Nonlinear Terahertz Electromagnetic Waves in SrTiO3 Crystals under Focusing

V. Grimalsky, S. Koshevaya, J. Escobedo-Alatorre, M. Tecpoyotl-Torres
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引用次数: 8

Abstract

The nonlinear waves of terahertz (THz) range are investigated in the paraelectric crystals SrTiO3 at the temperatures ~77 K. The frequency dispersion is important there. In the absence of a bias electric field the dominating nonlinearity is cubic. The frequency dispersion and nonlinearity correspond to existence of envelope solitons and the modulation instability (MI) of long input pulses, whereas in the transverse direction MI is absent. There exists a possibility to generate the regular sequences of short THz pulses due to MI in bounded SrTiO3 crystals. The focusing of input long pulses reduces the threshold of MI, increases the output amplitudes of the short pulses, and provides more stable generation of the short pulses. It is investigated the frequency multiplication of THz electromagnetic radiation in bounded paraelectric SrTiO3 when a bias electric field is applied. The dominating nonlinearity is quadratic there. The frequency dispersion and the transverse width of the input wave beams affect the generation of higher harmonics. It is possible to select the certain numbers of higher harmonics by means of the optimum length of the crystal, by the width of the beam of the input first harmonic, and by the focusing of the input first harmonic.
聚焦下SrTiO3晶体中的非线性太赫兹电磁波
研究了SrTiO3准电晶体在~77 K温度下的太赫兹(THz)非线性波。频散在这里很重要。在没有偏置电场的情况下,主要非线性是三次的。频率色散和非线性对应于包络孤子的存在和长输入脉冲的调制不稳定性(MI),而在横向上不存在调制不稳定性。在有界SrTiO3晶体中存在由MI产生规则序列的短太赫兹脉冲的可能性。输入长脉冲的聚焦降低了MI的阈值,增加了短脉冲的输出幅度,使短脉冲的产生更加稳定。研究了施加偏置电场时,有界拟电SrTiO3中太赫兹电磁辐射的倍频特性。主要的非线性是二次的。输入波束的频散和横向宽度影响高次谐波的产生。可以通过晶体的最佳长度、输入第一谐波的光束宽度和输入第一谐波的聚焦来选择一定数量的高谐波。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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