Abstract
A quasi-phase matching (QPM) structure based on phase correction by inserting a “healing block” (HB) of length into regular domains of constant length is proposed to enhance the nonlinear conversion efficiency when the first-order QPM domain length is too short to be reliably fabricated. Second-harmonic conversion efficiency 4.69 times higher than that of a third-order QPM grating has been experimentally demonstrated by using HB-QPM where all the domains are longer than .
© 2013 Optical Society of America
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