Fig. 1. Fiber chirped pulse amplification system for a 4f femtosecond pulse shaping system based on a LC-SLM

Fig. 2. Target spectrum with different depression depths and different depression widths and actual modulated spectrum. (a) Target spectrum with different depression depths; (b) Actual spectrum with different depression depths; (c) Target spectrum with different depression widths; (d) Actual modulated spectrum with different depression widths

Fig. 3. Autocorrelation curves of the output before and after adjusting the seed spectrum with LC-SLM. (a) Original; (b) Modulated but without adjusting T-CFBG; (c) Mudulated with T-CFBG adjusted

Fig. 4. Variation trend of the transform-limited pulse duration and the compressed pulse duration corresponding to the output pulse spectrum of the output pulse spectrum with different concave central wavelengths

Fig. 5. Output results of different depression depths after amplified. (a) The output spectrum; (b) The trend of the transform-limited pulse duration and the compressed pulse duration (The inset is a comparison of the output autocorrelation curve after amplification of 0% and 90% of the depression depth)

Fig. 6. Output results of different depression widths after amplified. (a) The output spectrum; (b) The transform-limited pulse duration and the compression pulse duration (The inset is a comparison of the output autocorrelation curve after amplification of 0.003 and 0.005 of the depression width)

Fig. 7. Trend of pulse duration with depression width and depression depth at different powers. (a) The trend of output pulse duration with depression depth; (b) The trend of the transform-limited pulse duration of the output spectrum as a function of the depression depth; (c) The trend of output pulse duration with different depression width; (d) The trend of the transform-limited pulse duration corresponding to the output spectrum with the depression width

Fig. 8. Output power of 25 W with the narrowest pulse duration. (a) Comparison of output spectrum before and after modulated; (b) Comparison of transform limit autocorrelation curves before and after modulated; (c) Comparison of actual compressed autocorrelation curves before and after modulated