Polarization method for ferroelectric crystal material

A ferroelectric crystal, repolarization technology, applied in nonlinear optics, instruments, optics, etc., to achieve easy-to-achieve effects

Inactive Publication Date: 2011-07-13
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of this, the main purpose of the present invention is to provide a kind of polarization method of ferroelectric crystal material, to solve the problem of preparing small-period periodicity and quasi-periodic periodicity inversion ferroelectric crystal material, to achieve the preparation of small-period periodicity and The purpose of quasi-periodic periodic inversion ferroelectric crystal materials

Method used

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  • Polarization method for ferroelectric crystal material
  • Polarization method for ferroelectric crystal material
  • Polarization method for ferroelectric crystal material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In this example, a lithium niobate periodically polarized crystal with a period of 4.2 μm is obtained by two-step polarization, which is suitable for frequency-doubling output of light waves with a wavelength of 850 nm.

[0037] 1. First obtain a periodically polarized crystal with a period of 8.4 μm and a polarization duty ratio of 25%. As attached image 3 As shown in the first step, the ferroelectric domain reversal after polarization is shown in Figure 4 Shown.

[0038] 2. Perform the second step of polarization on the basis of 1, as attached image 3 In the second step, the ferroelectric domain reversal after polarization is shown in Figure 5 Shown.

[0039] 3. In this example, the width and length of the metal electrode are determined according to the law of domain growth and experimental requirements.

Embodiment 2

[0041] The three-step or multi-step polarization method in this example. Only need to change the polarization step into three or more steps. If it is three or more steps, the grating metal electrode required for polarization is composed of three or more parts. Each step of the polarization process connects the high voltage pulse to the grating electrode. Part, until all the polarization steps have been implemented.

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Abstract

The invention relates to the technical field of after treatment on crystal materials, and discloses a polarization method for a ferroelectric crystal material. The method comprises two or more steps for preparing a short-period periodic and quasi-periodic inversion ferroelectric crystal; wherein a first step is used for applying high pulse voltage on the ferroelectric crystal to implement long-period ferroelectric crystal polarization; and a second step is used for polarizing the ferroelectric crystal again based on the first step, if the polarization is multi-step polarization, a third step is used for polarizing the ferroelectric crystal again based on the second step, and the rest is deduced from this, until the needed period is produced. With the method provided by the invention, a uniform short-period periodic polarized ferroelectric crystal body can be produced.

Description

Technical field [0001] The invention relates to the technical field of post-treatment of ferroelectric crystal materials, in particular to a polarization method of ferroelectric crystal materials. Background technique [0002] The quasi-phase matching (QPM) technology compensates the phase mismatch between the interacting light waves caused by refractive index dispersion by periodically modulating the nonlinear polarizability of the crystal to obtain the enhancement of the nonlinear optical effect, that is, using The periodic jump of the nonlinear polarizability can realize the enhancement of nonlinear optical frequency conversion efficiency. The polarization method of ferroelectric crystal materials is the key technology for preparing periodic reversal ferroelectric crystals. In particular, periodic reversal ferroelectric crystals with small periods are one of the hotspots in domestic and foreign research. Periodic reversal ferroelectric crystals It is a necessary material for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/35G02F1/05
CPCG02F1/3558
Inventor 范学东马传龙王海玲王宇飞马绍栋郑婉华
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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