Generation of waveform-tunable unipolar pulses in a nonlinear resonant medium

Tailoring the waveshape of optical unipolar pulses in a multi-level resonant medium

“…2 produced by different slices along the layer. As the result, such single-cycle pulses fully compensate each other leading to the nearzero field except for the very leading and the very trailing edges of the layer response, where the constructive interference of the half-cycles of the same polarity takes place [45]. The time delay between both unipolar bursts is proportional to the thickness of the medium layer.…”

“…Next, following the findings of Ref. [45] for Ramanactive media, we are interested to consider the emitted field from an extended layer with a spatially inhomogeneous density distribution along the layer thickness. This could be achieved, e.g.…”

“…The exact shape of the medium response can be analytically calculated using the approach from Ref. [45], where unipolar pulses of various waveforms were obtained from an optically thick layer of a Raman-active medium excited by a pair of multi-cycle bipolar pulses. The basic idea is to approximate the emitted field from a thin medium slice in Fig.…”

“…Unipolar THz pulses of more complex waveshapes were obtained upon coherent control of a Ramanactive medium in Ref. [45]. Experimental determination of the unipolarity of THz pulses was performed in Ref.…”

Сверхизлучение Импульса Остановленной Поляризации В Тонком Слое Пятиуровневой Среды, Возбуждаемой Субцикловыми Аттосекундными Импульсами

“…В работе [38] изучены особенности сверхизлучения ИОП, распространяющегося в протяженной резонасной среде и создаваемого парой полупериодных аттосекундных импульсов. Это может приводить к получению униполярных импульсов ТГц излучения прямоугольной или треугольной формы в неоднородной среде [39].…”