CN116282057B - Far infrared nonlinear optical crystal in sodium strontium boron sulfur and sodium strontium boron sulfur compounds, preparation method and application - Google Patents
Far infrared nonlinear optical crystal in sodium strontium boron sulfur and sodium strontium boron sulfur compounds, preparation method and application Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims abstract description 59
- -1 sodium strontium boron sulfur Chemical compound 0.000 title claims abstract description 42
- 230000003287 optical effect Effects 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 31
- 150000001875 compounds Chemical class 0.000 claims abstract description 22
- 239000011734 sodium Substances 0.000 claims abstract description 21
- 229910052796 boron Inorganic materials 0.000 claims abstract description 17
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 16
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 16
- ZEGFMFQPWDMMEP-UHFFFAOYSA-N strontium;sulfide Chemical compound [S-2].[Sr+2] ZEGFMFQPWDMMEP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 14
- 229910052979 sodium sulfide Inorganic materials 0.000 claims abstract description 14
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 239000011593 sulfur Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- 239000010453 quartz Substances 0.000 claims description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 3
- 239000002245 particle Substances 0.000 abstract description 4
- 238000002441 X-ray diffraction Methods 0.000 abstract description 2
- 238000003746 solid phase reaction Methods 0.000 abstract description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 229910052733 gallium Inorganic materials 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 125000004429 atom Chemical group 0.000 description 4
- 125000004434 sulfur atom Chemical group 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 125000004436 sodium atom Chemical group 0.000 description 2
- 235000003332 Ilex aquifolium Nutrition 0.000 description 1
- 235000002296 Ilex sandwicensis Nutrition 0.000 description 1
- 235000002294 Ilex volkensiana Nutrition 0.000 description 1
- 239000007836 KH2PO4 Substances 0.000 description 1
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 229910009372 YVO4 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001459 lithography Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 238000004467 single crystal X-ray diffraction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/08—Compounds containing boron and nitrogen, phosphorus, oxygen, sulfur, selenium or tellurium
- C01B35/14—Compounds containing boron and nitrogen, phosphorus, sulfur, selenium or tellurium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Glass Compositions (AREA)
Abstract
The invention relates to a compound sodium strontium boron sulfur and sodium strontium boron sulfur infrared nonlinear optical crystal, a preparation method and application thereof. The chemical formula of the compound is NaSrBS 3, the molecular weight is 217.60, the compound is sodium strontium boron sulfur monocrystal particles, the chemical formula of the crystal is NaSrBS 3, the molecular weight is 217.60, the crystal system is an orthorhombic system, the space group is P2 12121, the unit cell parameter a= 4.2542 (2) a, b= 10.8748 (3) a, c= 11.5712 (5) a, z=4, and the unit cell volume v=535.3 (0) a is 3. Solid-phase reaction is carried out on simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur under the vacuum condition; the pure sample XRD pattern of the sodium strontium boron sulfur infrared nonlinear optical crystal is consistent with a theoretical value; the sodium strontium boron sulfur infrared nonlinear optical crystal has a larger double refractive index; the frequency doubling effect was comparable to that of 0.5 times silver gallium sulfide (AGS) at 2090nm laser.
Description
Technical Field
The invention relates to a far infrared nonlinear optical crystal in sodium strontium boron sulfur and sodium strontium boron sulfur compounds, a preparation method and application thereof, and belongs to the field of infrared nonlinear optical crystal materials.
Background
Nonlinear optical (NLO) materials have many applications such as laser lithography, fiber optic communications, solid state laser systems, and the like. A large number of NLO materials are found in the Ultraviolet (UV) and Deep Ultraviolet (DUV) regions, such as KBe 2BO3F2、KH2PO4、KTiOPO4、β-BaB2O4, and LiB 3O5、CsB3O5,CsLiB6O10、α-BiB3O6 and Sr 2Be2B2O7. Birefringent materials are important optical functional materials that can be used to modulate the polarization of light, making optical devices such as opto-isolators, polarizing beam splitters, Q-switches, and circulators. To date, birefringent materials including LiNbO 3(420–5200nm),YVO4(400–5000nm),α-BaB2O4 (200-2500 nm) and CaCO 3 (350-2300 nm) have been commercially used in the ultraviolet and visible regions due to their excellent optical properties such as large birefringence, high laser damage threshold, wide ultraviolet and visible light transmission, and the ability to obtain high quality single crystals. In the Infrared (IR) region, there are some commercially available nonlinear optical materials such as AgGaS 2(AGS)、AgGaSe2 (AGSe) and ZnGeP 2 (ZGP). However, AGS has a low laser damage threshold, AGSe has a non-phase matching behaviour, ZGP generates severe two-photon absorption under ordinary pump light sources, these drawbacks limiting their further application. Therefore, research into infrared nonlinear optical materials and infrared birefringent materials having a large birefringence and a wide band gap are urgently required.
