CN117902586A - Rubidium strontium scandium borate compound, rubidium strontium scandium borate nonlinear optical crystal, preparation method and application thereof - Google Patents
Rubidium strontium scandium borate compound, rubidium strontium scandium borate nonlinear optical crystal, preparation method and application thereof Download PDFInfo
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- 239000013078 crystal Substances 0.000 title claims abstract description 134
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- -1 Rubidium strontium scandium borate compound Chemical class 0.000 title claims abstract description 32
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- 229910002651 NO3 Inorganic materials 0.000 claims description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 8
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Abstract
The invention discloses a rubidium strontium scandium borate compound, a rubidium strontium scandium borate nonlinear optical crystal, and a preparation method and application thereof. The chemical formula of the rubidium strontium scandium borate compound is Rb 7SrSc2B15O30. The rubidium strontium scandium borate nonlinear optical crystal is a single crystal, has proper nonlinear optical effect, is not deliquescent, and is suitable for the requirement of blue-green light wave band laser frequency conversion; the crystal can be used for manufacturing nonlinear optical devices. The preparation method of the nonlinear optical crystal has the advantages of high growth speed, low cost, easy obtainment of crystals with larger size and the like.
Description
Technical Field
The present invention relates to the field of growth of nonlinear optical crystals. More particularly, relates to a rubidium strontium scandium borate compound, a rubidium strontium scandium borate nonlinear optical crystal, and a preparation method and application thereof.
Background
Crystals with nonlinear optical effects are referred to as nonlinear optical crystals. The nonlinear optical crystal effect refers to effects such as frequency multiplication, sum frequency, difference frequency, parametric amplification and the like. Only crystals without a centre of symmetry may have nonlinear optical effects. The nonlinear optical effect of the crystal can be used for manufacturing nonlinear optical devices such as a second harmonic generator, an upper frequency converter, a lower frequency converter, an optical parametric oscillator and the like. The laser generated by the laser can be subjected to frequency conversion through a nonlinear optical device, so that laser with more useful wavelengths is obtained, and the laser is widely applied. The all-solid-state blue-green laser system can be realized by generating near infrared laser by a solid laser and performing frequency conversion by a nonlinear optical crystal, and has a huge application prospect in the technical field of laser.
The nonlinear optical materials currently applied to blue-green band laser frequency conversion mainly comprise KTP (KTiOPO 4)、BBO(β-Ba2B2O4) and LBO (LiB 3O5) crystals. These materials have grown-in disadvantages: since KTP and LBO are non-homogeneous molten compounds, and BBO has phase change at the melting point, the KTP and the LBO are grown by a flux method, the growth speed is low, large-size crystals are not easy to obtain, the cost is high, and the large-scale application of an all-solid-state laser is influenced. Rare earth nonlinear optical crystals are a relatively unique class of crystalline materials. Since rare earth ions have great relativity in coordination structure, their physical and chemical properties are such that the rare earth ions do not cause mutation of crystal structure when substituted (partially or wholly), thus modification of materials is easily achieved, and it has been found that such rare earth materials have YAl3(BO3)3、NdxY1-xAl3(BO3)4、CaMO(BO3)3(M＝La、Gd、Sm、Er、Y、Lu)、R2MB10O19(R representing one or at least two elements selected from rare earth elements or Y; m is selected from Ca, sr, ba) and Na 3La9O3(BO3)8, etc., which can be used for manufacturing nonlinear optical devices of blue-green light wave bands. But how to find more nonlinear optical materials with fast growth speed and large-sized green-band laser frequency conversion has been one of the directions of research by those skilled in the art.
Disclosure of Invention
Based on the facts, the invention aims to provide a nonlinear optical material capable of rapidly growing to obtain large-size green band laser frequency conversion.
In one aspect, the invention provides a rubidium strontium scandium borate compound with a chemical formula of Rb 7SrSc2B15O30.
