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Nonlinear focusing of picosecond baseband pulses in paraelectric crystals

机译：顺电晶体中皮秒基带脉冲的非线性聚焦

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摘要

The nonlinear baseband electromagnetic pulses of a wide spectrum that lies in terahertz (THz) range are investigated theoretically in the paraelectric crystals like SrTiO3 at the temperatures similar to 77 K. The frequency dispersion is important in THz range there. The dominating nonlinearity of the crystal is cubic. The frequency dispersion and nonlinearity correspond to existence of envelope solitons and the modulation instability of long input envelope pulses, whereas in the transverse direction the modulation instability is absent. When the nonlinear wave is uniform in the transverse direction, the existence of soliton-like baseband pulses without a carrier frequency has been demonstrated. There exists a possibility to generate the regular sequences of short baseband pulses due to the nonlinearity in the paraelectric crystals. The nonlinear focusing of input long baseband pulses by the exciting antenna results in the formation of extremely short baseband pulses localized both in the longitudinal and transverse directions.
机译：理论上，在类似于77 K的温度下，在顺电晶体（如SrTiO3）中研究了处于太赫兹（THz）范围内的宽频谱非线性基带电磁脉冲。频率色散在THz范围内很重要。晶体的主要非线性是立方的。频率色散和非线性对应于包络孤子的存在和长输入包络脉冲的调制不稳定性，而在横向方向上则不存在调制不稳定性。当非线性波在横向上是均匀的时，已经证明存在没有载频的类孤子基带脉冲。由于顺电晶体的非线性，有可能产生短基带脉冲的规则序列。激励天线对输入的长基带脉冲进行非线性聚焦导致形成在纵向和横向上都非常短的基带脉冲。

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