Pálfalvi L, Ollmann Z, Tokodi L, Hebling J
Opt Express. 2016 Apr 18;24(8):8156-69. doi: 10.1364/OE.24.008156.
Conception of a hybrid type tilted-pulse-front pumping scheme for the generation of high-energy terahertz pulses is presented. The proposed setup is the combination of the conventional setup containing imaging optics and the contact grating. The solution was developed for nonlinear materials requiring large pulse-front-tilt angle, like LiNbO. Due to the creation of the pulse-front-tilt in two steps the limitations of imaging errors can be significantly reduced. Furthermore the necessary grating constant of the contact grating can be larger compared to the simple contact grating scheme making possible the fabrication of the grating profile with significantly higher precision. A detailed optimization procedure with respect to the diffraction efficiency on the contact grating is given for LiNbO. Instructions are also given how to construct the geometry of the setup in order to minimize imaging errors. Examples are given for LiNbO based practically realizable, optimized schemes with reduced imaging errors and high diffraction efficiency on the contact grating.
提出了一种用于产生高能太赫兹脉冲的混合型倾斜脉冲前沿泵浦方案的构想。所提出的装置是包含成像光学器件和接触光栅的传统装置的组合。该解决方案是针对像铌酸锂这样需要大脉冲前沿倾斜角的非线性材料开发的。由于分两步产生脉冲前沿倾斜，成像误差的限制可以显著降低。此外，与简单的接触光栅方案相比，接触光栅所需的光栅常数可以更大，从而使得能够以显著更高的精度制造光栅轮廓。给出了关于铌酸锂在接触光栅上的衍射效率的详细优化程序。还给出了如何构建装置的几何结构以最小化成像误差的说明。给出了基于铌酸锂的实际可行的、优化方案的示例，这些方案具有降低的成像误差和在接触光栅上的高衍射效率。