In still another aspect, the present invention provides a method for preparing a rubidium strontium scandium borate compound, which synthesizes the rubidium strontium scandium borate compound by a high temperature solid phase method, the method comprising the following steps:
Uniformly mixing an Rb-containing compound, an Sr-containing compound, an Sc-containing compound and a B-containing compound according to the mol ratio of Rb to Sr to Sc to B=7 to 1 to 2 to 15, heating to 650-700 ℃ at a heating rate of 20-30 ℃/h, preserving heat for 48-96 hours, cooling to room temperature at a rate of 30-50 ℃/h, and grinding to obtain the Rb 7SrSc2B15O30 compound.
The inventor finds that the final target product rubidium strontium scandium borate compound cannot be obtained by using two common synthesis methods, namely a hydrothermal method and a solvothermal method, and the target product can be well synthesized by using a high-temperature solid-phase rule.
Further, the compound containing Rb is selected from one or more of Rb oxide, rb nitrate, rb carbonate or Rb oxalate.
Further, the Sr-containing compound is selected from one or more of an oxide of Sr, a hydroxide of Sr, a nitrate of Sr, a carbonate of Sr or an oxalate of Sr.
Further, the Sc-containing compound is selected from the group consisting of an oxide of Sc or a halide of Sc.
Further, the B-containing compound is selected from H 3BO3 or B 2O3.
In yet another aspect, the present invention provides a rubidium strontium scandium borate nonlinear optical crystal having the chemical formula Rb 7SrSc2B15O30; the crystal does not have a symmetrical center, belongs to a trigonal system, has a space group of R32, and has the following unit cell parameters:α＝β＝90°，γ＝120°，Z＝3。
In still another aspect, the invention provides a method for preparing a rubidium strontium scandium borate nonlinear optical crystal, which adopts a fluxing agent method to grow the crystal, and specifically comprises the following steps:
1) Mixing the rubidium strontium scandium borate compound and a fluxing agent NH 4BF4 according to a molar ratio of 1:7-10; or (b)
Mixing Rb-containing compound, sr-containing compound, sc-containing compound, B-containing compound and fluxing agent NH 4BF4 according to mol ratio Rb: sr: sc: B: NH 4BF4 =7:1:2:15:7-10;
2) Placing the crucible containing the materials obtained in the step 1) into a crystal furnace, and heating to enable the sample to be fully melted and uniformly mixed to obtain a high-temperature solution;
3) Searching the saturation temperature of crystal growth by using a seed crystal test method, introducing the fixed seed crystal into the surface of the high-temperature molten liquid or the high-temperature molten liquid at the temperature of 5-25 ℃ above the saturation temperature, keeping the temperature for 10-200 minutes, and reducing the temperature to the saturation temperature;
4) Taking the saturation temperature as the initial temperature of cooling, cooling at the speed of 1-5 ℃/day, and simultaneously rotating the crystal and/or the crucible at the speed of 10-100rpm to perform crystal growth; and after the crystal grows to the required size, lifting the crystal from the liquid level, and cooling to room temperature at the speed of 30-50 ℃/h to obtain the rubidium strontium scandium borate nonlinear optical crystal.
In the preparation method of the invention, the fusing point of the fluxing agent NH 4BF4 is lower, and the fluxing agent NH 4BF4 is easy to decompose at high temperature, so that other elements are not easy to leave in the system, and the fluxing effect is good. Meanwhile, rb 7SrSc2B15O30 monocrystal with the size of centimeter grade is obtained; by using a large-sized crucible, a single crystal of a correspondingly large size can be obtained.
Further, in step 2), the heating conditions are: heating to 600-650 ℃ at a speed of 20-30 ℃/h and preserving heat for 24-48 hours, and heating to 750-800 ℃ at a speed of 60-100 ℃/h and preserving heat for 24-96 hours.
Further, in step 1), the Rb-containing compound is selected from one or more of Rb oxide, rb nitrate, rb carbonate, or Rb oxalate.
Further, the Sr-containing compound is selected from one or more of an oxide of Sr, a hydroxide of Sr, a nitrate of Sr, a carbonate of Sr or an oxalate of Sr.
