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NaSr3Be3B3O9F4 nonlinear optical crystal, its growth method and application thereof

A technology of nonlinear optics and growth method, applied in the field of optoelectronic functional materials and growth, can solve the problems of inability to generate harmonic light, small birefringence, small devices, etc., and achieve the effect of convenient and fast growth method

Inactive Publication Date: 2014-12-10
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

However, the effective frequency-doubling output wavelengths of these three crystals are limited in the ultraviolet spectral region.
For BBO, due to (1)(B 3 o 6 ) group has a large conjugated π orbital characteristic, which red-shifts the band gap of the group, which leads to the absorption edge of the BBO crystal at 189nm; (2) limited by the ultraviolet absorption edge, the crystal cannot produce Harmonic light; (3) planar (B 3 o 6 ) group leads to the birefringence Δn≈0.12 of the BBO crystal, and the large birefringence makes the acceptance angle of the BBO crystal at the quadruple frequency Δθ=0.45mrad*cm, which is too small for practical devices
As for LBO, because the birefringence is too small, phase matching cannot be achieved in a shorter wavelength band to produce effective frequency-doubling optical output

Method used

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  • NaSr3Be3B3O9F4 nonlinear optical crystal, its growth method and application thereof
  • NaSr3Be3B3O9F4 nonlinear optical crystal, its growth method and application thereof
  • NaSr3Be3B3O9F4 nonlinear optical crystal, its growth method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis of NaSr 3 be 3 B 3 o 9 f 4 The dosage of reagents used:

[0032]

[0033] The specific operation steps are as follows:

[0034] Accurately weigh in the operation box according to the above mass, put into the agate mortar, mix well and grind carefully, then put into Put it into a platinum crucible with a cover, compact it, put it into a muffle furnace (the muffle furnace is placed in a fume hood, the exhaust of the fume hood is passed into the water tank, and is discharged after filtration), and the temperature is slowly raised to 730°C for sintering for 48 hour, the heating rate must be slow at the beginning to prevent the change of the proportion due to decomposition, so that the solid phase reaction can fully proceed. In the furnace, the end point of the reaction was ignited at 730°C to constant weight, and the product was confirmed to be NaSr by powder X-ray diffraction. 3 be 3 B 3 o 9 f 4 Compound in pure phase.

Embodiment 2

[0037] NSBBF crystal growth adopts the molten salt method, the crystal growth device is a resistance wire heating furnace, and the temperature control equipment is an A1-708P type programmable automatic temperature controller; the specific operation is: select NSBBF (the product obtained in Example 1) or synthesize The raw material of the corresponding NSBBF compound, then add the flux (B 2 o 3 , NaF and SrF 2 The mixture of composition) is prepared according to the following ratio, 1mole NSBBF or the raw material (1.5mole SrCO 3 , 3mole BeO, 3mole H 3 BO 3 , 1mole NaF, 1.3mole SrF 2 ), then add co-solvent (1mole B 2 o 3 , 5 mole NaF and 1 mole SrF 2 Composition mixture), put it into a platinum crucible, then put it into a resistance wire heating furnace, raise the temperature to 850°C at a heating rate of 10°C / hour, keep the temperature for 40 hours until the material is fully melted, and cool down to 2°C above the saturation temperature to obtain High-temperature sol...

Embodiment 3

[0039] NSBBF crystal growth adopts the molten salt method, the crystal growth device is a resistance wire heating furnace, and the temperature control equipment is an A1-708P type programmable automatic temperature controller; the specific operation is: select NSBBF (the product obtained in Example 1) or synthesize The raw material of the corresponding NSBBF compound, then add the flux (B 2 o 3 , NaF and SrF 2 Composition mixture), prepared according to the following ratio: 1mole NSBBF or use the raw material for synthesizing 1mole NSBBF (1.5mole SrCO 3 , 3mole BeO, 3mole H 3 BO 3 , 1mole NaF and 1.3mole SrF 2 ), then add co-solvent (0.5moleB 2 o 3 , 3.5mole NaF and 0.4mole SrF 2 ); put it into a platinum crucible, then put it into a self-made electric resistance wire heating furnace, raise the temperature to 850°C at a heating rate of 30°C / hour, keep the temperature at a constant temperature for 10 hours until the material is fully melted, and cool down to 10°C above t...

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Abstract

A NaSr3Be3B3O9F4 nonlinear optical crystal is prepared by a molten salt growth method as follows: uniformly mixing NaSr3Be3B3O9F4 and a fluxing agent in proportion, heating to 850 DEG C, cooling to 2-10 DEG C higher than saturation temperature after reaching constant temperature so as to obtain a high-temperature solution; putting a seed crystal into the high-temperature solution, rotating the seed rod, cooling to the saturation temperature, slowly cooling, lifting the obtained crystal out of the liquid level and cooling to room temperature so as to obtain the NaSr3Be3B3O9F4 nonlinear optical crystal. The crystal has a nonlinear optical effect and wide light transmission band. Ultraviolet cutoff edge reaches 170 nm. The crystal doesn't resolve in water, has good chemical stability, is suitable for laser frequency conversion requirements of ultraviolet band, can be used to manufacture nonlinear optical devices and harmonic light output devices for realizing 2 octaves, 3 octaves, 4 octaves, 5 octaves or 6 octaves of Nd:YAG laser, and also can be used in harmonic light output devices of other laser wavelength to generate coherent light with its wavelength being equal to or less than 266nm for output.

Description

technical field [0001] The present invention relates to an optoelectronic functional material and its growth method and use, in particular to a nonlinear optical material and its preparation method and use, in particular to a fluoroborate beryllium salt (NaSr 3 be 3 B 3 o 9 f 4 ) nonlinear optical crystal and its growth method and application. The sodium strontium fluoroborate beryllium (NaSr 3 be 3 B 3 o 9 f 4 ) referred to as NSBBF. Background technique [0002] The nonlinear optical effect of crystal refers to such an effect: when a laser beam with a certain polarization direction and a certain incident direction passes through a nonlinear optical crystal (such as NSBBF of the present invention), the frequency of the laser beam will change. figure 1 and figure 2 A typical schematic diagram of this effect. [0003] Crystals with nonlinear optical effects are called nonlinear optical crystals. Here nonlinear optical effects refer to effects such as frequency d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B9/12G02F1/355G02F1/39
Inventor 陈创天黄洪伟姚吉勇王晓洋
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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