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首页> 外文会议>Damage to VUV, EUV, and X-ray optics III >Time resolved optical methods for investigation of phase transformations in materials exposed to nanosecond laser pulses
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Time resolved optical methods for investigation of phase transformations in materials exposed to nanosecond laser pulses

机译：时间分辨光学方法研究暴露于纳秒激光脉冲的材料中的相变

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摘要

Infrared (IR) radiometry and time resolved reflectivity (TRR) methods can be used for investigation of laser pulse effects on materials in nanosecond time scale. The methods in combination are capable to quantify object temperature and detect phase transformations in the solid state, melting and plasma formation from vapour. Measurements with different laser pulse energy densities provide threshold of the transformation. The melt duration can be also determined. The experimental system is described. It contains KrF excimer laser with homogenizer and variable attenuator, fast IR detector for radiometry, continuous probing laser with Si photodiode for reflectivity measurement and UV detector for pump laser pulse reflection measurement. The system was applied to investigation of responses to laser light of silicon and different pure metals and alloys. The range of energy densities used was 1-5500 mJ.cm-2 and measurements were done with temporal resolution of 6 ns for radiometry and 1 ns for reflectivity.
机译：红外（IR）辐射测定法和时间分辨反射率（TRR）方法可用于研究纳秒级时激光脉冲对材料的影响。结合使用的方法能够量化对象温度并检测固态的相变，蒸汽的熔化和等离子体的形成。使用不同的激光脉冲能量密度进行的测量提供了转换的阈值。熔化时间也可以确定。描述了实验系统。它包含带有均质器和可变衰减器的KrF准分子激光器，用于辐射测定的快速IR检测器，用于反射率测量的带有Si光电二极管的连续探测激光器以及用于泵浦激光脉冲反射测量的UV检测器。该系统被用于研究硅以及不同纯金属和合金对激光的响应。所使用的能量密度范围为1-5500 mJ.cm-2，并且以6 ns的辐射分辨率和1 ns的反射率的时间分辨率进行测量。

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