Fülöp József András, Pálfalvi László, Hoffmann Matthias C, Hebling János
Department of Experimental Physics, University of Pécs, Ifjúság ú 6, 7624 Pécs, Hungary.
Opt Express. 2011 Aug 1;19(16):15090-7. doi: 10.1364/OE.19.015090.
Optical rectification of ultrashort laser pulses in LiNbO3 by tilted-pulse-front excitation is a powerful way to generate near single-cycle terahertz (THz) pulses. Calculations were carried out to optimize the output THz peak electric field strength. The results predict peak electric field strengths on the MV/cm level in the 0.3-1.5 THz frequency range by using optimal pump pulse duration of about 500 fs, optimal crystal length, and cryogenic temperatures for reducing THz absorption in LiNbO3. The THz electric field strength can be increased further to tens of MV/cm by focusing. Using optimal conditions together with the contact grating technique THz pulses with 100 MV/cm focused electric field strength and energies on the tens-of-mJ scale are feasible.
通过倾斜脉冲前沿激发在铌酸锂中对超短激光脉冲进行光学整流是产生近单周期太赫兹（THz）脉冲的一种有效方法。进行了计算以优化输出太赫兹峰值电场强度。结果预测，通过使用约500 fs的最佳泵浦脉冲持续时间、最佳晶体长度以及用于降低铌酸锂中太赫兹吸收的低温，在0.3 - 1.5 THz频率范围内峰值电场强度可达MV/cm级别。通过聚焦，太赫兹电场强度可进一步提高到数十MV/cm。结合最佳条件与接触光栅技术，产生聚焦电场强度为100 MV/cm且能量在数十mJ量级的太赫兹脉冲是可行的。