Disclosure of Invention
The invention aims to provide a compound sodium strontium boron sulfur and sodium strontium boron sulfur infrared nonlinear optical crystal, a preparation method and application thereof. The chemical formula of the compound is NaSrBS 3, the molecular weight is 217.60, the compound is sodium strontium boron sulfur monocrystal particles, the chemical formula of the crystal is NaSrBS 3, the molecular weight is 217.60, the crystal system is an orthorhombic system, the space group is P2 12121, and the unit cell parameters are thatZ=4, unit cell volume/>Solid-phase reaction is carried out on simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur under the vacuum condition; the XRD pattern of the sodium strontium boron sulfur infrared nonlinear optical crystal disclosed by the invention is identical with a theoretical value.
The chemical formula of the compound is NaSrBS 3, the molecular weight is 217.60, the compound is sodium strontium boron sulfur monocrystal particles, the monocrystal is of a non-centrosymmetric structure, the crystal system is an orthorhombic system, the space group is P2 12121, and the unit cell parameters are as followsZ=4, unit cell volume
A far infrared nonlinear optical crystal in sodium strontium boron sulfur has chemical formula of NaSrBS 3, molecular weight of 217.60, non-centrosymmetric single crystal, orthorhombic crystal system, space group of P2 12121, and unit cell parameter Z=4, unit cell volume
The preparation method of the far infrared nonlinear optical crystal in sodium strontium boron sulfur comprises the following steps:
a. In a glove box filled with inert gas of argon in a closed container with water content and oxygen content of 0.01-0.1ppm, weighing elemental sodium, sodium sulfide and strontium sulfide according to a molar ratio of Na: sr: B: S element of 2:1:2:6, and elemental boron and elemental sulfur;
b. Uniformly mixing the simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -5-10-3 Pa, and sealing the quartz tube;
c. c, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 750-830 ℃ at a heating rate of 17-21 ℃/h, and preserving heat for 89-96h to obtain a compound;
d. And c, cooling the compound in the step c at a speed of 0.2-0.3 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3.
In step c the vacuum vessel was warmed to 810 ℃.
And d, cooling at a cooling rate of 0.2 ℃/h.
The far infrared nonlinear optical crystal in sodium strontium boron sulfur is used for preparing infrared band laser variable frequency crystal, infrared electric-optical device, infrared communication device or infrared laser guidance device.
The far infrared nonlinear optical crystal in the sodium strontium boron sulfur and the sodium strontium boron sulfur compounds and the preparation method and application thereof are characterized in that the valence of Na atoms, sr atoms, B atoms and S atoms in the crystal structure are +1, +2, +3 and-2 respectively. Na atoms form [ NaS 6 ] with adjacent six S atoms; the Sr atom forms [ SrS 7 ] with the seven adjacent S atoms; b atoms and adjacent three S atoms form [ BS 3].[NaS6 ] to form a ∞[NaS3]n chain-shaped structure through joint edge connection, ∞[NaS3]n chains are connected through isolated [ BS 3 ] to form a three-dimensional network structure, and Sr 2+ is filled between pore channels. The sodium strontium boron sulfur compound is sodium strontium boron sulfur monocrystal particles.
Drawings
FIG. 1 is a graph of the X-ray powder diffraction pattern of a polycrystalline powder of the present invention versus theoretical values.
FIG. 2 is a block diagram of a single crystal of the present invention NaSrBS 3.
FIG. 3 is a graph of refractive index dispersion and theoretical birefringence of a single crystal of the present invention NaSrBS 3.
