The accuracy of estimating the duration of single-cycle laser pulses with centre wavelengths of 910 and 780 nm is analysed using a single-shot second-order intensity autocorrelator. It is shown that estimates of the single-cycle pulse duration with an error of less than 5% require the use of KDP crystals with a thickness of no more than 10 μm for the second harmonic generation. At the same time, to estimate the duration of a transform-limited pulse containing ten optical cycles, the crystal thickness can be up to 1 mm. In this case, at an optimum angle of convergence of the firstharmonic beams, the duration estimation error is less than 2%.

中文翻译：

---

使用单次二阶强度自相关器对超短激光脉冲的持续时间估计的准确性

使用单次二阶强度自相关器分析了估计中心波长为 910 和 780 nm 的单周期激光脉冲持续时间的准确性。结果表明，误差小于 5% 的单周期脉冲持续时间的估计需要使用厚度不超过 10 μm 的 KDP 晶体来产生二次谐波。同时，为了估计包含十个光学周期的变换限制脉冲的持续时间，晶体厚度可以达到 1 毫米。在这种情况下，在一次谐波光束的最佳会聚角下，持续时间估计误差小于 2%。