Compound strontium borate nitrate and strontium borate nitrate nonlinear optical crystal, preparation method and use thereof

Abstract

This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. The chemical formula of the compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was prepared using a vacuum-sealed tube method; the chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a =11.2574(9)Å, b =6.6400(9)Å, c =18.1027(13)Å, Z=4, V=1348.9(2)Å 3 It is prepared using a high-temperature melt method or hydrothermal method under vacuum sealing conditions. Its nonlinear optical effect is approximately three times that of KDP, and its birefringence is 0.088@546 nm. This method has advantages such as simple preparation, short growth cycle, low toxicity of starting materials, and minimal harm to humans. Sr3B9O obtained by the method described in this invention... 16 (NO3) Nonlinear optical crystals have stable physicochemical properties, large nonlinear effects, and can be applied to phase-matching wavelengths in the ultraviolet band. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

Description

Technical Field

[0001] This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. Background Technology

[0002] In recent years, research and development of second-order nonlinear optical crystal materials have yielded new results in fields such as laser-driven interference lithography, precision micromachining, and nanosecond and picosecond pulse generation. Since Franken et al. first observed the second harmonic radiation of a ruby ​​laser in a quartz crystal in 1961, nonlinear optics, as an important branch of modern optics, has made significant progress. Given the extremely limited number of natural crystals exhibiting significant nonlinear optical effects, many chemists and materials scientists have focused on the artificial synthesis of nonlinear optical materials, hoping to obtain materials with excellent optical properties. In the visible to near-infrared spectral range, the research and application of nonlinear optical crystal materials have matured, with representative materials such as KTiOPO4 (KTP) and KH2PO4 (KDP). For infrared applications, commercially available nonlinear optical crystals include AgGaS2, AgGaSe2, and ZnGeP2.

[0003] In the ultraviolet band, the industrialized nonlinear optical crystals LiB3O5 (LBO), CsB3O5 (CBO), and CsLiB6O 10 KBBF family crystals, such as CLBO and BaB₂O₄ (BBO), are the third Chinese-developed nonlinear optical crystal discovered in my country, following BBO and LBO crystals. This discovery has played a pioneering role in promoting the development and application of all-solid-state deep ultraviolet laser sources and fully demonstrates my country's continued international leadership in the field of nonlinear optical crystals. Research shows that borate systems, due to their diverse structural types, tendency to crystallize in non-centrosymmetric space groups, and excellent comprehensive optical properties, have rapidly become an important material source for the design of ultraviolet nonlinear optical crystals. The search for and development of novel ultraviolet nonlinear optical crystals with excellent comprehensive performance within borate systems remains a key research direction in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a compound, strontium borate nitrate, with the chemical formula Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was produced using a vacuum sealing method.

[0005] Another objective of this invention is to provide a strontium borate nitrate nonlinear optical crystal with a large nonlinear coefficient, a short phase-matching wavelength, easy preparation, and good stability. The chemical formula of this crystal is Sr3B9O. 16(NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a = 11.2574(9) Å, b = 6.6400(9) Å, c = 18.1027(13) Å, Z = 4, V = 1348.9(2) Å 3 Shortest phase-matching wavelength

[0006] Another object of the present invention is to provide a method for preparing a strontium borate nitrate nonlinear optical crystal.

[0007] Another object of the present invention is to provide the use of strontium borate nitrate nonlinear optical crystals.

[0008] The present invention discloses a compound, strontium borate nitrate, with the chemical formula Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was produced using a vacuum sealing method.

[0009] The compound strontium borate nitrate is prepared by a vacuum sealing method, and the specific operation is carried out according to the following steps:

[0010] Mix the Sr-containing, B-containing, and N-containing compounds thoroughly according to the molar ratio Sr:B:N = 2-4:8-11:0.5-2, and pack the mixture into a 10 mm × 100 mm quartz tube. Evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. −3 The mixture is placed in a muffle furnace under high temperature and sealed with a flame. The temperature is increased to 500-750℃ at a rate of 10-50℃ / h, held at this temperature for 1-10 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3), of which Sr-containing compounds are Sr(NO3)2, SrCO3 or SrO, B-containing compounds are H3BO3 or B2O3, and N-containing compounds are Sr(NO3)2.

