Terahertz generation via optical rectification of x-mode laser in a rippled density magnetized plasma
- Department of Physics, Indian Institute of Technology, Delhi, New Delhi 110016 (India)
A scheme of resonant terahertz radiation generation by the optical rectification of a picosecond laser pulse in rippled density magnetized plasma is examined. The x-mode laser pulse, propagating perpendicular to dc magnetic field, exerts a quasistatic ponderomotive force on electrons, imparting them a drift with finite transverse component. The drift velocity beats with the density ripple to produce a current, resonantly driving terahertz radiation at frequency comparable to the inverse pulse duration. The terahertz power scales as the square of density ripple amplitude and rises with magnetic field strength. In the case when magnetic field is azimuthal with appropriate r-dependence, the terahertz power has a ring shape intensity distribution. At laser intensity of {approx}3x10{sup 15} W/cm{sup 2}, in a 0.01% critical density plasma with 30 kG magnetic field and 30% density ripple, one may have power conversion efficiency of 0.04%.
- OSTI ID:
- 21272733
- Journal Information:
- Physics of Plasmas, Vol. 16, Issue 10; Other Information: DOI: 10.1063/1.3248303; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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