CN114262939B - Periodically polarized potassium tantalate niobate crystal and preparation method thereof - Google Patents
Periodically polarized potassium tantalate niobate crystal and preparation method thereof Download PDFInfo
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- CN114262939B CN114262939B CN202111341469.8A CN202111341469A CN114262939B CN 114262939 B CN114262939 B CN 114262939B CN 202111341469 A CN202111341469 A CN 202111341469A CN 114262939 B CN114262939 B CN 114262939B
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Abstract
The invention relates to a periodically polarized potassium tantalate niobate crystal and a preparation method thereof. The invention realizes the stable control of the non-target direction domain structure by the method of electric field auxiliary external electric field polarization. The direction and the polarization period of the domain structure can be adjusted according to actual requirements, the scheme can stably control the non-target direction domain structure and obtain a periodic polarization potassium tantalate niobate crystal, and a high-efficiency nonlinear frequency conversion process can be realized.
Description
Technical Field
The invention relates to the technical field of nonlinear optical crystal materials and laser, in particular to a preparation method of a periodically polarized potassium tantalate niobate crystal.
Background
The potassium tantalate niobate (PPKTN) based on periodic polarization can be prepared by the following method: periodic metal electrodes are plated on the wafer by utilizing a micro-nano processing photoetching technology, and periodic reversal of the ferroelectric domain of the wafer is realized by applying a high-voltage electric field with a special waveform. However, the tetragonal potassium tantalate niobate has abundant spontaneous domain structures, so when a single-period domain structure is required for quasi-phase matching, domain structures in different polarization directions provide inverted lattice vectors in other directions, which affects the quasi-phase matching period required in the original nonlinear process, resulting in low nonlinear conversion efficiency.
Disclosure of Invention
The invention provides a periodically poled potassium tantalate-niobate crystal and a preparation method thereof, aiming at the problems that in the prior art, the periodically poled potassium tantalate-niobate crystal has rich spontaneous poling directions and unstable domain directions, which cause low nonlinear conversion efficiency of required periodic poling. The stable control of the non-target direction domain structure is realized by an electric field auxiliary external electric field polarization method, so that a potassium tantalate niobate (KTN) crystal with a periodic polarization ferroelectric domain structure is formed, and a high-efficiency nonlinear frequency conversion process is realized.
The technical scheme of the invention is realized in the following mode.
In a first aspect, the invention provides a preparation method of a periodically poled potassium tantalate niobate crystal.
A preparation method of periodically polarized potassium tantalate niobate crystals is characterized in that polarization of an external electric field is assisted on the basis of an original polarization electric field, and the periodically polarized potassium tantalate niobate crystals are prepared, wherein the original polarization electric field and the external electric field are applied in different directions of x, y and z axes.
Further, the potassium tantalate niobate crystal is cut according to a certain axis direction, a periodic electrode is plated on the positive surface of the potassium tantalate niobate crystal in the certain axis direction, a metal layer is plated on the negative surface of the potassium tantalate niobate crystal in the axis direction, voltage is applied to the positive surface of the potassium tantalate niobate crystal in the axis direction to form the original polarization electric field, the negative surface of the potassium tantalate niobate crystal in the axis direction is grounded, the ferroelectric domain under the periodic electrode is inverted, and meanwhile, the external electric field is applied to the other axis directions of the potassium tantalate niobate crystal to eliminate the ferroelectric domain in the non-target direction.
Preferably, the applied electric field is constant.
Preferably, the light-passing surface of the potassium tantalate-niobate crystal is polished to be coated or not coated.
Further, the external electric field is a voltage applied in the x direction, the y direction or the z direction, so that the ferroelectric domain maintains a single domain stable state, and the direction of the voltage is determined according to the crystal tangential direction.
Further, the thickness of the potassium tantalate niobate crystal ranges from 0.1 μm to 5mm.
Further, the domains may be arranged in regular stripes or in patterns, depending on the shape of the polarizing electrode.
In a second aspect, the present invention provides a periodically poled potassium tantalate niobate crystal obtained by the above preparation method.