[0011] A nonlinear optical crystal of strontium borate and nitrate, the chemical formula of which is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of [missing information]. Cc The unit cell parameters are a = 11.2574(9) Å, b = 6.6400(9)Å, c = 18.1027(13) Å, Z = 4, V = 1348.9(2) Å 3 .

[0012] The preparation method of the strontium borate nitrate nonlinear optical crystal employs a high-temperature melt method or a hydrothermal method under vacuum sealing conditions.

[0013] Crystals were prepared using a high-temperature melt method under vacuum sealing conditions. The specific operation was carried out according to the following steps:

[0014] a. Grind the Sr-containing compound, B-containing compound, and N-containing compound thoroughly in a mortar and mix them evenly according to the molar ratio Sr:B:N = 2-4:8-11:0.5-2; wherein the Sr-containing compound is Sr(NO3)2, SrCO3, or SrO, the B-containing compound is H3BO3 or B2O3, and the N-containing compound is Sr(NO3)2.

[0015] b. Place the mixture from step a into a 10 mm × 100 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. −3 Pa, sealed under a high-temperature flame, placed in a muffle furnace, heated to 500-750℃ at a rate of 10-50℃ / h, held at the temperature for 1-10 days, and then cooled to room temperature at a rate of 0.1-2℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal.

[0016] The crystals were prepared using a hydrothermal method, and the specific procedures are as follows:

[0017] a. Mix the Sr-containing compound, B-containing compound, and N-containing compound evenly in a molar ratio of Sr:B:N = 2-4:8-11:0.5-2, transfer the mixture to a PTFE-lined high-pressure reactor with a volume of 25-100 mL, add 1.5-3 mL of deionized water, and tighten and seal the reactor. The Sr-containing compound is Sr(NO3)2 or SrO, the B-containing compound is H3BO3 or B2O3, and the N-containing compound is Sr(NO3)2.

[0018] b. Place the high-pressure reactor from step a in an oven and heat it to 170-220℃ at a rate of 20-60℃ / h. Maintain the temperature for 3-15 days, then cool it down to room temperature at a rate of 10-100℃ / day. Open the high-pressure reactor and obtain the strontium borate nitrate nonlinear optical crystal from the clarified solution.

[0019] The application of the strontium borate nitrate nonlinear optical crystal in the preparation of frequency doubling generators and optical parametric oscillators.

[0020] The strontium borate nitrate nonlinear optical crystal of this invention has the molecular formula Sr3B9O. 16 (NO3), its nonlinear optical effect is about 3 times that of KDP, its birefringence is 0.088@546 nm, and its space group is... CcThis crystal is simple to prepare, has a short growth cycle, and uses low-toxicity starting materials, making it less harmful to the human body.

[0021] The preparation method of the strontium borate nitrate nonlinear optical crystal of the present invention is a high-temperature melt method or hydrothermal method under vacuum sealing conditions. That is, the starting raw materials are mixed in proportion and placed in a vacuum quartz tube or a polytetrafluoroethylene liner of a high-pressure reactor with a volume of 25-100 mL. By maintaining a constant temperature and cooling rate within a certain temperature range, the strontium borate nitrate nonlinear optical crystal is obtained.

[0022] The strontium borate nitrate nonlinear optical crystal of the present invention contains Sr, B, and N compounds, which can be obtained using commercially available reagents and raw materials. The crystal growth method is simple and transparent, and has the advantages of simple operation, fast growth rate, and low cost.

[0023] The strontium borate nitrate nonlinear optical crystal has no special requirements for optical processing precision. Attached Figure Description

[0024] Figure 1 The powder X-ray diffraction pattern of this invention;

[0025] Figure 2 The present invention is Sr3B9O 16 Structural diagram of (NO3) crystal;

[0026] Figure 3 The present invention is Sr3B9O 16 (NO3) A photograph of a micron-sized crystal under a polarizing microscope;

[0027] Figure 4 The working principle diagram of the nonlinear optical device fabricated for this invention includes (1) a laser, (2) a full-focus lens, (3) a strontium borate nitrate nonlinear optical crystal, (4) a beam splitter, (5) a filter, and ω is the frequency of the refracted light, which is equal to or twice the frequency of the incident light. Detailed Implementation

