The influence of plasma defocusing in high harmonic generation

Lai, Chien-Jen; Kärtner, Franz X.

doi:10.1364/oe.19.022377

Cited by 33 publications

(57 citation statements)

References 26 publications

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“…In the following we restrict our discussion on the gain given by Eq. (17). For recombination, if ∂ t χ qr < 0, the gain becomes positive comparable to stimulated emission processes.…”

Section: Solution For a Parametric Amplifiermentioning

confidence: 97%

“…Consequently, the collision distance and the electron trajectory should be well preserved within the medium during HHG. Because the electron trajectory changes with the Gouy phase ϕ g and atomic phase ϕ a [15][16][17], the sum of the two phases should remain nearly constant implying ∂ x (ϕ g + ϕ a ) ∼ = 0. This condition can be fulfilled if the HHG source is placed at a well-defined position within a focused laser beam and the source length L should be much shorter than the Rayleigh length x R of the focused beam, i.e., L x R .…”

Section: A Dependence Of the Gain Cross Section On The Parametric Rementioning

confidence: 99%

“…(13) and (14) plays a dominant role for the refractive index as given in Eq. (17), while the imaginary part describes the absorption or stimulated emission in the medium. In this section we will discuss the macroscopic buildup of the XUV signal in the presence of XPA whilst considering not only the gain, but also the dephasing between the driving laser and the XUV radiation.…”

Section: Gain and Phase Matchingmentioning

confidence: 99%

See 2 more Smart Citations

Classical model of strong-field parametric amplification of soft x rays

Seres

Spielmann

2012

Phys. Rev. A

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We present a detailed theoretical description of laser driven x-ray parametric amplification, which has been experimentally demonstrated by Seres et al. [Nature Phys. 6, 455 (2010)] together with a supporting basic model. The process is based on the parametric interaction of an x-ray photon with a laser accelerated electron in a Coulomb field. With the extended model we are able to estimate the gain cross section also for a finite energy distribution of the interacting electrons as well as to consider dephasing between the electrons and the x-ray field. The improved model is capable of describing the recent experimental findings much more accurately.

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“…In the following we restrict our discussion on the gain given by Eq. (17). For recombination, if ∂ t χ qr < 0, the gain becomes positive comparable to stimulated emission processes.…”

Section: Solution For a Parametric Amplifiermentioning

confidence: 97%

Section: A Dependence Of the Gain Cross Section On The Parametric Rementioning

confidence: 99%

Section: Gain and Phase Matchingmentioning

confidence: 99%

See 1 more Smart Citation

Classical model of strong-field parametric amplification of soft x rays

Seres

Spielmann

2012

Phys. Rev. A

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“…The single-atom response is calculated using the quantitative rescattering (QRS) model [25], and macroscopic propagation for both high harmonics and the driving laser field is obtained by solving three-dimensional Maxwell's equations [26]. The latter procedure has been applied to study plasma effect in high-harmonic generation in previous investigations also [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Spatially coherent high-order harmonics generated at optimal high gas pressure with high-intensity one- or two-color laser pulses

Jin

Lin

2016

Phys. Rev. A

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We investigate the gas-pressure dependence of macroscopic harmonic spectra generated in a high-ionization medium using intense 800-nm laser pulses. The harmonics obtained at the optimal pressure show good spatial coherence with small divergence (less than 2 mrad) in the far field. By analyzing the evolution of the laser's electric field as it propagates, we find that dynamic phase matching conditions are fulfilled in the second half of the gas cell and that harmonic yields do not depend on the position of the gas cell with respect to the focusing position. We also demonstrate that harmonic yields at the optimal pressure can be further enhanced by increasing input laser energy or by adding a few percent of second or third harmonic to the fundamental.

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“…Harmonic generation in plasma and semiconductors has been an area of significant interest for the past several decades [1][2][3][4][5][6][7][8][9][10]. Harmonic generation offers an alternative source for short wavelength generation and an important tool for diagnostics of nonlinear media.…”

Section: Introductionmentioning

confidence: 99%

Magnetic wiggler-assisted third-harmonic generation of a Gaussian laser pulse in plasma

Sharma¹,

Jaloree²,

Parashar³

2013

Turk J Phys

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Abstract:A Gaussian laser pulse propagating through plasma in the presence of a magnetic wiggler produces thirdharmonic radiation. The wiggler's magnetic field provides additional momentum required for phase matching. The required wiggler wave number is sensitive to pulse duration and amplitude. The efficiency of the process is significant at the instant at which the phase matching condition is satisfied.

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The influence of plasma defocusing in high harmonic generation

Cited by 33 publications

References 26 publications

Classical model of strong-field parametric amplification of soft x rays

Classical model of strong-field parametric amplification of soft x rays

Spatially coherent high-order harmonics generated at optimal high gas pressure with high-intensity one- or two-color laser pulses

Magnetic wiggler-assisted third-harmonic generation of a Gaussian laser pulse in plasma

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