We demonstrate an all polarization-maintaining (PM) fiber mode-locked laser seeded, hybrid fiber/solid-slab picosecond pulse laser system which outputs $40~\unicode[STIX]{x03BC}\text{J}$, 10 ps pulses at the central wavelength of 1064 nm. The beam quality factors $M^{2}$ in the unstable and stable directions are 1.35 and 1.31, respectively. $15~\unicode[STIX]{x03BC}\text{J}$ picosecond pulses at the central wavelength of 355 nm are generated through third harmonic generation (THG) by using two $\text{LiB}_{3}\text{O}_{5}$ (LBO) crystals, in order to get better processing efficiency on polycrystalline diamonds. The high pulse energy and beam quality of these ultraviolet (UV) picosecond pulses are confirmed by latter experiments of material processing on polycrystalline diamonds. This scheme which combines the advantages of the all PM fiber mode-locked laser and the solid-slab amplifier enables compact, robust and chirped pulse amplification-free amplification with high power picosecond pulses.

中文翻译：

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用于多晶金刚石材料加工的高脉冲能量光纤/固体板混合皮秒脉冲系统

我们展示了一种全保偏 (PM) 光纤锁模激光种子混合光纤/实心板皮秒脉冲激光系统，该系统输出$40~\unicode[STIX]{x03BC}\text{J}$，中心波长为 1064 nm 的 10 ps 脉冲。光束品质因数$M^{2}$在不稳定和稳定方向上分别为 1.35 和 1.31。$15~\unicode[STIX]{x03BC}\text{J}$中心波长为 355 nm 的皮秒脉冲通过三次谐波产生 (THG) 使用两个$\text{LiB}_{3}\text{O}_{5}$(LBO) 晶体，以便在多晶金刚石上获得更好的加工效率。这些紫外线 (UV) 皮秒脉冲的高脉冲能量和光束质量已通过多晶金刚石材料加工的后续实验得到证实。该方案结合了全保偏光纤锁模激光器和实心板放大器的优点，实现了紧凑、鲁棒和无啁啾脉冲放大的高功率皮秒脉冲放大。