Method for changing reversal domain width of potassium titanyl phosphate crystal material

Abstract

The invention discloses a method for changing the reversal domain width of a potassium titanyl phosphate crystal material. The method comprises the following steps: (1) respectively manufacturing a first electrode and a second electrode on a-Z surface and a + Z surface of a potassium titanyl phosphate crystal substrate; (2) performing periodic polarization on the potassium titanyl phosphate crystal with the manufactured electrode in a mode of externally applying pulse voltage, and setting polarization parameters of an electrode wire group according to the size of the first electrode; (3) testing the actual transverse broadening width of the domain wall of the polarized potassium titanyl phosphate crystal; and (4) putting the polarized potassium titanyl phosphate crystal into a drying oven, and setting the constant temperature and time of the drying oven according to the actual transverse broadening width of the domain wall obtained by testing. According to the method, the ferroelectric domain is transversely expanded and returned in the inversion process through high-temperature annealing, and the domain wall width is close to a theoretical value, so that the inversion domain of the potassium titanyl phosphate crystal is effectively regulated and controlled, the conversion efficiency of a wafer is improved, and the method has a relatively good application prospect.

Description

technical field [0001] The present invention relates to the technical field of nonlinear crystal materials, and more particularly, to a method for changing the width of inversion domains of potassium titanyl phosphate crystal materials. Background technique [0002] Periodic polarization of nonlinear optical crystals with ferroelectric properties can compensate for the phase mismatch caused by refractive index dispersion, and utilize its maximum nonlinear optical coefficient, thereby improving nonlinear optical frequency conversion efficiency. [0003] Potassium titanyl phosphate (KTiOPO) 4 , KTP) crystal is an excellent nonlinear optical crystal with ferroelectric properties. At present, the most commonly used method for preparing periodically polarized KTP (PPKTP) crystal is electric field polarization method. Then electrodes are plated, and finally a pulse voltage is applied to realize the periodic inversion (vertical direction) of the ferroelectric domains of the wafer...

AI Technical Summary

Problems solved by technology

However, before the wafer ferroelectric domain is completely reversed (vertical direction), the domain wall will be accompanied by a certain degree of lateral expansion (horizontal direction), and this lateral expansion will make the actual width of the reversed domain larger than the theoretical value (this phenomenon in It is more obvious under short-period electrodes, and even domain merging occurs), which greatly affects the optical conversion efficiency of periodically poled crystals

[0004] Therefore, how to provide a method for changing the domain width by annealing to solve the problem that the domain wall of the potassium titanyl phosphate crystal is too wide during the domain inversion process is a technical problem that those skilled in the art need to solve urgently.

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