Laser pulse reflection by anisotropic plasma

Vagin, K. Yu.; Uryupin, S. A.

doi:10.1016/j.physleta.2012.05.048

Cited by 11 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the study of the dispersion laws, for example, by registration of Raman scattering, opens up the possibility to obtain information on the evolution of the non-equilibrium distribution of photoelectrons. In turn, the presence of effectively developing instabilities allows us to count on additional opportunities for electromagnetic pulse amplification, similar to those revealed for the plasma formed during tunnel ionization of gas atoms (see, e.g., [30,33]). The excitation of the considered unstable modes during multiphoton ionization is due to plasma anisotropy caused by the presence of counter streams of photoelectrons along the strength vector of the linearly polarized ionizing field.…”

Section: Discussionmentioning

confidence: 88%

See 1 more Smart Citation

Collective modes of plasma formed by multiphoton ionization of rarefied gas

Vagin¹,

Uryupin²

2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

High-frequency collective modes in plasma with strongly anisotropic velocity distribution of photoelectrons formed by multiphoton or above-threshold ionization of gas atoms are studied. In the case of multiphoton ionization, along with the usual electromagnetic wave, there are two additional modes. In the region of large wavelengths, the higher-frequency mode is similar to the electron Langmuir wave. Its group velocity is mainly determined by the average photoelectron velocity, and Cherenkov damping is due to small velocity dispersion of photoelectron distribution. In the region of short waves, but with a small Cherenkov damping, the group and phase velocities of this wave are close to the average electron velocity. The second mode, which has lower frequency, in the region of wavelengths smaller than the ratio of average electron velocity to the plasma frequency, corresponds to quasi-potential wave. Its dispersion law is close to the linear one. In contrast, in the region of large wavelengths, this mode corresponds to aperiodic instability, the maximum growth rate of which is comparable to the plasma frequency. The distribution of photoelectrons formed during above-threshold ionization is characterized by the large number of energy peaks, which is accompanied by increasing in the number of collective modes. In particular, in plasma with photoelectron distribution which has two energy peaks, in addition to the electromagnetic mode four extra modes are possible. In the shortwave region, all four modes correspond to the waves that are damped due to Cherenkov interaction with photoelectrons. Two of these modes in the region of relatively long wavelengths are unstable. One of these unstable modes corresponds to quasi-potential wave whose amplitude aperiodically increases with time. The reason for the instabilities is the presence of counter streams of photoelectrons.

show abstract

Section: Discussionmentioning

confidence: 88%

“…A number of interesting predictions was also made for rarefied gases. There is a possibility of amplifying low-frequency radiation pulses in photoionized gas plasma [30,[33][34][35][36][37]. In addition, the longitudinal waves with a linear dispersion law corresponding to an electronic sound is possible in photoionized plasma [38,39].…”

Section: Introductionmentioning

confidence: 99%

Collective modes of plasma formed by multiphoton ionization of rarefied gas

Vagin¹,

Uryupin²

2020

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The anisotropy of photoelectron distribution function leads to new optical properties of photoionized plasma, [6,7] new properties of surface waves on the boundary of such plasma, [8] the possibility of aperiodic instability development, [9][10][11][12] and the amplification of low-frequency radiation. [13,14] Development of aperiodic instabilities is the reason for initial photoelectron distribution function destruction. [15] That is why such instabilities limit the existence time of unusual properties of photoionized plasma.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal electron waves in plasma formed at multi‐photon ionization of atoms by a short laser pulse

Vagin

Mamontova

Uryupin

2018

Contributions to Plasma Physics

Self Cite

View full text Add to dashboard Cite

The dispersion law and the collisionless damping decrement of high-frequency waves in a plasma formed as a result of multi-photon ionization of atoms by a laser pulse are found. Estimates indicating that such waves may exist in a weakly ionized xenon plasma are given. KEYWORDSdispersion law, multi-photon ionization, photoionized plasma, plasma waves 1 2 PHOTOELECTRONS DISTRIBUTION FUNCTIONWhen pulse duration is less or equal to the frequency of atom collisions, the multi-photon ionization of gases creates a photoelectron energy spectrum, which consists of peaks corresponding to the absorption of a certain number of photons. For example, this ionization mode is implemented for the xenon plasma created by an ultra-short excimer KrF laser pulse with photon energy ℏΩ = 5 eV and the radiation intensity ∼10 12 -10 13 W/cm 2 , corresponding to the moderately strong fields when

show abstract

Amplification of Electromagnetic Pulses by Photoionized Plasma

Vagin

Uryupin

2016

J Russ Laser Res

View full text Add to dashboard Cite

Laser pulse reflection by anisotropic plasma

Cited by 11 publications

References 14 publications

Collective modes of plasma formed by multiphoton ionization of rarefied gas

Collective modes of plasma formed by multiphoton ionization of rarefied gas

Longitudinal electron waves in plasma formed at multi‐photon ionization of atoms by a short laser pulse

Amplification of Electromagnetic Pulses by Photoionized Plasma

Contact Info

Product

Resources

About