The results of spectral diagnostics of an optical discharge (OD) plasma propagating through a hollow-core revolver fibre under the action of repetitively pulsed laser radiation are presented. The revolver fibre is made of silica glass, with a diameter of the hollow core being 20 μm. The peak values of the laser radiation intensity reach 10¹² W cm⁻²at an average Nd : YAG laser power of about 2 W. The time-averaged spectrum of the OD plasma in the visible range has the form of a continuum and is close to the blackbody spectrum with a temperature of 13.3 – 17 kK. The form of the spectrum does not depend on the gas filling of the fibre core (air or argon). In the UV part of the spectrum, lines of neutral silicon are observed, which are indicative of the partial evaporation of the reflecting cladding of the fibre.

介绍了在重复脉冲激光辐射作用下通过空心旋转光纤传播的光放电 (OD) 等离子体的光谱诊断结果。旋转光纤由石英玻璃制成，空心直径为20μm。激光辐射强度峰值达到10 ¹² W cm ^-2平均 Nd : YAG 激光功率约为 2 W。 OD 等离子体在可见光范围内的时间平均光谱具有连续谱形式，接近温度为 13.3 – 17 kK 的黑体光谱。光谱的形式不依赖于纤芯的气体填充（空气或氩气）。在光谱的紫外部分，观察到中性硅线，这表明光纤的反射包层部分蒸发。