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结合短脉冲光参量放大抽运源的需求,基于固体放大技术,对光纤锁模激光器输出的6nm带宽皮秒纳焦耳级激光脉冲进行放大,获得了6.2mJ的基频以及3.0mJ的倍频输出,输出脉冲的时间宽度为8.6ps,倍频光峰值功率密度为4.94GW/cm2。采用高增益的Nd3+…YLF再生放大器做前级放大器,利用其光谱增益窄化效应获得窄带的高功率光参量放大抽运光。理论计算表明,在此增益条件下,输出激光的光谱将被窄化至0.3nm。采取了合理的空间整形方案,输出激光的近场呈平顶分布,光束质量优良。再生放大器采用钢棒结构,降低温度变化对系统稳定性的影响,总能量输出稳定性优于1%(RMS)。
Based on the solid amplification technology, a 6 nm bandwidth picosecond nanosecond laser pulse output from a fiber mode-locked laser was amplified by combining the short-pulse optical parameters to amplify the pumping source. The fundamental frequency of 6.2 mJ and the multiplier of 3.0 mJ were obtained , The time width of the output pulse is 8.6 ps, and the peak power density of the frequency doubling light is 4.94 GW / cm2. The high-gain Nd3 + ... YLF regenerative amplifier is used as a preamplifier, and its narrowband high-power optical parameter is used to amplify the pump light with its narrow spectral gain effect. Theoretical calculations show that at this gain, the output laser spectrum will be narrowed to 0.3nm. Adopted a reasonable space shaping program, the output laser near-field flat-topped distribution, excellent beam quality. Regenerative amplifier with steel bar structure, reducing the temperature stability of the system changes, the total energy output stability of better than 1% (RMS).