Patent ID: 11868022
Assignee: IPG PHOTONICS CORPORATION
Field: Optics (Instruments)
Classification: CPC G  C  H | IPC C  G  H

Claim 5:
6. A method of fabricating a periodic structure in a strontium tetraborate (SrB4O7) or lead tetraborate (PbB4O7) nonlinear crystal, comprising:
patterning a surface of a SrB4O7 or PbB4O7 block, thereby providing a plurality of alternating protected and unprotected uniformly dimensioned regions with a uniform polarity sign of the crystal axis;
generating a disturbance on the surface, thereby inverting a sign of crystal polarity of every other region such as to provide the SrB4O7 or PbB4O7 block with a periodic volume structure including a plurality of uniformly dimensioned domains with an alternating polarity of the crystal axis, thereby obtaining the SrB4O7 or PbB4O7 nonlinear crystal enabling quasi phase-matching (QPM).