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Preparation method and polarization equipment of fan-shaped periodic optical superlattice polarization crystal

An optical superlattice, polarized crystal technology, applied in optics, optical components, nonlinear optics, etc., can solve the problem of different domain expansion speeds, affecting the use efficiency of optical superlattice polarized crystal devices, and the same fan-shaped periodic structure. Inconsistent cycle duty ratio and other problems, to achieve the effect of improving the light-to-light conversion efficiency

Active Publication Date: 2019-05-28
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the actual process, since the inverted domain is a fan-shaped structure, that is, the angle between the electrode structure and the Y axis is different, in the uniform polarization process, the expansion speed of the domain domain is different. The larger the angle, the faster the expansion speed. The faster it is, the duty ratio of the same period of the fan-shaped periodic structure is inconsistent, which affects the efficiency of the entire optical superlattice polarized crystal device

Method used

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  • Preparation method and polarization equipment of fan-shaped periodic optical superlattice polarization crystal
  • Preparation method and polarization equipment of fan-shaped periodic optical superlattice polarization crystal
  • Preparation method and polarization equipment of fan-shaped periodic optical superlattice polarization crystal

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Embodiment 1

[0057] figure 1 It is a flow chart of a preparation method of fan-shaped periodic optical superlattice polarized crystal, figure 2 is a structural schematic diagram of the first electrode structure and the second electrode structure, image 3 It is a schematic diagram of the working state of the fan-shaped periodic optical superlattice polarized crystal, Figure 4 It is a flow chart of another preparation method of fan-shaped periodic optical superlattice polarized crystal; below in conjunction with Figure 1 to Figure 4 This embodiment will be described.

[0058] Such as figure 1 As shown, the preparation method of a sector-shaped periodic optical superlattice polarized crystal provided by the application at least includes the following steps:

[0059] S100, making a first electrode structure and a second electrode structure on the +Z surface and the -Z surface of the superlattice crystal substrate, respectively;

[0060] Wherein, the first electrode structure includes ...

Embodiment 2

[0098] Figure 5 Schematic diagram of the equipment for preparing sector-shaped periodic optical superlattice polarized crystals, combined below Figure 5 This embodiment will be described.

[0099] Such as Figure 5 As shown, the application provides a kind of polarization equipment for preparing the above-mentioned fan-shaped periodic optical superlattice polarized crystal, including a clamp for clamping the superlattice crystal substrate, a plurality of positive electrode pins 301, a plurality of negative electrode pins 302, a first shunt switch 401, a second shunt switch 402, a control circuit 500, a high-voltage amplifier 600, and a program control device 800;

[0100] The clamp includes a positive electrode splint 201 and a negative electrode splint 202;

[0101]The positive electrode splint 201 is provided with a plurality of through holes for the positive electrode pin 301 to pass through;

[0102] The negative clamping plate 202 is provided with a plurality of pro...

Embodiment 3

[0113] In this example, a method for preparing a fan-shaped periodic optical superlattice polarized crystal device with a uniform duty ratio of the same period is proposed. The prepared polarization period is 23-32um, and the matrix material is magnesium-doped lithium niobate crystal, which is used for OPO Fabrication of mid-to-far infrared crystal frequency conversion devices. The production method is as follows:

[0114] A 3-inch Mg-doped lithium niobate wafer (superlattice crystal substrate 100a) with a thickness of 2 mm was prepared, and photolithography and coating were performed on its +Z and -Z planes to produce the designed first electrode structure. The width of the electrode line 1011 on the +Z surface of the wafer is 5um, and the oblique angle between the electrode line 1011 in the middle part of the first electrode structure and the Y-axis of the wafer is 0°, and increases toward both ends, according to the preset angle interval (0°-0.5°), (0.5°-1°), (1°-1.5°), (1...

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Abstract

The invention discloses a preparation method and polarization equipment of a fan-shaped periodic optical superlattice polarization crystal. The preparation method comprises the following steps: S100,a first electrode structure and a second electrode structure are respectively manufactured on the + Z plane and the + Z plane of the superlattice crystal substrate, wherein the first electrode structure comprises a plurality of electrode lines, and the electrode lines are arranged on the + Z plane to form radial fan-shaped regions symmetrical about a Y axis; the second electrode structure comprises a plurality of electrode regions; S200, the electrode lines are divided according to an inclined included angle to form a plurality of sub-electrode line groups; S300, the polarization conditions ofeach sub-electrode line group are respectively controlled so as to polarize the superlattice crystal substrate, so that the fan-shaped periodic optical superlattice polarized crystal can be obtained.According to the preparation method, the fan-shaped periodic optical superlattice polarized crystal device with uniform duty ratio in the same period can be obtained, and the optical conversion efficiency of the device is greatly improved.

Description

technical field [0001] The application relates to a preparation method and polarization equipment of a fan-shaped periodic optical superlattice polarized crystal, belonging to the field of crystal optical devices. Background technique [0002] Quasi phase matching (QPM) technology is an important phase matching technology in nonlinear optics. It has many technical advantages. The optical superlattice polarized crystal produced by it is an important material in the field of optical frequency conversion and optical parameter conversion. At the same time, it can meet the needs of different application scenarios through flexible domain structure design. The biggest advantage of QPM technology is that it can take advantage of the maximum nonlinear coefficient of nonlinear materials, and enable those crystals and light-passing bands that cannot achieve phase matching with BPM technology to achieve frequency conversion, broaden the range of nonlinear frequency conversion, and incre...

Claims

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Application Information

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IPC IPC(8): G02B1/00G02F1/35G02F1/355
Inventor 陈怀熹李广伟张新彬冯新凯古克义梁万国黄玉宝
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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