[0028] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. The present invention will be further described below with reference to the embodiments. It should be noted that the present invention is not limited to the embodiments listed. Any improvement made on the basis of the present invention does not violate the spirit of the present invention. Unless otherwise specified, the raw materials or equipment used in the present invention are commercially available. Example 1

[0029] The chemical reaction is 3Sr(NO3)2 + 4.5B2O3 = Sr3B9O 16(NO3) + 5NO2↑ + 1.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0030] Sr(NO3)2 and B2O3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was placed in a muffle furnace under high temperature and sealed with a flame. The temperature was increased to 500℃ at a rate of 10℃ / h, held for one day, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 2

[0031] The chemical reaction is 3Sr(NO3)2 + 9H3BO3 = Sr3B9O 16 (NO3) + 5NO2↑ + 13.5H2O↑ + 1.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0032] Sr(NO3)2 and H3BO3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was sealed in a flame at high temperature and placed in a muffle furnace. The temperature was increased to 550°C at a rate of 20°C / h, held for 3 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 3

[0033] The chemical reaction is 2Sr(NO3)2 + 2SrCO3 + 4.5B2O3 = Sr3B9O 16 (NO3) + 3NO2↑ + CO2↑ + 0.75O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0034] Sr(NO3)2, SrCO3, and B2O3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was placed in a muffle furnace under high temperature and sealed with a flame. The temperature was increased to 600℃ at a rate of 30℃ / h, held for 5 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 4

[0035] The chemical reaction is 2Sr(NO3)2 + SrCO3 + 9H3BO3 = Sr3B9O 16(NO3) + 3NO2↑ + CO2↑ + 13.5H2O↑ + 0.75O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0036] Sr(NO3)2, SrCO3, and H3BO3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 Pa, under high temperature and flame-sealed, is placed in a muffle furnace and heated to 650 °C at a rate of 35 °C / h, held at that temperature for 6 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 5

[0037] The chemical reaction is: Sr(NO3)2 + 2SrCO3 + 4.5B2O3 = Sr3B9O 16 (NO3) + NO2↑ + 2CO2↑ + 0.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0038] Sr(NO3)2, SrCO3, and B2O3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was placed in a muffle furnace under high temperature and sealed with a flame. The temperature was increased to 700 °C at a rate of 25 °C / h, held for 7 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 6

[0039] The chemical reaction is Sr(NO3)2 + 2SrCO3 + 8H3BO3 = Sr3B9O 16 (NO3) + NO2↑ + 2CO2↑ + 13.5H2O↑ + 0.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0040] Sr(NO3)2, SrCO3, and H3BO3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was placed in a muffle furnace under high temperature and sealed with a flame. The temperature was increased to 750 °C at a rate of 10-50 °C / h, held for 8 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 7

[0041] The chemical reaction is 2Sr(NO3)2 + SrO + 4.5B2O3 = Sr3B9O 16 (NO3) + 3NO2↑ + 0.75O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0042] Sr(NO3)2, SrO, and B2O3 were mixed evenly according to the chemical formula ratio and then placed into a 10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1 × 10⁻⁶. −3 The compound Sr3B9O was obtained by sealing the sample in a flame at high temperature and placing it in a muffle furnace, heating it to 660 °C at a rate of 25 °C / h, holding it at that temperature for 10 days, and then slowly cooling it. 16 (NO3). Example 8

[0043] The chemical reaction is 2Sr(NO3)2 + SrO + 9H3BO3 = Sr3B9O 16 (NO3) + 3NO2↑ + 13.5H2O↑ + 0.75O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0044] Sr(NO3)2, SrO, and H3BO3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 Pa, under high temperature and flame-sealed, placed in a muffle furnace, heated to 590 °C at a rate of 48 °C / h, held at that temperature for 4 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 9

[0045] The chemical reaction is: Sr(NO3)2 + SrCO3 + SrO + 4.5B2O3 = Sr3B9O 16 (NO3) + NO2↑ + CO2↑ + 0.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0046] Sr(NO3)2, SrCO3, SrO, and B2O3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 Pa, under high temperature and flame-sealed, placed in a muffle furnace, heated to 730 °C at a rate of 39 °C / h, held at that temperature for 9 days, and then slowly cooled, yielded the compound Sr3B9O. 16 (NO3). Example 10

