Generation of Ultrashort Attosecond and Terahertz Pulses Based on the Collective Spontaneous Emission from a Thin Resonant Medium (Brief Review)

Unipolar pulses have a nonzero electric pulse area (integral of the electric field strength with respect of time in a given point of space). Due to unidirectional action on charges they can be an efficient tool for ultrafast control of wave packet dynamics in matter, charges acceleration and so one. In this paper, we briefly revise recent advances (including the results obtained by the authors) in optics of extremely-short unipolar half-cycle pulses.

Section: Unipolar Pulses and Their Properties In The Framework Of The...mentioning

confidence: 99%

“…Electric field changes its direction during the pulse duration. Their electric pulse area defined as [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] ⃗…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Half-cycle and unipolar pulses (Topical Review)

Архипов¹,

Архипов²,

Пахомов³

et al. 2022

“…In this regard, we note that a similar situation was considered in [30] when a terahertz signal was generated by the laser pulse with tilted wavefronts in the presence of multiphoton ionization. Note also that the nonlinear optics of unipolar pulses has been actively developing since the early 90s of the last century to the present day [4][5][6][31][32][33][34][35][36][37][38].…”

Section: Optical-terahertz Solitons With Tilted Wave Frontsmentioning

confidence: 99%

Soliton mode of terahertz radiation generation using picosecond laser pulses with tilted wave fronts

Сазонов

Ustinov

2022

The soliton-like mode for highly efficient generation of terahertz radiation in a quadratically nonlinear medium by means of optical pulses with tilted wave fronts is investigated. For optical and terahertz pulses, a system of the Zakharov–Boussinesq type equations describing the process of generation at arbitrary angles of the tilt of wave fronts is derived. Various cases of the soliton generation are analyzed. It is shown that the tilt of wave fronts is fundamental for the formation of the optical-terahertz solitons of a new type, which we call dispersionless solitons.

“…Currently, there is an intensive growth in the number of scientific publications related to nonlinear optics of unipolar pulses [8][9][10][11][12][13][14][15][16][17][18][19]. Such pulses contain only half of the period of electromagnetic oscillations.…”

Section: Introductionmentioning

confidence: 99%

Soliton-like unipolar objects in nonequilibrium dissipative media

Сазонов

2021

For electromagnetic pulses without a carrier frequency, propagating in a system of multilevel atoms with a fast irreversible relaxation of the induced dipole moment, but a slow relaxation of the populations of quantum states, the nonlinear integro-differential equations of the 'reaction-diffusion' type are derived. One-dimensional soliton-like solutions of these equations in the form of unipolar pulses are found and analyzed. It is shown that such pulses can be formed in a nonequilibrium medium. These pulses transfer a medium to other metastable states, which depend on the input conditions. The propagation of these soliton-like signals is accompanied by a change in the populations of quantum states of atoms in the modes of switching waves with the memory of input conditions.