Fig. 1. Development history of high power ultrafast fiber laser

Fig. 2. Structure diagram of passive mode-locked fiber laser

Fig. 3. Distribution of research results of passively mode locked fiber laser oscillators^[16-49]

Fig. 4. Diagram of high power ultrafast laser system

Fig. 5. Measured autocorrelation trace of the compressed pulses with and without fine adjusting of dispersion of CFBG at 10 μJ pulse energy^[68]

Fig. 6. Experimental results. (a) Pulse spectrum at the output of the amplifier; (b) autocorrelation trace of the amplifier pulses (inset: output beam profile) ^[71]

Fig. 7. Experimental simulation results. (a) Gaussian spectrum; (b) parabolic spectrum; phase-profiles of (c) Gaussian spectrum and (d) parabolic spectrum at power levels corresponding to B-integrals of 3.5 rad and 16 rad, respectively; corresponding autocorrelation traces of (e) Gaussian spectrum and (f) parabolic spectrum at power levels corresponding to B-integrals of 3.5 rad and 16 rad, respectively^[74]

Fig. 8. High-power ultra-fast laser output. (a) Full power spectrum of single channel before compression and combined beam before and after compression; (b) measured and calculated transform-limited (TFL) non-collinear intensity autocorrelation (inset: output stretched pulse shape of the main amplifier) ^[77]

Fig. 9. Schematic diagram of amplification technology. (a) Chirped pulse amplification; (b) divided pulse amplification; (c) pre-chirp managed amplification

Fig. 10. Schematic construction of the 10.4 kW fiber laser system ^[77]

Fig. 11. In recent years, high-power ultra-fast laser output parameters based on CPA, DPA, PCMA, and CPS technologies have been achieved. (a) Year-energy distribution diagram of 1 μm high-power ultrafast laser; (b) year-average power distribution diagram of 1 μm high-power ultrafast laser^{[80, 82-88, 90-112]}

Fig. 12. Structure diagram of CPA system with average output power of 830 W^[80]

Fig. 13. Experimental setup of DPA system ^[78]

Fig. 14. Schematic construction of the high power Yb-fiber PCMA system ^[117]

Fig. 15. Experimental setup of CPS system with output pulse energy of 10 mJ ^[112]

Fig. 16. Common nonlinear compression devices. (a) Multipass cell with quartz sheet; (b) multipass cell filled with noble gas