A state diagnosis of laser-produced plasma in air generated by a 1064 nm pulse laser was investigated by the Thomson scattering (TS) method. The evolutions of the electron temperature and electron density were obtained as a function of the time delay which ranged from 300–3200 ns. The heating effect produced by the 532 nm probe beam with different energies on the air plasma at different interaction times was further studied using a time-resolved optical emission spectroscopy technique. The influence of the probe beam on the electron density was found to be negligible, whereas its influence on electron temperature is evident. In addition, the heating effect of the probe beam on the plasma strongly depends on the energy of the probe beam, and gradually weakens with increasing time delay. Our results are helpful for further understanding the TS method and its application in plasma diagnostics.

中文翻译：

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加热效应对空气中激光产生等离子体的汤姆森散射诊断的影响

通过Thomson散射（TS）方法研究了由1064 nm脉冲激光产生的空气中激光产生的等离子体的状态诊断。电子温度和电子密度的变化随时间延迟的变化而变化，时间延迟范围为300-3200 ns。使用时间分辨光发射光谱技术，进一步研究了在不同的相互作用时间下，具有不同能量的532 nm探测光束对空气等离子体产生的热效应。发现探测束对电子密度的影响可以忽略，而其对电子温度的影响是明显的。另外，探测束对等离子体的加热效果强烈取决于探测束的能量，并且随着时间延迟的增加而逐渐减弱。