首页> 中文期刊> 《材料导报》 >基于外加热激励源的中红外激光辐照VO2薄膜温升研究

基于外加热激励源的中红外激光辐照VO2薄膜温升研究

         

摘要

VO2薄膜在中红外激光防护领域有着重要意义.为研究中红外激光辐照VO2薄膜的温升累积效应及克服中红外激光器功率过小的困难,设计了一种外加热激励源的实验方法.首先利用ANSYS软件对中红外纳秒脉冲激光在不同激励源温度和不同功率密度下辐照VO2薄膜的温升累积进行仿真,并做了实际验证.研究发现,随着外加激励温度的升高,可在一定时间(100 s)内达到VO2相变温度的激光功率密度逐渐减小,通过增加功率密度,也可以进一步降低相变所需的激励源温度.两者均提高了VO2薄膜的温升速率.然后在激励源温度为40℃ 、中红外激光功率密度为1 W/mm2的条件下研究了中红外纳秒脉冲激光参数对VO2薄膜的温升累积效应,结果表明,增加激光脉宽、增加重频或光斑半径均能有效增加VO2薄膜的温升速率.%The VO2 thin film has shown a great significance in the field of mid-infrared laser protection .To research the cumu-lative effects of temperature rise of VO2 thin films under the irradiation of mid-infrared laser and to overcome the low power difficul-ty ,a kind of external heat source method was designed .At first ,the temperature accumulation of VO2 thin film under mid-infrared nanosecond pulse laser irradiation at different temperature of external heat source and different power density was simulated by ANSYS software and verified in practice .It was shown that the laser power density ,which could induce phase transition temperature within a certain time (100 s) ,decreased gradually with the increase of external heat source temperature .The essential temperature could be also reduced by increasing laser power density .And both of them could improve the temperature rising rate of VO2 thin films .Then the temperature accumulation effect of VO2 thin films irradiated by different mid-infrared nanosecond pulse laser parame-ters under the condition of 40 ℃ external heat source temperature and 1 W/mm2 infrared laser power density was researched .The results showed that expanding laser pulse width ,increasing repetition frequency and increasing facula radius could effectively increase the temperature rising rate of VO2 thin films .

著录项

  • 来源
    《材料导报》 |2017年第24期|91-95|共5页
  • 作者单位

    解放军电子工程学院 ,合肥230037;

    红外与低温等离子体安徽省重点实验室 ,合肥230037;

    脉冲功率激光技术国家重点实验室 ,合肥230037;

    解放军电子工程学院 ,合肥230037;

    红外与低温等离子体安徽省重点实验室 ,合肥230037;

    脉冲功率激光技术国家重点实验室 ,合肥230037;

    解放军电子工程学院 ,合肥230037;

    红外与低温等离子体安徽省重点实验室 ,合肥230037;

    脉冲功率激光技术国家重点实验室 ,合肥230037;

    解放军电子工程学院 ,合肥230037;

    红外与低温等离子体安徽省重点实验室 ,合肥230037;

    脉冲功率激光技术国家重点实验室 ,合肥230037;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 无机质材料;
  • 关键词

    VO2; 薄膜; 中红外纳秒脉冲激光; 外加热激励源; 温升累积效应;

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