Gain dynamics in a soft-X-ray laser amplifier perturbed by a strong injected X-ray field

Wang, Y.; Wang, S.; Oliva, Eduardo; Li, L.; Berrill, M.; Yin, Lei; Nejdl, J.; Luther, B. M.; Proux, C; Le, T. T. T.; Dunn, James P.; Ros, D.; Zeitoun, Ph.; Rocca, J. J.

doi:10.1038/nphoton.2014.79

Cited by 28 publications

(13 citation statements)

References 28 publications

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“…In this work, we suggest a technique for amplification of a train of attosecond pulses, produced by HHG, in active medium of a plasma-based X-ray laser [33][34][35][36][37][38][39][40][41][42] in the presence of a strong co-propagating IR laser field. An amplification of a single high-order harmonic by the plasma-based X-ray laser has been widely studied before [36][37][38][40][41][42]. But narrow linewidths of X-ray lasers did not allow for joint amplification of several harmonics.…”

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confidence: 99%

Attosecond Pulse Amplification in a Plasma-Based X-Ray Laser Dressed by an Infrared Laser Field

et al. 2019

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We suggest a technique to amplify a train of attosecond pulses, produced by high-harmonic generation (HHG) of an infrared (IR) laser field, in an active medium of a plasma-based X-ray laser. This technique is based on modulation of transition frequency of the X-ray laser by the same IR field, as used to generate the harmonics, via linear Stark effect, which results in redistribution of the resonant gain and simultaneous amplification of a wide set of harmonics in the incident field. We propose an experimental implementation of the suggested technique in active medium of C 5+ ions at wavelength 3.4 nm in the "water window" range and show the possibility to amplify by two orders of magnitude a train of attosecond pulses with pulse duration down to 100 as. We show also a possibility to isolate a single attosecond pulse from the incident attosecond pulse train during its amplification in optically deep modulated medium. Abstract:In this supplemental material we derive an analytical solution describing an amplification of the highharmonic field in an active medium of a plasma-based X-ray laser in the linear regime within the three-level medium model and constant population inversion approximation. We provide also more detailed numerical study of an amplification process in both linear and nonlinear regimes taking into account a saturation effect within the fivelevel medium model.

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confidence: 99%

Attosecond Pulse Amplification in a Plasma-Based X-Ray Laser Dressed by an Infrared Laser Field

et al. 2019

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“…In a direct seeded amplifier scheme, the gain lifetime shall be shorter than the gain recovery lifetime, in order for the stored energy to be transferred only to the seed. In a similar type of seeded plasma x-ray laser experiment [9], the recovery time was measured to be about 2ps. In another experiment reported in [12], using two XRL targets in a master-amplifier configuration, the lifetime of the transient gain in a Ni-like silver medium was determined to be within the range of 3ps.…”

Section: Resultsmentioning

confidence: 99%

“…The enhanced plasma control and the high gain of the 1L2S scheme makes it very attractive for operation as amplifier. Amplification in plasma was first reported in [5] and subsequently addressed in seminal papers such as [6][7][8][9], as they promise higher energy, full coherence, short pulses and polarization control. In order to produce the optimal amplification, the seed spatial extent and the seed pulse duration shall match the ones of the amplifier.…”

Section: Introductionmentioning

confidence: 99%

One long and two short pumping pulses control for plasma x-ray amplifier optimization

Cojocaru¹,

Ungureanu²,

Banici³

et al. 2016

Opt. Express

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Development of efficient soft x-ray laser plasma amplifiers adapted to seeded operation, requires a better control over amplifier transverse spatial extent, brilliance control and gain lifetime. Here it is shown that pumping the plasma amplifier with one long and two short pump pulses (1L2S) provides advantages in terms of control for the specified parameters in the case of Ni-like Ag x-ray laser. Also, significant tunability of the gain lifetime in the 1L2S pumping scheme for Ne-like Ti x-ray laser is observed. Direct harmonics seeding and chirped harmonics seeding amplification approaches may benefit from the control of the gain lifetime, in terms of better use of the pump energy and as a way to reduce the amplified spontaneous emission in x-ray lasers.

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“…According to the Wiener -Khinchin theorem, this quantity can be obtained from the Fourier transformation of the field correlation function. Using the same normalization as for the intensity (20) and expressing the field correlation function in terms of atomic variables, we find:…”

Section: Field Correlation Function and Spectral Intensitymentioning

confidence: 99%

“…This conclusion was further supported by numerical calculation of the ratio between (C9) and the estimate of (C10). Another way of checking it is to calculate the intensity directly from atomic variables (20) and alternatively from the field correlation function I (a) (τ ) = G (a) (τ, τ ). In the first case, no approximation with regard to (C10) is made and its results agree with the approximate method.…”

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confidence: 99%

Quantum theory of superfluorescence based on two-point correlation functions

2019

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Irradiation of a medium by short intense pulses from x-ray / XUV free electron lasers can result in saturated photoionization of inner electronic shells. As a result an inversion of populations between core levels appears. The resulting fluorescent radiation can be amplified during its propagation through the inverted medium and results in intense, quasi transform-limited radiation bursts.While the optical counterpart of this phenomena, known as superfluorescence, was intensively investigated, a generalized treatment is needed in the x-ray / XUV domain, where the dynamics of pumping and evolution due to fast decay processes play a crucial role. To provide a general theoretical approach, we start from the fundamental, quantized minimal coupling Hamiltonian of light-matter interaction and after a series of approximations arrive at a closed system of equations for the two-point correlation function of atomic coherences and the two-time correlation function of the emitted field. The obtained formalism enables us to investigate collective spontaneous emission in various regimes. It is extended consistently to include incoherent processes that are relevant in the x-ray / XUV domain. These processes are introduced into the formalism by corresponding Lindblad superoperators. The connection to other approaches is discussed and numerical examples related to recent experiments are presented.

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Gain dynamics in a soft-X-ray laser amplifier perturbed by a strong injected X-ray field

Cited by 28 publications

References 28 publications

Attosecond Pulse Amplification in a Plasma-Based X-Ray Laser Dressed by an Infrared Laser Field

Attosecond Pulse Amplification in a Plasma-Based X-Ray Laser Dressed by an Infrared Laser Field

One long and two short pumping pulses control for plasma x-ray amplifier optimization

Quantum theory of superfluorescence based on two-point correlation functions

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