Chefonov O V, Ovchinnikov A V, Hauri C P, Agranat M B
Opt Express. 2019 Sep 16;27(19):27273-27281. doi: 10.1364/OE.27.027273.
A versatile table-top high-intense source of terahertz radiation, enabling to generate pulses of both broadband and narrowband spectra with a tunable frequency up to 3 THz is presented. The terahertz radiation pulses are generated by optical rectification of femtosecond pulses of Cr:forsterite laser setup in nonlinear organic crystal OH1. Electric field strengths of broadband and narrowband terahertz pulses were achieved close to 20 MV/cm and more than 2 MV/cm, correspondingly. Experiments on excitation of spin subsystem oscillations of an antiferromagnetic NiO were carried out. Selective excitation of 0.42 THz mode was observed for the first time at room temperature by a narrowband terahertz pulses tuned close to mode frequency.
本文介绍了一种多功能桌面式太赫兹辐射高强度源，它能够产生宽带和窄带光谱的脉冲，频率可调谐至3太赫兹。太赫兹辐射脉冲由Cr:镁橄榄石激光装置的飞秒脉冲在非线性有机晶体OH1中进行光学整流产生。宽带和窄带太赫兹脉冲的电场强度分别达到近20兆伏/厘米和超过2兆伏/厘米。开展了关于反铁磁NiO自旋子系统振荡激发的实验。首次在室温下通过调谐至接近模式频率的窄带太赫兹脉冲观察到0.42太赫兹模式的选择性激发。
