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Area of Science:

  • Nonlinear optics
  • Materials science

Background:

  • Quasi-phase matching (QPM) is crucial for efficient nonlinear optical processes.
  • Fabricating short QPM domain lengths (d1) presents significant challenges, limiting device performance.
  • Existing QPM structures struggle with efficiency when d1 is difficult to manufacture.

Purpose of the Study:

  • To propose and validate a new QPM structure incorporating a healing block (HB) to overcome fabrication limitations.
  • To enhance nonlinear conversion efficiency, particularly for short first-order QPM domain lengths.
  • To demonstrate the practical advantages of the HB-QPM approach over conventional gratings.

Main Methods:

  • Introduction of a "healing block" (HB) with length d(HB) into a QPM structure with M regular domains of length d.
  • Experimental fabrication and characterization of the proposed HB-QPM structure.
  • Comparison of second-harmonic generation (SHG) efficiency with traditional QPM gratings.

Main Results:

  • The HB-QPM structure allows for all domains to be longer than 1.08d1, improving fabrication tolerance.
  • Experimental demonstration of SHG efficiency 4.69 times higher compared to a third-order QPM grating.
  • Successful enhancement of nonlinear conversion efficiency using the HB-QPM design.

Conclusions:

  • The proposed HB-QPM structure effectively enhances nonlinear conversion efficiency.
  • The HB-QPM method provides a viable solution for fabricating QPM devices with short domain lengths.
  • This approach offers a significant improvement over conventional QPM gratings for practical applications.