Fig. 1. Schematic diagram of picosecond pulse seed

Fig. 1. Overall structure of MOPA system

Fig. 3. Picosecond pulse seed output results. (a) Fitting result with schematic diagram of pulse repetition rate shown in inset;

Fig. 4. Effects of different signal optical parameters on Raman suppression ratio of main amplification stage. (a) Spectra corresponding to different second-stage pre-amplification powers when output power of main amplification stage is 65 W; (b) when SRS rejection ratio is 30 dB, main amplification output powers correspond to different second-stage pre-amplification powers; (c) spectral broadening due to secondary pre-amplification followed by passive optical fiber; (d) when output power of main amplification stage is 65 W, output spectra of main amplification stage corresponding to different transmission fiber lengths with Raman spectrum at 1120 nm band shown in inset

Fig. 5. Output results of main amplification stage. (a) Output power of main amplification stage versus pump power; (b) spectrum when average output power is 103 W with output narrow spectrum shown in inset; (c) fitting result at output power of 103 W with output repetition rate shown in inset; (d) laser beam quality at maximum output power with beam profile at waist shown in inset