[0047] The chemical reaction is: Sr(NO3)2 + SrCO3 + SrO + 9H3BO3 = Sr3B9O 16 (NO3) + NO2↑ + CO2↑ + 13.5H2O↑ + 0.25O2↑ The compound Sr3B9O was synthesized using a vacuum-sealed tube method. 16 (NO3):

[0048] Sr(NO3)2, SrCO3, SrO, and H3BO3 were mixed evenly according to the chemical formula ratio and then placed into a Φ10 mm quartz tube. The quartz tube was then evacuated to a vacuum level of 1×10⁻⁶. −3 The mixture was placed in a muffle furnace under high temperature and sealed with a flame. The temperature was increased to 620 °C at a rate of 18 °C / h, held for 2 days, and then slowly cooled to obtain the compound Sr3B9O. 16 (NO3). Example 11

[0049] The chemical reaction is 3Sr(NO3)2 + 9H3BO3 = Sr3B9O 16 (NO3) + 5NO2↑ + 13.5H2O↑ + 1.25O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0050] a. Mix Sr(NO3)2 and H3BO3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0051] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 550℃ at a rate of 20℃ / h, held at that temperature for 2 days, and then cooled to room temperature at a rate of 0.5℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 12

[0052] The chemical reaction is 2Sr(NO3)2 + 2SrCO3 + 4.5B2O3 = Sr3B9O 16 (NO3) + 3NO2↑ + CO2↑ + 0.75O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0053] a. Mix Sr(NO3)2, SrCO3 and B2O3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0054] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 580℃ at a rate of 30℃ / h, held at that temperature for 3 days, and then cooled to room temperature at a rate of 0.7℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 13

[0055] The chemical reaction is 2Sr(NO3)2 + SrCO3 + 9H3BO3 = Sr3B9O 16 (NO3) + 3NO2↑ + CO2↑ + 13.5H2O↑ + 0.75O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0056] a. Mix Sr(NO3)2, SrCO3 and H3BO3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0057] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 600℃ at a rate of 15℃ / h, held for 4 days, and then cooled to room temperature at a rate of 0.9℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 14

[0058] The chemical reaction is: Sr(NO3)2 + 2SrCO3 + 4.5B2O3 = Sr3B9O 16 (NO3) + NO2↑ + 2CO2↑ + 0.25O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0059] a. Mix Sr(NO3)2, SrCO3 and B2O3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0060] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 750℃ at a rate of 14℃ / h, held at that temperature for 2 days, and then cooled to room temperature at a rate of 0.1℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 15

[0061] The chemical reaction is Sr(NO3)2 + 2SrCO3 + 8H3BO3 = Sr3B9O 16 (NO3) + NO2↑ + 2CO2↑ + 13.5H2O↑ + 0.25O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0062] a. Mix Sr(NO3)2, SrCO3 and H3BO3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0063] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, under high temperature and flame sealed, placed in a muffle furnace, heated to 620℃ at a rate of 32℃ / h, held at that temperature for 5 days, and then cooled to room temperature at a rate of 1℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 16

[0064] The chemical reaction is 2Sr(NO3)2 + SrO + 4.5B2O3 = Sr3B9O 16 (NO3) + 3NO2↑ + 0.75O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0065] a. Mix Sr(NO3)2, SrO and B2O3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0066] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 700℃ at a rate of 50℃ / h, held at that temperature for 8 days, and then cooled to room temperature at a rate of 1.5℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 17

[0067] The chemical reaction is 2Sr(NO3)2 + SrO + 9H3BO3 = Sr3B9O 16 (NO3) + 3NO2↑ + 13.5H2O↑ + 0.75O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0068] a. Mix Sr(NO3)2, SrO and H3BO3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0069] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 720℃ at a rate of 48℃ / h, held at that temperature for 6 days, and then cooled to room temperature at a rate of 1.8℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 18

[0070] The chemical reaction is: Sr(NO3)2 + SrCO3 + SrO + 4.5B2O3 = Sr3B9O 16 (NO3) + NO2↑ + CO2↑ + 0.25O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0071] a. Mix Sr(NO3)2, SrCO3, SrO and B2O3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0072] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3 Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 750°C at a rate of 50°C / h, held at that temperature for 7 days, and then cooled to room temperature at a rate of 2°C / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 19

