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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 15 — Aug. 1, 2012
  • pp: 3279–3281

Enhanced harmonic generation by breaking the phase-matching symmetry

G. N. Gibson, N. Majtenyi, and E. Sergan  »View Author Affiliations

Optics Letters, Vol. 37, Issue 15, pp. 3279-3281 (2012)

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We introduce two static methods to break the phase-matching symmetry in third harmonic generation with a focused Gaussian beam in the tight focusing limit, dramatically increasing the conversion efficiency and mode quality. Both rely on inhibiting harmonic generation immediately after the beam waist, preventing the near perfect cancellation of the third harmonic generation (THG) from before and after the focus. The first method involves placing a thin metal septum at the waist: the laser drills a small pinhole, which, in turn, disrupts the beam focus after the pinhole. The second method is based on placing a large χ(3) gas before the focus and a small χ(3) gas after the focus.

© 2012 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: May 21, 2012
Revised Manuscript: June 29, 2012
Manuscript Accepted: July 1, 2012
Published: July 31, 2012

G. N. Gibson, N. Majtenyi, and E. Sergan, "Enhanced harmonic generation by breaking the phase-matching symmetry," Opt. Lett. 37, 3279-3281 (2012)

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