Further, the Sc-containing compound is selected from the group consisting of an oxide of Sc or a halide of Sc.
Further, the B-containing compound is selected from H 3BO3 or B 2O3.
Further, the crucible is made of platinum.
In yet another aspect, the invention provides the use of a rubidium strontium scandium borate nonlinear optical crystal as described above in the preparation of a nonlinear optical device.
According to crystallographic data of the crystal, the crystal blank is oriented, the crystal is cut according to the required angle, thickness and section size, and the light-passing surface of the crystal is polished, so that the crystal can be used as a nonlinear optical device. The optical processing methods of the nonlinear optical crystal described above are familiar to those skilled in the art. The crystal provided by the invention has no special requirement on optical processing precision.
Further, the application includes: means for producing at least one beam of output radiation having a frequency different from the incident electromagnetic radiation after passing the at least one beam of incident electromagnetic radiation through the at least one nonlinear optical crystal of rubidium strontium scandium borate.
Further, the device includes, but is not limited to, a frequency multiplier, an up-frequency converter, a down-frequency converter, an optical parametric oscillator, an optical parametric amplifier, or the like.
The self-frequency doubling mechanism device made of the laser nonlinear optical crystal is placed in an optical resonant cavity formed by a total reflection mirror and an output mirror, and is excited by an optical pumping source, so that the crystal generates infrared laser output, and green frequency doubling laser output can be obtained.
The beneficial effects of the invention are as follows:
the rubidium strontium scandium borate nonlinear optical crystal is a single crystal, has proper nonlinear optical effect, is not deliquescent, and is suitable for the requirement of blue-green light wave band laser frequency conversion; the crystal can be used for manufacturing nonlinear optical devices. The preparation method of the nonlinear optical crystal has the advantages of high growth speed, low cost, easy obtainment of crystals with larger size and the like.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Fig. 1 shows XRD patterns of Rb 7SrSc2B15O30 single crystals prepared in examples.
Fig. 2 shows a schematic structural diagram of Rb 7SrSc2B15O30 single crystal prepared in the example.
Fig. 3 shows an infrared spectrum of Rb 7SrSc2B15O30 single crystal prepared in the example.
Fig. 4 shows a schematic diagram of the operation of a typical nonlinear optical device made of Rb 7SrSc2B15O30 single crystals prepared in the examples.
Fig. 5 shows an application effect diagram of a nonlinear optical device made of Rb 7SrSc2B15O30 single crystal prepared in the example.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Example 1
The Rb 7SrSc2B15O30 compound was prepared as a powder.
The solid phase reaction method is adopted, and the reaction equation is as follows:
7Rb2CO3+2SrCO3+2Sc2O3+15B2O3＝2Rb7SrSc2B15O30+9CO2↑
The three reagent feeding amounts are as follows: rb 2CO3: 309.606 g (1.341 mol); srCO 3: 56.546 g (0.383 mol); sc 2O3: 52.824 g (0.383 mol); b 2O3: 200 g (2.873 mol).
The specific operation steps are as follows: weighing the above reagents respectively, placing them into mortar, mixing, grinding, and loading into a containerCompacting the powder in an open platinum crucible, placing the powder in a muffle furnace, heating to 700 ℃ at a speed of 20 ℃/h, keeping the temperature for 48 hours, cooling to room temperature at a speed of 30 ℃/h, and grinding to obtain a powder sample Rb 7SrSc2B15O30.
Example 2
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
162.936 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 120.474 g of NH 4BF4, i.e. in a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:10, were charged The pretreated crucible is placed into a vertical single crystal growth furnace, an opening at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and go out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 600 ℃ at the speed of 20 ℃/h, the temperature is kept for 24 hours, the temperature is raised to 750 ℃ at the speed of 60 ℃/h, the temperature is kept for 24 hours, the high-temperature melt is fully homogenized, and the saturation temperature for the growth of crystals is found by a seed crystal test method to be 723.5 ℃. Cooling the high-temperature melt to 728.5 ℃ (5 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 725 ℃ at a speed of 5 ℃/day, cooling at a speed of 1 ℃/day, after 10 days, lifting the crystals from the melt liquid surface, annealing at a speed of 30 ℃/h, cooling to room temperature, and obtaining Rb 7SrSc2B15O30 single crystals with the size of 11 multiplied by 8 multiplied by 9 mm.
