N $_2$、O $_2$和空气在中红外波段的线性和非线性极化率的从头计算
Ab-initio calculations of the linear and nonlinear susceptibilities of N$_2$, O$_2$, and air in the mid-infrared
摘要：
我们目前的第一性原理计算的线性和非线性极化率的N $_2$，O $_2$，和空气在中红外波长范围内，从$1-4$ $μ$ m。我们从含时密度泛函理论计算的全含时偶极矩中提取了含时极化率。我们发现很好的协议与曲线来自实验结果的线性极化率，并与测量的非线性极化率高达2.4 $μ$ m。我们还发现，即使在高达$5\times 10^{13}$ W/cm $^2$的强场区，双折射率对激光强度也不敏感。我们的结果将允许精确计算的长距离传输的强烈的MIR激光脉冲在空气中。
英文摘要：
We present first-principles calculations of the linear and nonlinear susceptibilities of N$_2$, O$_2$, and air in the mid-infrared wavelength regime, from $1-4$ $μ$m. We extract the frequency-dependent susceptibilities from the full time-dependent dipole moment that is calculated using time-dependent density functional theory. We find good agreement with curves derived from experimental results for the linear susceptibility, and with measurements for the nonlinear susceptibility up to 2.4 $μ$m. We also find that the susceptibilities are insensitive to the laser intensity even in the strong field regime up to $5\times 10^{13}$ W/cm$^2$. Our results will allow accurate calculations of the long-distance propagation of intense MIR laser pulses in air.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