[0073] The chemical reaction is: Sr(NO3)2 + SrCO3 + SrO + 9H3BO = Sr3B9O 16 (NO3) + NO2↑ + CO2↑ + 13.5H2O↑ + 0.25O2↑ Sr3B9O was prepared by a high-temperature melt method under vacuum sealing conditions. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0074] a. Mix Sr(NO3)2, SrCO3, SrO and H3BO3 evenly according to the chemical formula ratio, place them in a mortar and grind them thoroughly to make the reactants evenly mixed;

[0075] b. Load the mixture from step a into a Φ10 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1×10⁻⁶. −3Pa, sealed in a flame at high temperature, placed in a muffle furnace, heated to 650℃ at a rate of 50℃ / h, held at that temperature for 10 days, and then cooled to room temperature at a rate of 1.3℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. Example 20

[0076] The chemical reaction is 3Sr(NO3)2 + 4.5B2O3 = Sr3B9O 16 (NO3) + 5NO2↑ + 1.25O2↑ Sr3B9O was prepared by a hydrothermal method. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0077] a. Mix Sr(NO3)2 and B2O3 evenly according to the chemical formula ratio, transfer the mixture into the polytetrafluoroethylene liner of a 25 mL high-pressure reactor, add 1.5 ml of deionized water, and tighten and seal the reactor.

[0078] b. Place the high-pressure reactor from step a in an oven, raise the temperature to 180°C at a rate of 20°C / h, keep it at the temperature for 4 days, and then lower it to room temperature at a rate of 15°C / day. Open the high-pressure reactor and obtain the boric acid strontium nitrate nonlinear optical crystal from the clarified solution. Example 21

[0079] The chemical reaction is 3Sr(NO3)2 + 9H3BO3 = Sr3B9O 16 (NO3) + 5NO2↑ + 13.5H2O↑ + 1.25O2↑ Sr3B9O was prepared by a hydrothermal method. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0080] a. Mix Sr(NO3)2 and H3BO3 evenly according to the chemical formula ratio, transfer the mixture into the polytetrafluoroethylene liner of a 25 mL high-pressure reactor, add 1.5 ml of deionized water, and tighten and seal the reactor.

[0081] b. Place the high-pressure reactor from step a in an oven, raise the temperature to 210°C at a rate of 30°C / h, keep it at the temperature for 10 days, and then lower it to room temperature at a rate of 25°C / day. Open the high-pressure reactor and obtain the boric acid strontium nitrate nonlinear optical crystal from the clarified solution. Example 22

[0082] The chemical reaction is 2Sr(NO3)2 + SrO + 4.5B2O3 = Sr3B9O 16 (NO3) + 3NO2↑ + 0.75O2↑ Sr3B9O was prepared by a hydrothermal method. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0083] a. Mix Sr(NO3)2, SrO and B2O3 evenly according to the chemical formula ratio, transfer it into the polytetrafluoroethylene liner of a 100 mL high-pressure reactor, add 3 ml of deionized water and tighten the reactor to seal it.

[0084] b. Place the high-pressure reactor from step a in an oven and heat it to 190°C at a rate of 40°C / h. Maintain the temperature for 11 days, then cool it down to room temperature at a rate of 35°C / day. Open the high-pressure reactor and obtain the strontium borate nitrate nonlinear optical crystal from the clarified solution. Example 23

[0085] The chemical reaction is 2Sr(NO3)2 + SrO + 9H3BO3 = Sr3B9O 16 (NO3) + 3NO2↑ + 13.5H2O↑ + 0.75O2↑ Sr3B9O was prepared by a hydrothermal method. 16 (NO3) Nonlinear optical crystals, the specific operation shall be carried out according to the following steps:

[0086] a. Mix Sr(NO3)2, SrO and H3BO3 evenly according to the chemical formula ratio, transfer it into the polytetrafluoroethylene liner of a 100 mL high-pressure reactor, add 3 ml of deionized water and tighten the reactor to seal it.

[0087] b. Place the high-pressure reactor from step a in an oven, raise the temperature to 205°C at a rate of 50°C / h, maintain the temperature for 7 days, and then lower it to room temperature at a rate of 45°C / day. Open the high-pressure reactor and obtain the strontium borate nitrate nonlinear optical crystal from the clarified solution. Example 24

[0088] Take any one of the strontium borate nitrate nonlinear optical crystals obtained in Examples 11-23, and apply it according to the attached... Figure 4 As shown, when placed at position 3, at room temperature, using the 1064 nm output of a Q-switched Nd:YAG laser as the light source, a significant 1064 nm frequency-doubled green light output was observed, with an output intensity approximately three times that of KDP under the same conditions.

