Grating eliminated no-nonsense observation of ultrafast incident laser light e-fields is an experimental technique for the full characterization of ultrashort laser pulses. It requires the nonlinear conversion of broadband ultrashort optical pulses into their second harmonic generation (SHG) that is relatively tightly focused on a thick SHG crystal. In this paper, the laser focusing problem is experimentally presented and demonstrated in the measurements of 780 nm chirped pulses emitted from a Ti:sapphire oscillator. In this experimental study, it has been shown how the focusing effect can cause distortions in the trace of the chirped pulses. It is demonstrated that the measurement of broadband pulses requires that the beam have a wide angular divergence. Therefore, a tight focusing is essential. A long focal length leads to a smaller range of angles incident on the crystal causing an insufficient divergence angle. Finally, the ability of this device in the characterization of d...

中文翻译：

---

在简化设备中表征超短chi脉冲的实验重点

光栅消除了对超快入射激光电场的无干扰观察，是一种用于超短激光脉冲的完整表征的实验技术。它要求将宽带超短光脉冲非线性转换为二次谐波（SHG），后者相对紧密地集中在厚SHG晶体上。在本文中，通过实验提出了激光聚焦问题，并在测量Ti：蓝宝石振荡器发出的780 nm chi脉冲时进行了演示。在这项实验研究中，已经显示出聚焦效应如何导致cause脉冲的轨迹失真。事实证明，宽带脉冲的测量要求光束具有宽的角度发散角。因此，严格聚焦至关重要。长焦距导致入射在晶体上的角度范围变小，从而导致发散角不足。最后，该器件具有表征电容器的能力。