Example 3
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
149.358 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 99.391 g of NH 4BF4, i.e. with a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:9, were charged The pretreated crucible is placed into a vertical single crystal growth furnace, an opening at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and go out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 630 ℃ at the speed of 25 ℃/h, the temperature is kept for 36 hours, the temperature is raised to 780 ℃ at the speed of 80 ℃/h, the temperature is kept for 36 hours, the high-temperature melt is fully homogenized, and the saturation temperature for the growth of crystals is found by a seed crystal test method to be 723.5 ℃. Cooling the high-temperature melt to 738.5 ℃ (15 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 726 ℃ at the speed of 4 ℃/day, cooling to the speed of 1.5 ℃/day, cooling to the end of crystal growth after 15 days, lifting the crystal from the melt liquid surface, annealing at the speed of 40 ℃/h, cooling to room temperature, and obtaining Rb 7SrSc2B15O30 single crystals with the size of 7X 5X 7 mm.
Example 4
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
176.514 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 104.411 g of NH 4BF4, i.e. with a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:8, were charged The pretreated crucible is placed into a vertical single crystal growth furnace, an opening positioned at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and go out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 650 ℃ at the speed of 30 ℃/h, the temperature is kept for 48 hours, the temperature is raised to 800 ℃ at the speed of 100 ℃/h, the temperature is kept for 48 hours, the high-temperature melt is fully homogenized, and the saturation temperature for the growth of the crystal is found by a seed crystal test method to be 723.5 ℃. Cooling the high-temperature melt to 743.5 ℃ (20 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 725 ℃ at a speed of 3 ℃/day, cooling at a speed of 2 ℃/day, after 15 days, lifting the crystals from the melt liquid surface, and annealing at a speed of 50 ℃/h to room temperature to obtain Rb 7SrSc2B15O30 single crystals with a size of 8 multiplied by 7 multiplied by 6 mm.
Comparative example 1
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
162.936 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 120.474 g of NH 4BF4, i.e. in a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:10, were charged In the open platinum crucible, the pretreated crucible is put into a vertical single crystal growth furnace, an opening at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 600 ℃ at a speed of 35 ℃/h, BF 3 and NH 3 in the initial raw material are rapidly discharged due to the excessively high temperature raising speed, so that the mixture is obviously sprayed, the temperature is kept for 24 hours, the mixture is heated to 750 ℃ at a speed of 60 ℃/h and kept for 24 hours, the high temperature melt is fully homogenized, and the saturated temperature for finding the crystal growth is 723.5 ℃ by a seed crystal test method. Cooling the high-temperature melt to 728.5 ℃ (5 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 725 ℃ at a rate of 5 ℃/day, cooling at a rate of 1 ℃/day, and observing that no crystal grows outside the seed crystals after 10 days.
Comparative example 2
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
149.358 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 99.391 g of NH 4BF4, i.e. with a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:9, were charged The pretreated crucible is placed into a vertical single crystal growth furnace, an opening at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and go out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 630 ℃ at the speed of 25 ℃/h, the temperature is kept for 36 hours, the temperature is raised to 780 ℃ at the speed of 80 ℃/h, the temperature is kept for 36 hours, the high-temperature melt is fully homogenized, and the saturation temperature for the growth of crystals is found by a seed crystal test method to be 723.5 ℃. Cooling the high-temperature melt to 738.5 ℃ (15 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 726 ℃ at the speed of 4 ℃/day, cooling to the speed of 6 ℃/day, after 15 days, lifting the crystals from the melt liquid surface, and annealing at the speed of 40 ℃/h to room temperature. It is observed that the cooling rate in the crystal growth stage is too fast, so that the grown crystal has obvious cracking and peritectic phenomena, and the Rb 7SrSc2B15O30 large crystal with good quality can not be obtained.
