中文摘要：

对波长355 nm,脉宽5 ns的激光脉冲烧蚀空气中光学玻璃产生的等离子体发射光谱进行了时间和空间分辨研究。结果表明,在等离子体羽膨胀初期（小于200 ns时间范围内）,等离子体发射光谱主要由连续光谱构成。此后,连续光谱强度逐渐减弱,线状光谱开始占主导地位。实验表明,由于存在等离子体屏蔽效应,脉冲能量大于35 mJ后,光谱线强度开始减弱。由时间分辨发射光谱发现,在等离子体羽膨胀过程中等离子体辐射波长（以Si I390.6 nm为例）存在红移现象,波长红移量随时间演化呈二次指数衰减。

英文摘要：

The time and space resolved optical emission spectroscopy（OES） of optical glass plasma produced by nanosecond laser pulse（wavelength of 355 nm and pulse width of 5 ns） in air are investigated in this paper.Results show that OES is mainly consisted of continuous spectrum at the early stage of plasma expansion（within the first 200 ns） and the continuous spectrum weakens gradually while the line spectrum becomes dominating.The spectral intensity decreases when the ablated pulse energy increases more than 35 mJ for the existence of the plasma shielding.The wavelength red-shift of Si I 390.6 nm,which has a second order exponential decay with delay time,has been found based on the time-resolved emission spectroscopy.