality M2 factor about 1.43 under condition repetition frequency 1 kHz width 100 ?s. details analyzed, also further scaling, strategies suppressing nonlinear effects principle optical device parameter optimization.