Deep-ultraviolet nonlinear optical crystal barium zinc fluorophosphate and preparation method and application thereof
A technology of nonlinear optics and zinc fluorophosphate, applied in the fields of nonlinear optics, chemical instruments and methods, optics, etc., can solve the problems of low frequency multiplication coefficient of crystals, long time consumption, high energy consumption, etc., and achieve good thermal stability , Simple operation, and the effect of reducing energy consumption
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[0022] Example 1
[0023] ZnCl 2 , Ba(CH 3 COO) 2 , LiF, H 3 PO 4 The molar ratio of triethylamine is 0.5:1:6:21.9:14.9. It is mixed in a high-pressure hydrothermal reaction kettle and placed in an oven at 210℃ for 5 days. After the product is naturally cooled to room temperature, the product is washed to obtain colorless and transparent crystals. After selecting one, perform single crystal X-ray diffraction test. After analysis, single crystal data is obtained, which belongs to a non-centrosymmetric crystal structure and is drawn into a crystal structure diagram. See figure 2 , And then the compound is ground into a powder and the powder XRD pattern is measured, see figure 1 , The measured spectrum is consistent with the theoretical calculated spectrum of the single crystal.
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[0024] Example 2
[0025] ZnCl 2 , Ba(NO 3 ) 2 , NaF, H 3 PO 4 , Ethylenediamine is mixed with a molar ratio of 1:2:4:21.9:14.9, placed in a high-pressure hydrothermal reaction kettle, placed in an oven at 180°C, and kept at a constant temperature for 3 days. After the product is naturally cooled to room temperature, the product is washed to obtain colorless and transparent crystals. After testing powder X-ray diffraction, perform ultraviolet-visible diffuse reflectance spectroscopy test, see image 3 , The transmittance is 46% at 190nm, it can be seen that its cut-off absorption edge is below 190nm, which belongs to the deep ultraviolet region, so it can be applied to the laser field of coherent light output in the deep ultraviolet region.
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[0026] Example 3
[0027] Zn(CH 3 COO) 2 , BaCl 2 , KF, H 3 PO 4 , Tri-n-propylamine is mixed with a molar ratio of 1:1:6:14.6:14.9, placed in a high-pressure hydrothermal reactor, placed in an oven at 240°C, and kept at a constant temperature for 3 days. After the product is naturally cooled to room temperature, the product is washed to obtain colorless and transparent crystals. Take 1g sample to screen the particle size grouping and then conduct the second harmonic effect test, and use the same particle size potassium dihydrogen phosphate (KH 2 PO 4 , KDP) as the standard sample to obtain the phase matching diagram see Figure 4 , With the increase of particles, the intensity increases correspondingly, reaching 0.25 times the KDP intensity at 150-200μm.
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