The use of counterpropagating laser pulses to suppress high harmonic generation (HHG) is investigated experimentally for pulses polarized parallel or perpendicular to the driving laser pulse. It is shown for the first time that perpendicularly polarized pulses can suppress HHG. The intensity of the counterpropagating pulse required for harmonic suppression is found to be much larger for perpendicular polarization than for parallel polarization, in good agreement with simple models of the harmonic suppression. These results have applications to quasi-phase-matching of HHG with trains of counterpropagating pulses.
© 2007 Optical Society of America
Original Manuscript: February 2, 2007
Revised Manuscript: June 28, 2007
Manuscript Accepted: July 9, 2007
Published: August 27, 2007
Matt Landreman, Kevin O'Keeffe, Tom Robinson, Matt Zepf, Brendan Dromey, and Simon M. Hooker, "Comparison of parallel and perpendicular polarized counterpropagating light for suppressing high harmonic generation," J. Opt. Soc. Am. B 24, 2421-2427 (2007)