Abstract
An analysis of the self-focusing of highly intense chirped pulse laser under exponential plasma density ramp with higher order value of axial electron temperature has been done. Beam width parameter is derived by using paraxial ray approximation and then solved numerically. It is seen that self-focusing of chirped pulse laser is intensely affected by the higher order values of axial electron temperature. Further, influence of exponential plasma density ramp is studied and it is concluded that self-focusing of laser enhances and occurs earlier. On the other hand defocusing of beam reduces to the great extent. It is noticed that the laser spot size reduces significantly under joint influence of the density ramp and the axial electron temperature. Present analysis may be useful for the analysis of quantum dots, the laser induced fusion and etc.
-
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
-
Research funding: None declared.
-
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
References
[1] V. Thakur and N. Kant, “Stronger self-focusing of cosh-Gaussian laser beam under exponential density ramp in plasma with linear absorption,” Optik, vol. 183, pp. 912–917, 2019. https://doi.org/10.1016/j.ijleo.2019.03.005.Search in Google Scholar
[2] V. Thakur and N. Kant, “Stronger self-focusing of a chirped pulse laser with exponential density ramp profile in cold quantum magnetoplasma,” Optik, vol. 172, pp. 191–196, 2018. https://doi.org/10.1016/j.ijleo.2018.07.027.Search in Google Scholar
[3] N. Kant, D. N. Gupta, and H. Suk, “Generation of second harmonic radiations of a self-focusing laser from a plasma with density transition,” Phys. Lett. A, vol. 375, pp. 3134–3137, 2011. https://doi.org/10.1016/j.physleta.2011.06.062.Search in Google Scholar
[4] P. N. Guzdar, P. K. Chaturvedi, K. Papadopoulos, and S. L. Ossakow, “The thermal self‐focusing instability near the critical surface in the high‐flatitude ionosphere,” J. Geophys. Res., vol. 103, pp. 2231–2237, 1998. https://doi.org/10.1029/97JA03247.Search in Google Scholar
[5] N. A. Gondarenko, “Generation and evolution of density irregularities due to self‐focusing in ionospheric modifications,” J. Geophys. Res., vol. 110, 2005, Art no. A09304. https://doi.org/10.1029/2005JA011142.Search in Google Scholar
[6] S. P. Regan, D. K. Bradley, A. V. Chirokikh, R. S. Craxton, D. D. Meyerhofer, W. Seka, R. P. Drake, “Laser-plasma interactions in long-scale-length plasmas under direct-drive National Ignition Facility conditions,” Phys. Plasmas, vol. 6, pp. 2072–2080, 1999. https://doi.org/10.1063/1.873716.Search in Google Scholar
[7] F. Osman, R. Castillo, and H. Hora, “Relativistic and ponderomotive self‐focusing at laser–plasma interaction,” J. Plasma Phys., vol. 61, p. 263, 1999. https://doi.org/10.1017/S0022377898007417.Search in Google Scholar
[8] S. D. Patil, M. V. Takale, S. T. Navare, V. J. Fulari, and M. B. Dongare, “Relativistic self-focusing of cosh-Gaussian laser beams in a plasma,” Opt. Laser Technol., vol. 44, pp. 314–317, 2012. https://doi.org/10.1016/j.optlastec.2011.07.005.Search in Google Scholar
[9] H. Kumar, M. Aggarwal, R. Richa, and T. S. Gill, “Combined effect of relativistic and ponderomotive nonlinearity on self-focusing of Gaussian laser beam in a cold quantum plasma,” Laser Part. Beams, vol. 34, pp. 426–432, 2016. https://doi.org/10.1017/S0263034616000276.Search in Google Scholar
