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实验研究了芯径为600μm的全石英光纤传输脉宽为5 ns,波长为1064 nm的高峰值功率脉冲激光的传输特性。采用N-ON-1测试方法,获得光纤损伤阈值和光纤传能特性曲线。光纤50%概率损伤阈值为24 mJ,平均输出激光能量达到14 mJ,峰值功率接近3 MW。可将光纤传能特性曲线分为3个过程:未损伤段(平稳传输段)、光纤端面等离子体击穿段(非平稳传输段)和光纤体损伤段(传输截止段)。分析了光纤损伤形貌和损伤机理。研究表明,同时提高光纤端面等离子体击穿阈值和光纤初始输入段损伤阈值是提高光纤传能容量的关键。
The transmission characteristics of a high peak power pulsed laser with a pulse width of 5 ns and a wavelength of 1064 nm were investigated for a 600 μm-diameter all-silica optical fiber. Using N-ON-1 test method, fiber damage threshold and optical fiber transmission curve were obtained. The fiber 50% probability damage threshold is 24 mJ, the average output laser energy reaches 14 mJ, and the peak power approaches 3 MW. The fiber transmission characteristic curve can be divided into three processes: non-damaged section (smooth transmission section), fiber end face plasma breakdown section (non-stationary transmission section) and optical fiber body damage section (transmission cut-off section). The damage morphology and damage mechanism were analyzed. The research shows that it is the key to improve the transmission capacity of optical fiber to improve both the plasma breakdown threshold and the initial damage threshold of optical fiber at the same time.