title: Healing-block-assisted quasi-phase matching.
abstract: A quasi-phase matching (QPM) structure based on phase correction by inserting a "healing block" (HB) of length d(HB) into M regular domains of constant length d is proposed to enhance the nonlinear conversion efficiency when the first-order QPM domain length d1 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 1.08d1.
authors.affiliation: Institute of Photonics Technologies, National Tsing Hua University, Hsinchu, Taiwan.
authors.forename: Jui-Yu
authors.initials: JY
authors.lastname: Lai
authors.forename: Cheng-Wei
authors.initials: CW
authors.lastname: Hsu
authors.forename: Dong-Yi
authors.initials: DY
authors.lastname: Wu
authors.forename: Sheng-Bang
authors.initials: SB
authors.lastname: Hung
authors.forename: Ming-Hsien
authors.initials: MH
authors.lastname: Chou
authors.forename: Shang-Da
authors.initials: SD
authors.lastname: Yang