A kind of mid-infrared nonlinear optical crystal, its preparation method and application
A technology of nonlinear optics and nonlinear crystals, applied in chemical instruments and methods, crystal growth, self-solid, etc., can solve problems such as low laser damage threshold and cannot meet the needs of practical applications, and achieve excellent second-order nonlinear optical properties Effect
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Embodiment 1
[0045] The preparation of embodiment 1 sample
[0046] BaCl 2 , metal barium powder, metal M, metal gallium powder and selenium powder are mixed evenly according to a certain ratio to obtain the raw material; the raw material is put into a graphite crucible; the graphite crucible with the raw material is placed in a quartz reaction tube, and the vacuum is pumped to 10 -2 Pa and use a hydrogen-oxygen flame to melt and seal the quartz reaction tube. Put the quartz reaction tube into a tube furnace with a temperature controller, heat it to the solid melting temperature, and keep it for a period of time. Then the temperature is programmatically lowered to 300° C. at a speed not exceeding 5° C. / hour, then the heating is stopped, and the nonlinear optical crystal material is obtained by naturally cooling to room temperature.
[0047] The sample number, raw material ratio, solid solution temperature and holding time are shown in Table 1.
[0048] Table 1
[0049]
Embodiment 2
[0050] The structural characterization of embodiment 2 sample
[0051] sample 1 # ~6 # The X-ray single crystal diffraction was carried out on a Mercury CCD type single crystal diffractometer, Mo target, Kα radiation source (λ=0.07107nm), test temperature 293K. And through Shelxtl97 for structural analysis. The crystallographic data results of each sample are shown in Table 2, and the schematic diagram of the crystal structure is shown in figure 1 shown.
[0052] Table 2 Sample 1 # ~6 # The crystallographic data of
[0053]
[0054] It can be seen that sample 1 # ~6 # have the same crystal structure, and the structure is mainly composed of a three-dimensional grid structure formed by symmetrical T1 tetrahedra and T2 hypertetrahedrons alternately connected to each other by sharing Se, Ba 2+ and Cl - Fill in the cavities of the 3D mesh. where T1 is MSe 4 6- Tetrahedral, T2 is composed of four GaSe 4 5- Tetrahedral [Ga 4 Se 10 ] 8- .
[0055] sample 1 # ~6 ...
Embodiment 3
[0056] Optical property characterization of embodiment 3 sample
[0057] sample 1 # ~6 # The optical properties of the optical properties were characterized on a Nicolet Magna 750FT-IR infrared spectrometer and a PE Lambda900 ultraviolet-visible (near-infrared) absorption or diffuse reflectance spectrometer, and the results are shown in Table 3.
[0058] sample 1 # ~4 # light transmission properties such as Figure 4 As shown, the multiplier performance is as Figure 5 As shown, the fluorescence performance as Figure 6 shown.
[0059] It can be seen that the 1 obtained by the effective dual-ion cooperative substitution method provided by the present application # ~6 # The sample realizes the compound function of the material. For example, Ba 4 Cu 0.5 Ga 4.5 Se 10 Cl 2 The compound has achieved second-order nonlinearity (under 2.05 μm laser excitation, its powder frequency doubling intensity is 39 times that of AGS) and the emission wavelength of the T1-T2 skelet...
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