[10] S. D. Patil and M. V. Takale, “Weakly relativistic ponderomotive effects on self-focusing in the interaction of cosh-Gaussian laser beams with a plasma,” Laser Phys. Lett., vol. 10, 2013, Art no. 115402. https://doi.org/10.1088/1612-2011/10/11/115402.Search in Google Scholar
[11] S. D. Patil and M. V. Takale, “Response to “Comment on ‘Stationary self-focusing of Gaussian laser beam in relativistic thermal quantum plasma’”,” Phys. Plasmas, vol. 21, 2014, Art no. 064702. https://doi.org/10.1063/1.4878321.Search in Google Scholar
[12] M. Aggarwal, S. Vij, and N. Kant, “Propagation of cosh Gaussian laser beam in plasma with density ripple in relativistic – ponderomotive regime,” Optik, vol. 125, pp. 5081–5084, 2014. https://doi.org/10.1016/j.ijleo.2014.04.098.Search in Google Scholar
[13] N. Kant and V. Nanda, “Stronger self-focusing of Hermite cosh-Gaussian (HChG) laser beam in plasma,” OALib Journal, vol. 1, pp. 1–5, 2014. https://doi.org/201410.4236/oalib.1100681.10.4236/oalib.1100681Search in Google Scholar
[14] A. Singh and K. Walia, “Self-focusing of elliptical laser beam in collisional plasma and its effect on stimulated Brillouin scattering process,” J. Fusion Energy, vol. 31, pp. 531–537, 2012. https://doi.org/10.1007/s10894-011-9496-y.Search in Google Scholar
[15] P. Sati, A. K. Sharma, and V. K. Tripathi, “Self focusing of a quadruple Gaussian laser beam in a plasma,” Phys. Plasmas, vol. 19, 2012, Art no. 092117. https://doi.org/10.1063/1.4754696.Search in Google Scholar
[16] Y. Wang and Z. Zhou, “Propagation characters of Gaussian laser beams in collisionless plasma: effect of plasma temperature,” Phys. Plasmas, vol. 18, 2011, Art no. 043101. https://doi.org/10.1063/1.3575629.Search in Google Scholar
[17] S. Misra, M. S. Sodha, and S. K. Mishra, “Self-focusing of coaxial electromagnetic beams in a plasma with electron temperature dependent electron-ion recombination coefficient,” Opt. Commun., vol. 385, pp. 71–77, 2017. https://doi.org/10.1016/j.optcom.2016.10.02.Search in Google Scholar
[18] X. I. A. Xiong-Ping and Y. I. Lin, “Effect of higher order axial electron temperature on self-focusing of electromagnetic pulsed beam in collisional plasma,” Commun. Theor. Phys., vol. 57, pp. 873–878, 2012. https://doi.org/10.1088/0253-6102/57/5/19.Search in Google Scholar
[19] M. S. Sodha, A. K. Ghatak, and V. K. Tripathi, Self-focusing of Laser Beams, New Delhi, Tata McGraw-Hill Publishing Co. Ltd., 1974.Search in Google Scholar
[20] M. A. Wani, V. Thakur, H. S. Ghotra, and N. Kant, “Effect of axial electron temperature and plasma density ramp on self-focusing/defocusing of a laser beam in plasma,” Optik, vol. 192, 2019, Art no. 162963. https://doi.org/10.1016/j.ijleo.2019.162963.Search in Google Scholar
[21] M. Hashemzadeh, “Self-focusing and defocusing of Gaussian laser beams in collisional inhomogeneous plasmas with linear density and temperature ramps,” Phys. Plasmas, vol. 25, 2018, Art no. 012309. https://doi.org/10.1063/1.5007800.Search in Google Scholar
[22] A. Pukhov and J. Meyer-ter-Vehn, “Relativistic magnetic self-channeling of light in near-critical plasma: three-dimensional particle-in-cell simulation,” Phys. Rev. Lett., vol. 76, pp. 3975–3978, 1996. https://doi.org/10.1103/PhysRevLett.76.397.Search in Google Scholar
[23] T.S. Gill, R. Mahajan, and R. Kaur, “Self-focusing of cosh-Gaussian laser beam in a plasma with weakly relativistic and ponderomotive regime,” Phys. Plasmas, vol. 18, 2011, Art no. 033110. https://doi.org/10.1063/1.3570663.Search in Google Scholar
© 2020 Walter de Gruyter GmbH, Berlin/Boston
