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在1000 Hz高重复频率条件下,对单一大口径锥度光纤相位共轭镜(PCM)进行了详细的实验研究。对采用普通红宝石切割刀和进口LDC-200光纤切割刀切割的锥度光纤受激布里渊散射(SBS)反射率进行了比较,结果表明光纤表面切割好坏对反射率提升具有重要的影响。在两种抽运脉宽24 ns和15 ns下,对均由LDC-200光纤切割刀切割的锥度光纤SBS反射率进行了比较,在同样注入近40 mJ时,分别得到最高70%和50%的反射率。对抽运脉冲宽度为15 ns时,应用该锥度光纤PCM的双通输出激光能量、脉冲宽度、光束质量变化情况进行了测量,得到42 mJ,脉宽约1.5 ns的双通输出,光束质量得到明显改善。
A single large-aperture taper fiber phase conjugate mirror (PCM) was studied in detail at a high repetition rate of 1000 Hz. A comparison of the SBS reflectance of taper fiber cut with ordinary ruby cutter and imported LDC-200 fiber cutter shows that the cutting of the fiber surface has an important influence on the reflectivity. The reflectivity of the tapered optical fiber, both of which were cut by the LDC-200 fiber cutter, was compared at 24 ns and 15 ns with two pump pulse widths, up to 70% and 50%, respectively, The reflectivity. When the pump pulse width is 15 ns, the output laser power, pulse width and beam quality of the taper fiber PCM are measured to obtain a 42 mJ double-pass output with a pulse width of 1.5 ns. The beam quality is obtained Significant improvement.