In a third aspect, the invention provides an application of the periodically poled potassium tantalate niobate crystal in a nonlinear frequency conversion crystal device.
The invention has the beneficial effects that:
(1) Compared with the prior art that the electric field polarization is carried out only in a single direction, the invention adds an auxiliary external electric field on the basis of the original polarization electric field, and the external electric field controls the non-target direction domain structure of the crystal through the external non-polarization direction electric field, thereby obtaining the periodically polarized potassium tantalate niobate crystal.
(2) The invention realizes high-efficiency nonlinear frequency conversion in the preparation of the periodically poled potassium tantalate niobate crystal, and can adjust the direction of a domain structure and the poling period according to actual requirements. The method is simple to operate, easy to control conditions and wide in prospect in practical application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments and illustrations of the application are intended to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of example 1;
FIG. 2 is a schematic view of example 2;
fig. 3 is a diagram showing a single domain structure and a multi-domain structure.
Detailed Description
The present invention is further described below with reference to the following drawings and examples, but is not limited thereto.
The crystal provided by the invention is a potassium tantalate niobate crystal with a chemical formula of KTa 1-x Nb x O 3
The following description is a specific embodiment of the preparation method of the potassium tantalate niobate periodically poled crystal.
Example 1
FIG. 1 is a schematic view of example 1.
The preparation method of the potassium tantalate niobate periodically poled crystal comprises the following steps:
(1) Selecting and cleaning the following potassium tantalate niobate crystals: the light passing direction of the crystal is the x direction, the thickness range of the polarized crystal is 0.1 μm-5mm, and the polarization period is preferably 5.72 μm.
(2) Designing a 5.72 mu m period electrode mask;
(3) Evaporating a layer of uniform aluminum metal electrode on the front surface of the potassium tantalate niobate crystal, and evaporating a layer of aluminum metal electrode with uniform thickness on the + z surface, the-z surface and the y surface of the wafer;
(4) Spin-coating photoresist, and baking at 60 ℃ for 20min; photoetching to obtain a corresponding frame-shaped electrode pattern, and baking for 30min at 60 ℃ after developing; removing the aluminum metal electrode uncovered by the photoresist by phosphoric acid corrosion, and removing the photoresist by acetone to obtain a corresponding aluminum electrode pattern;
(5) Applying an external voltage to carry out periodic polarization on + z and-z surfaces of the potassium tantalate-niobate crystal, and applying a constant electric field at two ends of the y surface to eliminate non-180-degree domains in the x direction and stably control the domains to obtain a periodic domain structure with uniform z-direction distribution; the single domain structure and the multi-domain structure are shown in fig. 3.
(6) Removing the electrodes on the two sides of the crystal to obtain the periodically polarized potassium tantalate niobate crystal.
The periodically poled potassium tantalate niobate crystal can be used as a one-dimensional quasi-phase matching optical parametric crystal device of a light source with the wavelength of 1.064 mu m to 5 mu m.
Example 2:
FIG. 2 is a schematic view of example 2.
The preparation method of the potassium tantalate niobate periodically poled crystal comprises the following steps:
(1) Selecting and cleaning the following potassium tantalate niobate crystals: the light passing direction of the crystal is the x direction, the thickness range of the polarized crystal is 0.1 μm-5mm, and the polarization period is preferably 5.72 μm.
(2) Designing a 5.72 mu m period electrode mask;
(3) Evaporating a layer of uniform metal aluminum electrode on the front surface of the wafer, and evaporating a layer of uniform aluminum metal electrode on the + z surface, the-z surface and the x surface of the wafer;
(4) Spin-coating a photoresist, and baking at 60 ℃ for 20min; photoetching to obtain a corresponding frame-shaped electrode pattern, and baking for 30min at 60 ℃ after developing; removing the aluminum which is not covered by the photoresist by phosphoric acid corrosion, and removing the photoresist by acetone to obtain a corresponding aluminum electrode pattern;
(5) And applying an external voltage to carry out periodic polarization on + z and-z surfaces of the potassium tantalate-niobate crystal, and applying a constant electric field at two ends of the x surface to eliminate non-180-degree domains in the x direction and stably control the domains to obtain a periodic domain structure with uniform z-direction distribution.
