Nonlinear Propagation of a Short-Pulse Laser in a Plasma with Density Ripple
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- Title
- Nonlinear Propagation of a Short-Pulse Laser in a Plasma with Density Ripple
- Authors
- Sukhdeep Kaur; Sharma, AK; Ryu, CM
- Date Issued
- 2008-12
- Publisher
- KOREAN PHYSICAL SOC
- Abstract
- In recent experiments, density ripples have been used to achieve phase-matched harmonic generation from plasmas. We report a numerical study of nonlinear propagation of an intense short-pulse laser in a plasma containing a large-amplitude density ripple. The laser with a Gaussian distribution of the intensity along its wavefront undergoes periodic self focusing due to relativistic and pondero-motive nonlinearity. In the region of high plasma density, the self-focusing effect dominates over the diffraction effect and the laser converges. As the beam enters the low-density region, the diffraction effect supercedes the self-focusing effect and diverges the beam. For ripple periods shorter than the Rayleigh diffraction length, the beam width parameter has a minor wiggle as a function of the distance of propagation. When the ripple period is long, the wiggle in the beam width parameter becomes large.
- Keywords
- Self focusing harmonic generation density ripple plasma; INTENSE LASER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/28349
- DOI
- 10.3938/jkps.53.3768
- ISSN
- 0374-4884
- Article Type
- Article
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, vol. 53, no. 6, page. 3768 - 3771, 2008-12
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