FIG. 4 is a schematic diagram of a wedge-shaped birefringent crystal polarizing beam splitter according to the present invention, wherein 1 is incident light, 2 is o light, 3 is e light, 4 is the optical axis, and 5 is NaSrBS 3 crystals;
FIG. 5 is a schematic view of an optical isolator according to the present invention, wherein 6 is the transmission direction;
Fig. 6 is a schematic diagram of the operation of the far infrared nonlinear optical crystal in NaSrBS 3 of the present invention, in which 1 is a laser, 2 is an emitted beam, 3 is NaSrBS 3 crystal, 4 is an emitted beam, and 5 is a filter.
Detailed Description
The invention is illustrated in detail by the following examples. But is not limited to the following examples.
Example 1
Preparation of sodium strontium boron sulfur compound:
a. weighing elemental sodium, sodium sulfide, strontium sulfide, elemental boron and elemental sulfur in a molar ratio of 2:1:2:4:7 in a closed container of a glove box filled with inert gas of argon, wherein the water content and the oxygen content are 0.01-0.1 ppm;
b. Uniformly mixing the simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -5 Pa, and sealing the quartz tube;
c. C, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 810 ℃ at a heating rate of 15 ℃/h, and preserving heat for 37 hours to obtain a compound;
d. Cooling the compound in the step c at a speed of 0.2 ℃/h to obtain colorless transparent bulk crystals, wherein the colorless transparent bulk crystals are shown to be sodium strontium boron sulfur NaSrBS 3 by single crystal X-ray diffraction analysis, and the unit cell parameters are as follows Beta= 100.627 °, Z=4, the molecular weight is 217.60, the orthorhombic system belongs to the space group P2 12121, and the structure is shown in figure 1.
Example 2
Preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur according to a reaction type Na 2S+2SrS+2B+3S→NaSrBS3:
a. Weighing sodium sulfide, strontium sulfide, elemental boron and elemental sulfur in a molar ratio of 1:2:2:3 in a closed container of a glove box filled with inert gas of argon gas, wherein the water content and the oxygen content are both 0.01-0.1 ppm;
b. Uniformly mixing sodium sulfide, strontium sulfide, elemental boron and elemental sulfur in the step a, putting into a clean graphite crucible, then putting into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -3 Pa, and sealing;
c. C, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 750 ℃ at a heating rate of 20 ℃/h, and preserving heat for 96 hours to obtain a compound;
d. and c, cooling the compound in the step c at a speed of 0.3 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3 with the size of 1x0.2 mm 3.
Example 3
Preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur according to the reaction formula Na+SrS+B+2S- & gt NaSrBS 3:
a. Weighing elemental sodium, strontium sulfide, elemental boron and elemental sulfur in a molar ratio of 1:1:1:2 in a closed container of a glove box filled with inert gas of argon, wherein the water content and the oxygen content are 0.01-0.1 ppm;
b. uniformly mixing the simple substance sodium, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -3 Pa, and sealing the quartz tube;
c. C, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 830 ℃ at a heating rate of 21 ℃/h, and preserving heat for 89 hours to obtain a compound;
d. And c, cooling the compound in the step c at a speed of 0.2 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3 with the size of 1x0.2 mm 3.
Example 4
According to the reaction formula: na+Na 2S+SrS+B+S→NaSrBS3 is used for preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur:
a. Weighing elemental sodium, sodium sulfide, strontium sulfide, elemental boron and elemental sulfur in a closed container of a glove box filled with inert gas of argon gas and having water content and oxygen content of 0.01-0.1ppm according to a molar ratio of Na to Sr to B to S of 2:1:2:6;
b. Mixing the simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -3 Pa, and sealing the quartz tube;
c. C, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 800 ℃ at a heating rate of 17 ℃/h, and preserving heat for 90 hours to obtain a compound;
d. And c, cooling the new compound in the step c at the speed of 0.2 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3 with the size of 1x0.2 mm 3.
Example 5
According to the reaction formula: na+Na 2S+SrS+B+S→NaSrBS3 is used for preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur:
a. In a closed container of a glove box filled with inert gas of argon gas and having water content and oxygen content of 0.01-0.1ppm, the molar ratio of Na, sr, B and S elements is as follows: 1:1:1:3, weighing sodium, sodium sulfide, strontium sulfide, boron and sulfur;
b. Mixing the simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -3 Pa, and sealing the quartz tube;
c. C, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 810 ℃ at a heating rate of 17 ℃/h, and preserving heat for 96 hours to obtain a compound;
d. and c, cooling the compound in the step c at a speed of 0.3 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3 with the size of 1x0.2 mm 3.
