有机晶体BNA中强近红外脉冲的光学整流产生太赫兹波

THz generation by optical rectification of intense near-infrared pulses in organic crystal BNA.

作者信息

Roeder F, Shalaby M, Beleites B, Ronneberger F, Gopal A

出版信息

Opt Express. 2020 Nov 23;28(24):36274-36285. doi: 10.1364/OE.404690.

Abstract

Generation of terahertz radiation by optical rectification of intense near-infrared laser pulses in N-benzyl-2-methyl-4-nitroaniline (BNA) is investigated in detail by carrying out a complete characterization of the terahertz radiation. We studied the scaling of THz yield with pump pulse repetition rate and fluence which enabled us to predict the optimal operating conditions for BNA crystals at room temperature for 800 nm pump wavelength. Furthermore, recording the transmitted laser spectrum allowed us to calculate the nonlinear refractive index of BNA at 800 nm.

摘要

通过对太赫兹辐射进行全面表征，详细研究了在N-苄基-2-甲基-4-硝基苯胺（BNA）中强近红外激光脉冲的光学整流产生太赫兹辐射的过程。我们研究了太赫兹产率随泵浦脉冲重复率和能量密度的变化规律，这使我们能够预测室温下800 nm泵浦波长时BNA晶体的最佳工作条件。此外，记录透射激光光谱使我们能够计算出800 nm处BNA的非线性折射率。