Comparative example 3
Preparing Rb 7SrSc2B15O30 crystal by adopting a fluxing agent method, and taking NH 4BF4 as a fluxing agent;
149.358 g of the compound Rb 7SrSc2B15O30 obtained in example 1 and 99.391 g of NH 4BF4, i.e. with a molar ratio Rb 7SrSc2B15O30:NH4BF4 of 1:9, were charged The pretreated crucible is placed into a vertical single crystal growth furnace, an opening at the top of the furnace is sealed by a heat insulation material, a small hole for a seed rod to go in and go out is reserved at the position corresponding to the center position of the crucible at the top of the furnace, the temperature is raised to 630 ℃ at the speed of 25 ℃/h, the temperature is kept for 36 hours, the temperature is raised to 780 ℃ at the speed of 80 ℃/h, the temperature is kept for 36 hours, the high-temperature melt is fully homogenized, and the saturation temperature for the growth of crystals is found by a seed crystal test method to be 723.5 ℃. Cooling the high-temperature melt to 738.5 ℃ (15 ℃ above saturation temperature), fixing Rb 7SrSc2B15O30 seed crystals cut along the c-axis at the lower end of a seed rod by using a platinum wire, introducing the seed crystals into a crucible from a small hole at the top of the furnace to be in contact with the melt liquid surface, keeping the temperature for 20 minutes at 30rpm, cooling to 726 ℃ at the speed of 4 ℃/day, cooling to the speed of 0.5 ℃/day, after 15 days, lifting the seed crystals from the melt liquid surface, and annealing at the speed of 40 ℃/h to room temperature. It was observed that the melt mixture had significant volatilization due to the too slow cooling rate during the crystal growth phase, and no crystal grew on the outside of the seed crystal.
The obtained nonlinear optical crystal Rb 7SrSc2B15O30 was characterized by XRD, and as shown in FIG. 1, the nonlinear optical crystal Rb 7SrSc2B15O30 prepared in examples 2-4 belongs to a trigonal system, the space group is R32, and the unit cell parameters are as follows:α＝β＝90°，γ＝120°，Z＝3。
Fig. 2 is a schematic structural diagram of the Rb 7SrSc2B15O30 nonlinear optical crystal.
FIG. 3 is a characterization of the IR spectrum with asymmetric stretching peaks at 1373, 1257 and 1188cm -1,BO4 for BO 3, symmetric stretching peaks at 1041cm -1,BO3, symmetric stretching peaks at 925cm -1,BO4 and bending peaks at 786 and 732cm -1,BO3 and BO 4 located near 613cm -1. The infrared spectrum shows that the coordination modes of B in Rb 7SrSc2B15O30 are BO 3 and BO 4, and the existence of B 5O10 groups in the structure is consistent with the actual structure.
Fig. 4 is a schematic diagram of the operation of a typical nonlinear optical device made of Rb 7SrSc2B15O30 crystals of the present invention, where 1 is a laser, 2 is an incident laser beam, 3 is a crystal post-processed and optically processed Rb 7SrSc2B15O30 single crystal, 4 is an outgoing laser beam produced, and 5 is a filter.
The nonlinear optical device fabricated by using Rb 7SrSc2B15O30 crystal according to the present invention is described in detail below with reference to FIG. 4. The laser 1 emits a light beam 2 into the Rb 7SrSc2B15O30 monocrystal 3, and the emitted light beam 4 passes through the filter 5, so that a required laser beam is obtained. The nonlinear optical device can enable a frequency multiplication generator, an upper frequency converter, a lower frequency converter, an optical parametric oscillator and the like. The laser 1 can use a neodymium-doped yttrium aluminum garnet (Nd: YAG) laser or other lasers, for a frequency doubling device using the Nd: YAG laser as a light source, an incident light beam 2 is infrared light with the wavelength of 1064nm, green frequency doubling light with the wavelength of 532nm is generated through Rb 7SrSc2B15O30 single crystals, an emergent light beam 4 contains infrared light with the wavelength of 1064nm and green light with the wavelength of 532nm, and a filter 5 is used for filtering infrared light components and only allowing green frequency doubling light to pass through.
