We demonstrate a method to simultaneously measure the rotational temperature and pump intensity in laser-induced molecular alignment by the time-resolved high harmonic spectroscopy (HHS). It relies on the sensitive dependence of the arising times of the local minima and maxima of the harmonic yields at the rotational revivals on the pump intensity and rotational temperature. By measuring the arising times of these local extrema from the time-resolved harmonic signals, the rotational temperature and pump intensity can be accurately measured. We have demonstrated our method using N₂ molecules. The validity and robustness of our method are tested with different harmonic orders and by changing the gas pressures as well as the distance between the gas exit and the optical axis. Moreover, we have also demonstrated the versatility of our method by applying it to CO₂ molecules.

中文翻译：

---

通过高次谐波产生，在分子比对实验中测量旋转温度和泵浦强度。

我们演示了一种通过时间分辨高谐波光谱（HHS）同时测量激光诱导的分子排列中的旋转温度和泵浦强度的方法。它依赖于泵转速和旋转温度在旋转恢复时的局部最小值和谐波产量的最大值的出现时间的敏感依赖性。通过从时间分辨谐波信号中测量这些局部极值的出现时间，可以精确地测量旋转温度和泵浦强度。我们已经证明了使用N _2的方法分子。我们的方法的有效性和鲁棒性通过不同的谐波次数并通过更改气压以及出气口与光轴之间的距离进行了测试。此外，我们还通过将其应用于CO ₂分子证明了我们方法的多功能性。