公开(公告)号：US20240369906A1

公开(公告)日：2024-11-07

申请号：US18778281

申请日：2024-07-19

Applicant: ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA

Inventor： Linran FAN ,  Pao-Kang CHEN

IPC: G02F1/355 ,  G02F1/377

Abstract: The adaptive methodology of (purposefully, intentionally aperiodically) poling of an optical waveguide made in a nonlinear material substrate to achieve a continuous increase of overall nonlinear conversion efficiency with increase in the length of such waveguide. As a result of such poling, the variation of at least a waveguide thickness is compensated by adjusting the poling period along the waveguide to match the local momentum difference of the nonlinear process. For a second-harmonic generation, a near-ideal performance of the nonlinear energy conversion process was demonstrated even for a 21 mm long waveguide (with the SHG efficiency as high as 9415%/W and a 82.6% absolute power conversion efficiency). The adaptive poling methodology can also be applied to compensate other systematic inhomogeneity of a WG device in, for example, etching depth, diffusion depth, dose of lithographic exposure of the nonlinear material, and doping density across the nonlinear material substrate.