High energy single‐ to few‐cycle terahertz pulses enable the exploration of electron acceleration, strong‐field physics, and nonlinear terahertz spectroscopy. One important method of generating such terahertz pulses is using the tilted‐pulse‐front (TPF) technique. However, the needed angular dispersion leads to a spatial and temporal break‐up of the optical pump, reducing the generation efficiency and the electric field quality of the terahertz pulses. To decrease the effects caused by angular dispersion, multiple schemes with discrete pulse‐front‐tilt are suggested. Based on a 2D+1 numerical model, a systematic comparative study of the conventional TPF scheme, three discrete TPF schemes, and a scheme with spatio‐temporally chirped (STC) optical pulses is performed. Smaller optimal interaction lengths and conversion efficiencies are predicted compared to 1D models. For small pump beam sizes, it is concluded that the STC scheme delivers spatially homogeneous terahertz pulses with the highest conversion efficiency, and for short interaction lengths, the discrete TPF schemes cannot outperform the continuous ones. However, for large pump sizes, the nonlinear echelon slab delivers the spatially most homogeneous terahertz beams and has the unique potential of generating high energy terahertz pulses. In general, this work gives guidance to choose the most appropriate setup for a given terahertz experiment.

中文翻译：

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太赫兹生成的倾斜脉冲前方案

高能量的单周期至几周期太赫兹脉冲可以探索电子加速，强场物理学和非线性太赫兹光谱。产生这种太赫兹脉冲的一种重要方法是使用倾斜脉冲前（TPF）技术。但是，所需的角度色散会导致光泵的时空分裂，从而降低太赫兹脉冲的产生效率和电场质量。为了减少角度分散所造成的影响，建议使用具有离散脉冲前倾斜的多种方案。基于2D + 1数值模型，对常规TPF方案，三种离散TPF方案以及具有时空chi（STC）光脉冲的方案进行了系统的比较研究。与一维模型相比，可以预测到较小的最佳交互长度和转换效率。对于较小的泵浦光束，可以得出结论，STC方案可提供具有最高转换效率的空间均匀的太赫兹脉冲，并且对于较短的相互作用长度，离散的TPF方案不能胜过连续的TPF方案。但是，对于大型泵，非线性梯形平板可提供空间上最均匀的太赫兹光束，并具有产生高能量太赫兹脉冲的独特潜力。通常，这项工作为选择给定的太赫兹实验提供最合适的设置提供了指导。离散的TPF方案不能超过连续的方案。但是，对于大型泵，非线性梯形平板可提供空间上最均匀的太赫兹光束，并具有产生高能量太赫兹脉冲的独特潜力。通常，这项工作为选择给定的太赫兹实验提供了最合适的设置。离散的TPF方案不能超过连续的方案。但是，对于大型泵，非线性梯形平板可提供空间上最均匀的太赫兹光束，并具有产生高能量太赫兹脉冲的独特潜力。通常，这项工作为选择给定的太赫兹实验提供最合适的设置提供了指导。