Periodically Poled Potassium Titanyl Phosphate (PPKTP) crystal is a ferroelectric nonlinear crystal with a unique structure, which aids in efficient frequency conversion through Quasi - Phase - Matching (QPM). The crystal is composed of alternating domains with spontaneous polarization of opposite orientations, enabling QPM to correct the phase mismatch in nonlinear interactions. The crystal is suitable for efficient conversion of any nonlinear process within its transparency range.
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