Example 6
The NaSrBS 3 crystals obtained in examples 2-5 are used for preparing a wedge-shaped birefringent crystal polarization beam splitter, a wedge-shaped birefringent crystal is arranged, the optical axis orientation is shown in figure 4, one natural light beam can be divided into two linearly polarized light beams through the crystal after incidence, and the greater the birefringence, the farther the two light beams can be separated, so that the light beam separation is facilitated.
Example 7
Any NaSrBS 3 crystal obtained in examples 2-5 is used for preparing a beam shifter, a birefringent crystal is processed, the optical axis surface of the birefringent crystal forms an angle theta with the edge (shown in figure 5 a), after natural light is vertically incident, the birefringent crystal can be divided into two linearly polarized lights (shown in figure 5 b) with mutually perpendicular vibration directions, namely o light and e light respectively, and the greater the double-refraction ratio is, the farther the two lights can be separated, so that the separation of the light beams is facilitated.
Example 8
Any of the sodium strontium boron sulfur crystals obtained in examples 2-5 was placed at the position of 3 as shown in FIG. 6, at room temperature, a clear 1045nm frequency doubling light output was observed by using 2090nm output of a Q-switched Ho: tm: cr: YAG laser as a light source, the output intensity was equal to that of the same condition AgGaS 2, FIG. 6 shows that an infrared light beam with a wavelength of 2090nm emitted from a Q-switched Ho: tm: cr: YAG laser 1 was injected into a sodium strontium boron sulfur nonlinear optical crystal through a holly lens 2 to generate frequency doubling light with a wavelength of 1045nm, and an outgoing light beam 4 containing infrared light with a wavelength of 2090nm and light with a wavelength of 1045nm was filtered by a filter 5 to obtain frequency doubling light with a wavelength of 1045 nm.
Claims (5)
1. The far infrared nonlinear optical crystal in sodium strontium boron sulfur is characterized in that the chemical formula of the crystal is NaSrBS 3, the molecular weight is 217.60, the crystal system is an orthorhombic system, the space group is P2 12121, the unit cell parameters are a= 4.2542 (2) a, b= 10.8748 (3) a, c= 11.5712 (5) a, Z=4, and the unit cell volume V=535.3 (0) a 3.
2. The method for preparing the far infrared nonlinear optical crystal in sodium strontium boron sulfur as set forth in claim 1, which is characterized by comprising the following steps:
a. In a glove box filled with inert gas of argon in a closed container with water content and oxygen content of 0.01-0.1ppm, weighing elemental sodium, sodium sulfide and strontium sulfide according to a molar ratio of Na: sr: B: S element of 2:1:2:6, and elemental boron and elemental sulfur;
b. Uniformly mixing the simple substance sodium, sodium sulfide, strontium sulfide, simple substance boron and simple substance sulfur in the step a, putting the mixture into a clean graphite crucible, then putting the clean graphite crucible into a quartz glass tube, vacuumizing the quartz tube at the vacuum degree of 10 -5-10-3 Pa, and sealing the quartz tube;
c. c, placing the sealed quartz tube in the step b into a high-temperature furnace, heating to 750-830 ℃ at a heating rate of 17-21 ℃/h, and preserving heat for 89-96h to obtain a compound;
d. And c, cooling the compound in the step c at a speed of 0.2-0.3 ℃/h to obtain the far infrared nonlinear optical crystal in the sodium strontium boron sulfur NaSrBS 3.
3. The method for preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur as set forth in claim 2, wherein the vacuum vessel is heated to 810 ℃ in step c.
4. The method for preparing a far infrared nonlinear optical crystal in sodium strontium boron sulfur as set forth in claim 2, wherein the cooling rate in the step d is 0.2 ℃/h.
5. The use of a far infrared nonlinear optical crystal in sodium strontium boron sulfur as set forth in claim 1 in the preparation of an infrared band laser frequency conversion crystal, an infrared electro-optic device, an infrared communication device or an infrared laser guidance device.
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