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Mg-Yb-Er doped lithium niobate laser crystals and preparation method thereof

A laser crystal, three-doping technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of reduced pump efficiency, weak absorption, poor pump efficiency, photoinduced refractive index effect, and poor fluorescence lifetime and other issues, to achieve the effects of improving pumping efficiency, increasing the threshold of photorefractive changes, and enhancing fluorescence emission.

Inactive Publication Date: 2012-11-28
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the absorption of erbium ions at 980nm is very weak, which greatly reduces the pumping efficiency in laser experiments, while ytterbium ions have a strong absorption at 980nm, and the fluorescence peak of ytterbium ions is consistent with the absorption peak of erbium ions There is a strong overlap, and the energy transfer efficiency is very high, so it is feasible to choose ytterbium ions as the sensitizing ions of erbium ions to provide pumping efficiency
[0004] The present invention proposes a magnesium ytterbium erbium triple-doped lithium niobate laser crystal and its preparation method, which solves the problems of the existing erbium-doped lithium niobate laser crystal in poor pumping efficiency, photoinduced refractive index effect and fluorescence lifetime , so that it is expected to become an excellent amplification gain medium in solid-state lasers in the mid-infrared band, and it can be used in optical communications and other fields

Method used

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  • Mg-Yb-Er doped lithium niobate laser crystals and preparation method thereof
  • Mg-Yb-Er doped lithium niobate laser crystals and preparation method thereof
  • Mg-Yb-Er doped lithium niobate laser crystals and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Example 1: Er 0.015 Yb 0.03 Mg 0.05 Li 0.929 Nb 0.967 o 3 Crystal Growth Preparation

[0022] High-purity raw materials MgO, Yb 2 o 3 , Er 2 o 3 , Nb 2 o 5 and Li 2 CO 3 According to molecular formula Er 0.015 Yb 0.03 Mg 0.05 Li 0.929 Nb 0.967 o 3 For batching, mix the prepared raw materials evenly, press them into blocks, put them in a muffle furnace and heat them up to 750 degrees, keep them warm for 3 hours, remove carbon dioxide gas, and then heat them up to 1150 degrees for 6 hours to form Polycrystalline material, then put the polycrystalline material into the platinum crucible in the pulling furnace for crystal growth, the rotation speed is 12r / min, the equal diameter growth pulling speed is 0.6mm / h, and the cooling rate is 15 degrees per hour, Finally, the grown crystal was polarized at a temperature of 1190°C and a current density of 5mA / cm2, and the polarization time was 6 hours to complete the preparation of magnesium, ytterbium, and erbium...

Embodiment 2

[0023] Example 2: Er 0.01 Yb 0.02 Mg 0.05 Li 0.936 Nb 0.975 o 3 Crystal Growth Preparation

[0024] High-purity raw materials MgO, Yb 2 o 3 , Er 2 o 3 , Nb 2 o 5 and Li 2 CO 3 According to molecular formula Er 0.01 Yb 0.02 Mg 0.05 Li 0.936 Nb 0.975 o 3 For batching, mix the prepared raw materials evenly, press them into blocks, put them in a muffle furnace and heat them up to 750 degrees, keep them warm for 3 hours, remove carbon dioxide gas, and then heat them up to 1150 degrees for calcination for 8 hours to form Polycrystalline material, then put the polycrystalline material into the platinum crucible in the pulling furnace for crystal growth, the rotation speed is 10r / min, the equal diameter growth pulling speed is 0.5mm / h, and the cooling rate is 12 degrees per hour, Finally, the grown crystal will be grown at a temperature of 1200 degrees and a current density of 6mA / cm 2 Under the conditions of polarization, the polarization time is 6 hours, and the ...

Embodiment 3

[0025] Example 3: Er 0.007 Yb 0.018 Mg 0.045 Li 0.940 Nb 0.979 o 3 Crystal Growth Preparation

[0026] High-purity raw materials MgO, Yb 2 o 3 , Er 2 o 3 , Nb 2 o 5 and Li 2 CO 3 According to molecular formula Er0.007 Yb 0.018 Mg 0.045 Li 0.940 Nb 0.979 o 3 For batching, mix the prepared raw materials evenly, press them into blocks, put them in a muffle furnace and heat them up to 750 degrees, keep them warm for 4 hours, remove carbon dioxide gas, and then heat them up to 1150 degrees for 8 hours to form Polycrystalline material, then put the polycrystalline material into the platinum crucible in the pulling furnace for crystal growth, the rotation speed is 9r / min, the equal diameter growth pulling speed is 0.4mm / h, and the cooling rate is 11 degrees per hour, Finally, the grown crystal will be grown at a temperature of 1210 degrees and a current density of 6.5mA / cm 2 Under the condition of polarization, the polarization time is 8 hours, and the preparation ...

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Abstract

The invention discloses a Mg-Yb-Er doped lithium niobate laser crystals and a preparation method thereof, belonging to the field of single crystal growth. The laser crystals grow by Czochralski method, and the initial raw materials in the crystal growth formula comprise MgO, Yb2O3, Er2O3, Li2CO3 and Nb2O5 powder. The preparation method comprises the following steps: firstly preparing raw materials, mixing, and pressing, then sintering the block material, and then putting the sintered material in a lifting furnace to grow, and dissolving materials, sowing, seeding, necking, shouldering, conducting diameter growth, pulling out and annealing in the growth, and finally polarizing the grown crystals. The grown Mg-Yb-Er doped lithium niobate laser crystals disclosed herein have long fluorescent lifetime, large absorption and emission cross section, and are expected to be applied in all solid-state middle-infrared band lasers.

Description

technical field [0001] The invention relates to a preparation method of a laser crystal material, in particular to a preparation method of a magnesium ytterbium erbium tridoped lithium niobate laser crystal. Background technique [0002] Due to the combination of piezoelectric, ferroelectric, photoelectric, acoustoelectric and second-order optical nonlinear properties, lithium niobate crystals have been successfully used in integrated devices, such as optical modulators, acousto-optic modulators, etc. In addition, lithium niobate crystals can also be used as laser crystals. Compared with other laser crystal substrates, lithium niobate has more prominent application prospects. The nonlinear characteristics of the host crystal can realize the self-frequency doubling laser output of the crystal. Therefore, it has become a research hotspot for scientists in the past 10 years. However, the photoinduced refractive index effect of the lithium niobate crystal itself often limits i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/20H01S3/16
Inventor 张沛雄杭寅张连翰戴根发何明珠
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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