(6) And removing the electrodes on the two sides of the crystal to obtain the periodically polarized potassium tantalate niobate crystal.
The periodically poled potassium tantalate niobate crystal can be used as a one-dimensional quasi-phase matching optical parametric crystal device of a light source with the wavelength of 1.064 mu m to 5 mu m.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A preparation method of periodically poled potassium tantalate niobate crystals is characterized in that the preparation method is to assist external electric field polarization on the basis of an original poled electric field to prepare the periodically poled potassium tantalate niobate crystals, wherein the original poled electric field and the external electric field are applied in different directions on x, y and z axes;
cutting the potassium tantalate niobate crystal according to a certain axis direction, plating a periodic electrode on the positive surface of the potassium tantalate niobate crystal in the certain axis direction, plating a metal layer on the negative surface of the potassium tantniobate crystal in the axis direction, applying a voltage on the positive surface of the potassium tantniobate crystal in the axis direction to form the original polarization electric field, grounding the negative surface of the potassium tantniobate crystal in the axis direction, reversing ferroelectric domains under the periodic electrode, and applying the external electric field on the other axis directions of the potassium tantalate niobate crystal to eliminate the ferroelectric domains in the non-target direction.
2. The method of claim 1, wherein the clear surface of the potassium tantalate niobate crystal is polished and coated before the electric field is applied.
3. The method according to claim 1, wherein the light-passing surface of the potassium tantalate-niobate crystal is polished without plating before the electric field is applied.
4. The method of claim 1, wherein the applied electric field is constant.
5. The method according to claim 1, wherein the applied electric field is a voltage applied in an x-direction, a y-direction, or a z-direction, such that the ferroelectric domain maintains a single domain stable state, and the direction of the voltage is determined according to a crystal tangent direction.
6. The method of claim 1, wherein said crystals of potassium tantalate niobate have a thickness in the range of 0.1 μm to 5mm.
7. The preparation method according to claim 1, wherein the ferroelectric domains in the periodically poled potassium tantalate niobate crystal are arranged in a regular stripe or pattern shape.
8. Periodically poled potassium tantalate niobate crystals prepared by the preparation method according to any one of claims 1 to 7.
9. The use of the periodically poled potassium tantalate niobate crystal of claim 8 in a nonlinear frequency conversion crystal device.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542285B1 (en) * | 1998-12-14 | 2003-04-01 | The Board Of Trustees Of The Leland Stanford Junior University | Backswitch poling method for domain patterning of ferroelectric materials |
| CN1937274A (en) * | 2005-09-23 | 2007-03-28 | 清华大学 | Ferroelectric domain array structure, and its preparing method and ferroelectric film having same |
| CN112987447A (en) * | 2019-12-02 | 2021-06-18 | 济南量子技术研究院 | Electrode structure for periodic polarization of ferroelectric crystal material and polarization method |
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| WO2003073160A1 (en) * | 2002-02-27 | 2003-09-04 | Mitsui Chemicals, Inc. | Ferroelectric substrate period polarization structure manufacturing method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542285B1 (en) * | 1998-12-14 | 2003-04-01 | The Board Of Trustees Of The Leland Stanford Junior University | Backswitch poling method for domain patterning of ferroelectric materials |
| CN1937274A (en) * | 2005-09-23 | 2007-03-28 | 清华大学 | Ferroelectric domain array structure, and its preparing method and ferroelectric film having same |
| CN112987447A (en) * | 2019-12-02 | 2021-06-18 | 济南量子技术研究院 | Electrode structure for periodic polarization of ferroelectric crystal material and polarization method |
Non-Patent Citations (1)
| Title |
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| 周期极化LiNbO_3晶体中电极布置对反转畴扩张的影响;王霆等;《物理学报》;20051012(第10期);全文 * |
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