飞秒激光激发水线产生太赫兹辐射的研究

Research on Terahertz radiation generated by femtosecond laser-excited water line

为了进一步探究飞秒激光激发水线产生太赫兹辐射的影响因素,通过实验研究了激光功率、激光焦点在水线中的位置及水线温度等因素对太赫兹辐射功率的影响。实验结果表明:随着激光功率的升高,太赫兹辐射功率也相应增加,但转换效率却在降低;相较于水线中心,水线边缘的太赫兹波辐射功率更高;同时,随着水线温度的升高,水线中心的太赫兹波辐射功率也随之升高。此外,通过建立水线与邻近空气域的二维平面模型,并对太赫兹电场强度的分布情况进行计算,发现随着太赫兹波频率的增大,辐射至空气中的太赫兹波电场强度也相应增强。

To further investigate the influencing factors of Terahertz radiation generated by femtosecond laser-excited water lines,experiments are conducted to study the effects of laser power,the position of the laser focus within the water line,and water line temperature on the Terahertz radiation power.The experimental results indicate that as the laser power increases,the Terahertz radiation power also increases accordingly,but the conversion efficiency decreases.Compared to the center of the water line,the Terahertz wave radiation power is higher at the edges of the water line.Additionally,as the temperature of the water line increas-es,the Terahertz wave radiation power at the center of the water line also rises.Furthermore,by establishing a two-dimensional plane model of the water line and the adjacent air domain and calculating the distribution of Terahertz electric field intensity,it is found that as the frequency of the Terahertz wave increases,the electric field intensity of the Terahertz wave radiated into the air also increases accordingly.