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基于傅里叶热传导方程,利用有限差分法计算了石英在激光作用下的温度场分布。结果表明在连续激光的作用下,石英的轴向温度变化分为升温过程和降温过程。考虑热累积效应,辐照0.1、0.5、0.8s后温度较之前分别升高了约10、100、200℃,激光作用时间越长,温度累积越明显。对于脉宽为5ms,占空比为1/2和1/3的脉冲激光,辐照3个脉冲后,温度分别升高94℃和82℃。石英在轴向方向的温度累积较径向更明显。研究激光与石英相互作用后温度场的分布对激光加工工艺有着重要的意义。
Based on the Fourier heat conduction equation, the temperature field distribution of quartz under laser irradiation was calculated by finite difference method. The results show that under the action of continuous laser, the axial temperature change of quartz is divided into heating process and cooling process. Considering the heat accumulation effect, the temperature was increased by about 10,100 and 200 ℃ respectively after 0.1, 0.5 and 0.8s irradiation. The longer the laser irradiation time, the more obvious the temperature accumulation. For the pulsed laser with pulse duration of 5ms and duty cycle of 1/2 and 1/3, the temperature increased by 94 ℃ and 82 ℃ after 3 pulses respectively. Quartz in the axial direction of the cumulative temperature more pronounced radial. Studying the distribution of temperature field after the interaction between laser and quartz has important significance for the laser processing technology.