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在光子晶体光纤飞秒激光放大系统中,利用液晶空间光调制器的调制特性,实现了对超短激光脉冲实时、可控的脉冲振幅整形,分析了大线性啁啾方波脉冲在放大过程中的频域和时域形状随泵浦功率的变化规律,在此基础上,通过液晶空间光调制器对主放大器前的脉冲频谱形状进行了预先调整,放大后获得了中心波长为1 031 nm,光谱宽度为13 nm,脉宽为15 ps的方波脉冲,证实了采用光谱优化后的飞秒脉冲作种子,可以较好地克服光子晶体光纤放大器增益不均引起的频谱形状的变化。
In the photonic crystal fiber femtosecond laser amplification system, the real-time and controllable pulse amplitude shaping of the ultra-short laser pulse is realized by using the modulation characteristics of the liquid crystal spatial light modulator, and the large linear chirped square wave pulse is analyzed in the amplification process The shape of the frequency domain and the time domain changes with the pump power. On this basis, the shape of the pulse spectrum before the main amplifier is adjusted by the liquid crystal spatial light modulator, and the center wavelength is obtained as 1 031 nm, Spectral width of 13 nm, pulse width of 15 ps square wave pulse, confirmed the use of spectrally optimized femtosecond pulse as a seed, you can better overcome the photonic crystal fiber amplifier gain uneven spectrum shape changes caused.