Abstract
A high power laser beam propagating through collisional plasma creates a low density channel through which it propagates self-guided. This equilibrium, however, is unstable to stimulated Raman back scattering above a threshold power. The self focusing, leads to enhancement of wave intensity, elevation of electron temperature and reduction of local electron density, leading to diminished attenuation rate. Stimulated Raman scattering instability is treated for laser beam propagating through collisional plasma with thermal conduction in a self-focused filament. Thermal conduction could play a dominant role in determining the energy dissipation of electrons. Inside a filament, the laser undergoes stimulated Raman backscattering. Since the temperature inside a filament is higher and density lower than those outside, the collisional damping rates of the decay waves are lowered and hence the threshold power for B-SRS is reduced. It remains an important process in laser produced plasma. It is also a limiting process in a plasma- loaded free electron laser.
Similar content being viewed by others
References
M S Sodha, A K Ghatak and V K Tripathi Prog. Opt. 13 169 (1976)
A Ghatak Indian J. Phys. 84 1075 (2010)
M Sodha, S K Agarwal and A Sharma Phys. Plasmas 13 103107 (2006)
M S Sodha and A Sharma Phys. Plasmas 13 053105 (2006)
C Venugopal, M J Kurian, E Savithri Devi, P J Jessy, C P Anilkumar and G Renuka Indian J. Phys. 84 319 (2010)
N Nimje, S Dubey and S Ghosh Indian J. Phys. 84 1567 (2010)
K Roy and P Chatterjee Indian J. Phys. 85 1653 (2011)
C L Shepard, J A Tarvin, R L Berger, G E Busch, R R Johnson and R J Schroeder Phys. Fluids 29 583 (1986)
D Li, Y Ouyang, L Chen, W Cao and S Shi Indian J. Phys. 85 293 (2011)
W Seka, E A Williams, R S Craxton, L M Goldman, R W Short and K Tanaka Phys. Fluids 27 2181 (1984)
S Kumar, A K Rai, S B Rai and D K Rai Indian J. Phys. 84 563 (2010)
C S Liu and V K Tripathi Phys. Fluids 29 4188 (1986)
V Sajal, D Dahiya and V K Tripathi Phys. Plasmas 14 032109 (2007)
R Short, W Seka and R Bahr Phys. Fluids 30 3245 (1987)
R K Drampyan J. Opt. A 6 213 (2004)
V Sajal Phys. Scr. 74 484 (2006)
L Yin, BJ Albright, H A Rose, K J Bowers and B Bergen Phys. Plasmas 16 113101 (2009)
S Kaur and A K Sharma Phys. Plasmas 18 92105 (2011)
Ghanshyam and VK Tripathi Indian J. Phys. 79 515 (2005)
R K Kirkwood, E Dewald, C Niemann, N Meezan, S C Wilks, D W Price, O L Landen, J Wurtele, A E Charman, R Lindberg, N J Fisch, V M Malkin, and E O Valeo Phys. Plasmas 14 113109 (2007)
L Divol, L J Suter, S Depierreux and W Seka Phys. Plasmas 13 082703 (2006)
D Sajan, T Kuruvilla, K P Laladhas and I H Joe Indian J. Phys. 85 477 (2011)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ghanshyam Simulated Raman scattering instability of laser beam in a plasma channel. Indian J Phys 86, 731–738 (2012). https://doi.org/10.1007/s12648-012-0120-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12648-012-0120-4