Dispersion occurs naturally in many wave systems. So far, a variety of techniques have been proposed and demonstrated to compensate the second-order (group-velocity) dispersion, such as dispersion management and nonlinear soliton formation, yet it is commonly believed that the first-order dispersion (FOD) is less amenable and cannot be eliminated. In this work, it is shown that a phase-invariant propagation of THz pulses, namely the “frozen-phase” propagation, can be realized by a complete cancellation of the FOD, achieved by implementing a synchronized THz moving source with a locked initial phase. The dynamic generation and propagation process of the THz pulses is examined directly by a time-resolved imaging system. To the best of authors' knowledge, this represents the first demonstration of the “frozen-phase” propagation of a light pulse in dispersive optical systems.

中文翻译：

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色散光学系统中太赫兹脉冲“冻结相”传播的观测

色散在许多波系统中​​自然发生。到目前为止，已经提出并证明了多种技术来补偿二阶（群速度）色散，例如色散管理和非线性孤子形成，但通常认为一阶色散（FOD）较小可以接受且无法消除。在这项工作中，表明太赫兹脉冲的相位不变传播，即“冻结相位”传播，可以通过完全消除 FOD 来实现，通过实现具有锁定初始相位的同步太赫兹移动源来实现. THz 脉冲的动态产生和传播过程由时间分辨成像系统直接检查。据作者所知，