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Magneto-optic crystal doped with terbium vanadate, growth method and application thereof

A technology of magneto-optical crystals and growth methods, applied in crystal growth, single crystal growth, single crystal growth and other directions, can solve the problem that TGG crystals are difficult to grow high-quality crystals, it is difficult to obtain bulk high-quality crystals, and the utilization of crystals is affected. problems, to achieve the effect of low cost, less use, and compact device design

Active Publication Date: 2017-10-13
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is: at high temperature, due to the volatility of its components, it is difficult for TGG crystals to grow high-quality crystals
However, it is a non-identical melt when it is melted, and it cannot be grown by the pulling method. It is still difficult to obtain massive high-quality crystals.
[0005] BYZGR 4 The application of the crystal as a magneto-optic crystal has been reported, and its applicable wavelength is 500-1500nm. The Faraday rotation angle of the crystal at 1064nm is 1.45 times that of the TGG crystal, but the extinction ratio is 28.7dB, which is smaller than that of the TGG crystal (≥30dB). Affected the use of crystals

Method used

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  • Magneto-optic crystal doped with terbium vanadate, growth method and application thereof
  • Magneto-optic crystal doped with terbium vanadate, growth method and application thereof
  • Magneto-optic crystal doped with terbium vanadate, growth method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Ca 0.2 Y 0.1 Tb 0.7 VO 4 Single crystal preparation

[0048] (1) Weigh high-purity raw material CaCO 3 , Tb 4 o 7 , V 2 o 5 and Y 2 o 3 , mix the weighed raw materials evenly, put them into a mold and press into a crucible for sintering, the sintering temperature is 1200 ° C, and sintering for about 12 hours to obtain Y and Ca doped TbVO 4 polycrystalline material;

[0049] (2) Get 650 grams of the polycrystalline material that step (1) obtains, put it into the iridium gold crucible of 60 millimeters in diameter, then put the iridium gold crucible into the single crystal furnace to evacuate, and fill into protective gas Nitrogen, adopt the medium frequency induction heating method, raise the temperature to about 1740 degrees, the polycrystalline material is melted, then increase the temperature by 8 degrees, and keep the temperature for ten minutes to make the melt mix evenly.

[0050] (2) Using direction TbVO 4 As a seed crystal, slowly lower i...

Embodiment 2

[0053] Example 2: Ca 0.1 Tb 0.9 VO 4 Single crystal preparation

[0054] The operation steps are the same as those in Example 1, except that:

[0055] No doping metal oxide is added, and in the crystal growth stage, the direction TbVO is used 4 As a seed crystal, the grown crystal is Ca 0.1 Tb 0.9 VO 4 , The crystal shape is symmetrical, and the crystal size is Ф21×26mm.

[0056] where Ca 0.1 Tb 0.9 VO 4 The X-ray powder diffraction pattern of polycrystalline material is attached figure 1 shown.

Embodiment 3

[0057] Embodiment 3: Preparation of polarization-dependent optical isolator

[0058] as attached figure 2 The schematic diagram of the optical isolator shown uses a 1064nm laser as a light source, and the Ca 0.2 Y 0.1 Tb 0.7 VO 4 The magneto-optic crystal device is placed in a magnetic field, and a polarizer and an analyzer are placed in the front and back respectively, and the polarization direction of the analyzer and the polarization direction of the polarizer form an angle of 45°. The light passing direction is parallel to the magnetic field direction.

[0059] Under the condition of magnetic field, the 1064nm laser beam emitted by the laser becomes polarized light after passing through the polarizer, and the polarization direction of the magneto-optical crystal device is rotated by 45°, while the polarization direction of the analyzer and the polarization direction of the polarizer form an angle of 45° , so that the light passes smoothly, and the reflected polarized...

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Abstract

The invention relates to a magneto-optic crystal doped with terbium vanadate, a production method and application thereof. The molecular formula of the magneto-optic crystal doped with terbium vanadate is CaxMyTb1‑x‑yVO4, wherein M is a rare earth element and an alkali metal element , 0.01≤x≤0.5, 0≤y≤0.5. The Faraday rotation angle of this series of crystals at 1064nm is 1.3‑1.5 times that of TGG crystals. The crystals are melted with the same composition and can be grown by pulling method. It is easy to grow large-sized crystals. The cost of raw materials is low, which can effectively reduce the cost of magneto-optical crystals. . The magneto-optic crystal device made of the magneto-optic crystal has a large Verdet constant when making a magneto-optic isolator, which can reduce the requirement for the length of the magneto-optic crystal. Compared with the existing technology, the device design is more compact , reduce the number of magneto-optical crystals used in the isolator, and reduce costs. The invention can also be used in the manufacture of optical switches.

Description

technical field [0001] The invention belongs to the technical field of crystal materials, and in particular relates to a magneto-optic crystal doped with terbium vanadate, a growth method and an application thereof. Background technique [0002] Magneto-optic crystals are important functional crystals with magneto-optical effects in the ultraviolet to infrared band. The Faraday effect can be used to make magneto-optical isolators, magneto-optical deflectors, magneto-optical switches, magneto-optic modulators, magneto-optical circulators, magneto-optic retarders, magneto-optical information processing systems, and optical fiber current sensors for strong magnetic fields and high-voltage transmission lines Wait. [0003] At present, terbium gallium garnet (TGG), the mainstream magneto-optic crystal for commercial application, was developed by Fujian Fujing Technology Co., Ltd. in 2008. It is mainly used to make Faraday rotators and isolators. The best magneto-optical materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 胡章贵涂衡赵营岳银超范飞镝
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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