高峰值功率脉冲激光与石英光纤耦合的空气击穿问题
Air breakdown in coupling area of high peak power laser pulse and silica optical fiber
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摘要: 研究了15 MW峰值功率脉冲激光与600 μm芯径石英光纤耦合中存在的空气击穿现象。对聚焦区域的空气击穿现象进行了理论和实验研究，测得空气击穿阈值为0.79×109 W/cm2。测得固体介质的激光损伤阈值为2.12×109 W/cm2，与理论计算结果相符。提出了七合一光纤耦合器用于解决空气击穿的办法，实验测得7根光纤并束的耦合效率为67.21%。结果表明光纤耦合器可有效解决15 MW峰值功率脉冲激光与600 μm芯径石英光纤的耦合。Abstract: The air breakdown in the coupling area of 15 MW laser pulse and 600 μm silica optical fiber is investigated. The air breakdown of the focal area is theoretically and experimentally researched. The air breakdown threshold is measured as 0.79×109 W/cm2。. The laser induced damage threshold of the solid medium is measured as 2.12×109 W/cm2。, which is consistent with the theory analyze. A sevenfiber coupler is presented to solve the air breakdown problem. The coupling efficiency of the seven fiber bundle tested is 67.21%. It is concluded that the sevenfiber coupler could couple 15 MW laser pulse into 600 μm silica optical fiber．
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Key words:
- high peak power laser /
- air breakdown /
- fiber coupling /
- coupling efficiency /
- fiber damage
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