Nonlinear optical device comprising potassium sodium niobate single crystal

A nonlinear optics, potassium sodium niobate technology, applied in the field of optoelectronic functional materials, can solve problems such as difficulty in obtaining high optical quality large-size single crystals, difficulty in completely covering the atmospheric window, and inability to control growth parameters in real time, achieving large laser damage. Threshold, wide optical transmission wavelength range, no cracking issues

Active Publication Date: 2022-05-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these infrared crystals are grown by the Bridgman method. The whole growth process is carried out in a closed furnace, and the growth details cannot be observed. The growth parameters cannot be controlled in real time, and it is difficult to obtain large-sized single crystals with high optical quality.
[0005] Non-linear oxide crystals have a wide band gap and laser damage threshold, which makes up for the disadvantages of the above non-oxide crystals, but due to the high phonon frequency generated by oxygen atoms, it is difficult for them to completely cover the 3-5 μm atmospheric window

Method used

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  • Nonlinear optical device comprising potassium sodium niobate single crystal
  • Nonlinear optical device comprising potassium sodium niobate single crystal
  • Nonlinear optical device comprising potassium sodium niobate single crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: K 0.8 Na 0.2 NbO 3 Single crystal preparation

[0051] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 and Nb 2 o 5 The raw materials are weighed according to the stoichiometric ratio x=0.8, y=0, z=0, and then placed in vacuum drying at 120°C, and the polycrystalline potassium sodium niobate is synthesized by solid-phase sintering method, the solid-phase sintering temperature is 950°C, and the sintering The time is 20 hours; X-ray powder diffraction test is carried out to the prepared polycrystalline phase, test result is as follows image 3 As shown, it can be seen from the figure that the experimental value is consistent with the theoretical value, indicating that the obtained powder sample is a pure phase.

[0052] Put the obtained polycrystalline material into a platinum crucible, put it into a pulling furnace, and vacuumize the furnace cavity to 1×10 -4 Pa, fill with Ar to an atmospheric pressure, raise the temperature to melt the raw materials slo...

Embodiment 2

[0055] Example 2: Li 0.05 K 0.475 Na 0.475 NbO 3 Single crystal preparation

[0056] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 and Nb 2 o 5 Raw material according to stoichiometric ratio Li 0.05 K 0.475 Na 0.475 NbO 3 After weighing, it was placed in vacuum drying at 120° C., and the potassium sodium niobate polycrystalline material was synthesized by a solid-state sintering method.

[0057] Add the obtained polycrystalline material to the platinum crucible, and vacuumize until the obtained polycrystalline material is added to the platinum crucible, and vacuumize to 1×10 -4 Pa, filled with Ar+1%O 2 To an atmospheric pressure, raise the temperature to slowly melt the raw materials, and keep the temperature constant for 2 hours after all the raw materials are melted. After adjusting the seeding temperature, the potassium sodium niobate seed crystal is slowly lowered to the surface of the melt for shoulder and equal-diameter growth. The crystals are stripped as ...

Embodiment 3

[0058] Example 3: Li 0.05 K 0.475 Na 0.475 Sb 0.02 Nb 0.98 o 3 Single crystal preparation

[0059] Na with a purity of 99.99% 2 CO 3 、K 2 CO 3 and Nb 2 o 5 Raw material according to metering ratio Li 0.05 K 0.475 Na 0.475 Sb 0.02 Nb 0.98 o 3 After weighing, it was placed in vacuum drying at 120° C., and the potassium sodium niobate polycrystalline material was synthesized by a solid-state sintering method.

[0060] Add the obtained polycrystalline material to the platinum crucible, and vacuumize until the obtained polycrystalline material is added to the platinum crucible, and vacuumize to 1×10 -4 Pa, filled with Ar to an atmospheric pressure, raised the temperature to slowly melt the raw materials, and kept the temperature for 2 hours after all the raw materials were melted. After adjusting the seeding temperature, the potassium sodium niobate seed crystal is slowly lowered to the surface of the melt for shoulder and equal-diameter growth. The crystals are ...

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Abstract

The invention relates to an infrared nonlinear optical crystal potassium sodium niobate as well as a preparation method and application thereof. The molecular formula of the potassium sodium niobate is (Na (1-x-y) KxAy) (Nb1-zBz) O3, x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 0.2, z is more than or equal to 0 and less than or equal to 0.5, and A is Li, Ag, Ca, Ba, Sr or Sc; b is Ta, Sb, Mn or Zr), has a perovskite structure, belongs to an orthorhombic system, has a space group of A < 2 >, and is prepared by adopting a top seed crystal method. The potassium-sodium niobate crystal has good non-linear optical performance, the transmission range of the potassium-sodium niobate crystal is measured to reach 0.37-8 [mu] m through experiments, the powder frequency doubling strength of the potassium-sodium niobate crystal is about 7.6 times that of KTiOPO4, and the laser damage threshold is 98.9 MW / cm < 2 >. The method is expected to have important application value in the high-tech fields of laser guidance, laser directional infrared interference, laser communication, infrared remote sensing, thermal infrared imagers, infrared distance measurement, laser aiming and the like.

Description

technical field [0001] The invention relates to a nonlinear optical device containing potassium sodium niobate single crystal, and belongs to the technical field of optoelectronic functional materials. Background technique [0002] With the development of modern laser technology, the laser wavelength that can be directly obtained by using laser crystals is limited, and it is impossible to achieve full-band laser output. Due to its unique nonlinear effects, nonlinear optical crystals, such as frequency doubling, sum frequency, difference frequency, Parametric amplification, etc., can effectively broaden the wavelength range of the laser. Using the nonlinear effect of crystals can be used to make a variety of nonlinear optical devices such as second harmonic generators, up-down frequency converters, and optical parametric oscillators. The electromagnetic radiation generated by the laser can be converted in frequency by nonlinear optical devices, so as to obtain more electroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B27/02C30B28/02G02F1/355
CPCC30B29/30C30B27/02C30B28/02G02F1/3551
Inventor 付秀伟刘蕾贾志泰尹芳艺陶绪堂
Owner SHANDONG UNIV
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