Device for inducing periodical domain reversal of ferroelectric crystal by laser interference

Abstract

The invention relates to a device for inducing the periodical domain reversal of a ferroelectric crystal by laser interference. A periodical structure is realized by using an interference method of two light beams, a polarization electric field is realized by using quartz windows and electrolyte electrodes, laser coherence irradiation is performed simultaneously, and thus, the laser-induced periodical domain reversal is realized. The device can be applied to the periodical domain reversal of the ferroelectric crystal with a fine structure in the micro scales of micron and submicron dimensions, finer and more complex all-optical microstructural devices can be manufactured, and the device can be widely applied to multiple key fields of quasi-phase-matching non-linear optics, novel optical devices and the like. The device is applicable to multi-wavelength induction light, can not be limited by an induction light source and the size of a mask, and can greatly reduce the polarization electric filed of the ferroelectric domain. The invention has more flexible manufacture, more perfect periodical structure, easy operation, accurate size, reliable principle and no damage.

Description

technical field [0001] The present invention is related to ferroelectric domains, especially a device for inducing periodic domain inversion of ferroelectric crystals by laser interference. The polarization reversal electric field is used for periodical domain reversal of ferroelectric crystals with fine structures on the microscale and submicron scale, which is conducive to the production of finer and more complex all-optical microstructure devices, and thus is widely used in quasi-phase Many important fields such as matching nonlinear optics and new optical devices. Background technique [0002] Periodically poled lithium niobate crystals have been widely used in many fields such as laser frequency doubling, optical parametric oscillation and other nonlinear optics and new optical devices. With the future development of nonlinear ferroelectric materials, such as the generation of first-order quasi-phase-matched ultraviolet second harmonics, electro-optic Bragg gratings an...

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Problems solved by technology

This method is limited by the induced light and the material damage threshold, and is only suitable for ultra-intense and ultra-fast lasers to achieve crystal domain inversion, and it is easy to cause material surface damage

[0005] The applied electric field periodic polarization method directly uses the applied electric field method to realize the periodic domain inversion of ferroelectric crystals. The required polarization electric field is too large, which limits the polarization thickness of the crystal and the uniformity of the device. The obtained inversion domain body The size is limited to a few microns, which cannot meet the development requirements of technologies such as quasi-phase matching.

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