[0089] Figure 4 As shown, an infrared beam with a wavelength of 1064 nm emitted by a Q-switched Nd:YAG laser 1 is incident on a strontium borate-nitrogen nonlinear optical crystal through a focusing lens 2, producing green frequency-doubled light with a wavelength of 532 nm. The outgoing beam 4 contains infrared light with a wavelength of 1064 nm and green light with a wavelength of 532 nm. After being filtered by a filter 5, the frequency-doubled light with a wavelength of 532 nm is obtained.

Claims

1. A compound, strontium borate nitrate, characterized in that... The chemical formula of this compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was produced using a vacuum sealing method.

2. The method for preparing the compound strontium borate nitrate according to claim 1, characterized in that... It is manufactured using a vacuum sealing method, and the specific operation is carried out according to the following steps: Mix the Sr-containing, B-containing, and N-containing compounds thoroughly according to the molar ratio Sr:B:N = 2-4:8-11:0.5-2, and pack the mixture into a 10 mm × 100 mm quartz tube. Evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. −3 The compound Sr3B9O was obtained by sealing the sample in a flame at high temperature and placing it in a muffle furnace, heating it to 500-750 °C at a rate of 10-50 °C / h, holding it at that temperature for 1-10 days, and then slowly cooling it. 16 (NO3), of which Sr-containing compounds are Sr(NO3)2, SrCO3 or SrO, B-containing compounds are H3BO3 or B2O3, and N-containing compounds are Sr(NO3)2.

3. A strontium borate-nitrogen nonlinear optical crystal, characterized in that... The chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of [missing information]. Cc The unit cell parameters are a = 11.2574(9) Å, b = 6.6400(9) Å, c = 18.1027(13) Å, Z = 4, V = 1348.9(2) Å 3 .

4. The method for preparing the strontium borate-nitrogen nonlinear optical crystal according to claim 3, characterized in that... Crystals are prepared using a high-temperature melt method or a hydrothermal method under vacuum sealing conditions. Crystals were prepared using a high-temperature melt method under vacuum sealing conditions. The specific operation was carried out according to the following steps: a. Grind the Sr-containing compound, B-containing compound, and N-containing compound thoroughly in a mortar and mix them evenly according to the molar ratio Sr:B:N = 2-4:8-11:0.5-2; wherein the Sr-containing compound is Sr(NO3)2, SrCO3, or SrO, the B-containing compound is H3BO3 or B2O3, and the N-containing compound is Sr(NO3)2. b. Place the mixture from step a into a 10 mm × 100 mm quartz tube, and evacuate the quartz tube to a vacuum level of 1 × 10⁻⁶. −3 Pa, sealed under a high-temperature flame, placed in a muffle furnace, heated to 500-750℃ at a rate of 10-50℃ / h, held at the temperature for 1-10 days, and then cooled to room temperature at a rate of 0.1-2℃ / h. The quartz tube was then opened to obtain a strontium borate nitrate nonlinear optical crystal. The crystals were prepared using a hydrothermal method, and the specific procedures are as follows: a. Mix the Sr-containing compound, B-containing compound, and N-containing compound evenly in a molar ratio of Sr:B:N = 2-4:8-11:0.5-2, transfer the mixture to a PTFE-lined high-pressure reactor with a volume of 25-100 mL, add 1.5-3 mL of deionized water, and tighten and seal the reactor. The Sr-containing compound is Sr(NO3)2 or SrO, the B-containing compound is H3BO3 or B2O3, and the N-containing compound is Sr(NO3)2. b. Place the high-pressure reactor from step a in an oven and heat it to 170-220℃ at a rate of 20-60℃ / h. Maintain the temperature for 3-15 days, then cool it down to room temperature at a rate of 10-100℃ / day. Open the high-pressure reactor and obtain the strontium borate nitrate nonlinear optical crystal from the clarified solution.

5. The use of the strontium borate nitrate nonlinear optical crystal according to claim 3 in the preparation of frequency doubling generators and optical parametric oscillators.

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