Rb 7SrSc2B15O30 crystal is not easy to crack, is easy to cut, is polished, processed and stored, is not deliquescent, and is made into a frequency doubling device with the cross section size of 6x5mm and the light transmission thickness of 6mm, and the device is arranged at the position of 3 according to the figure 4, and the Q Nd is adjusted at room temperature: the YAG laser is used as a light source, the incident wavelength is 1064nm infrared light, the output wavelength is 532nm green laser, the laser signal intensity is 490.2mJ and is about 0.8 times of KDP, and as shown in figure 5, the application effect in outputting 532nm green laser is similar to KDP.
Devices fabricated using the Rb 7SrSc2B15O30 nonlinear optical crystal of the present invention may be frequency doubling generators, upper and lower frequency converters, optical parametric oscillators, optical parametric amplifiers, etc.
The method can be realized by the upper and lower limit values of the interval and the interval value of the process parameters (such as temperature, time and the like), and the examples are not necessarily listed here.
The invention may be practiced without these specific details, using any knowledge known in the art.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (9)
1. A rubidium strontium scandium borate compound is characterized in that the chemical formula of the compound is Rb 7SrSc2B15O30.
2. The method for preparing a rubidium strontium scandium borate compound according to claim 1, wherein said rubidium strontium scandium borate compound is synthesized by a high temperature solid phase method, said method comprising the steps of:
Uniformly mixing an Rb-containing compound, an Sr-containing compound, an Sc-containing compound and a B-containing compound according to the mol ratio of Rb to Sr to Sc to B=7 to 1 to 2 to 15, heating to 650-700 ℃ at a heating rate of 20-30 ℃/h, preserving heat for 48-96 hours, cooling to room temperature at a rate of 30-50 ℃/h, and grinding to obtain the Rb 7SrSc2B15O30 compound.
3. The preparation method according to claim 2, wherein the Rb-containing compound is selected from one or more of Rb oxide, rb nitrate, rb carbonate, or Rb oxalate;
the Sr-containing compound is selected from one or more of oxide of Sr, hydroxide of Sr, nitrate of Sr, carbonate of Sr or oxalate of Sr;
the Sc-containing compound is selected from the group consisting of oxides of Sc or halides of Sc;
The B-containing compound is selected from H 3BO3 or B 2O3.
4. A rubidium strontium scandium borate nonlinear optical crystal is characterized in that the chemical formula of the crystal is Rb 7SrSc2B15O30; the crystal does not have a symmetrical center, belongs to a trigonal system, has a space group of R32, and has the following unit cell parameters: α＝β＝90°，γ＝120°，Z＝3。
5. the method for preparing a nonlinear optical crystal of rubidium strontium scandium borate according to claim 4, wherein the crystal is grown by a flux method, specifically comprising the steps of:
1) Mixing the rubidium strontium scandium borate compound and a fluxing agent NH 4BF4 according to a molar ratio of 1:7-10; or (b)
Mixing Rb-containing compound, sr-containing compound, sc-containing compound, B-containing compound and fluxing agent NH 4BF4 according to mol ratio Rb: sr: sc: B: NH 4BF4 =7:1:2:15:7-10;
2) Placing the crucible containing the materials obtained in the step 1) into a crystal furnace, and heating to enable the sample to be fully melted and uniformly mixed to obtain a high-temperature solution;
3) Searching the saturation temperature of crystal growth by using a seed crystal test method, introducing the fixed seed crystal into the surface of the high-temperature molten liquid or the high-temperature molten liquid at the temperature of 5-25 ℃ above the saturation temperature, keeping the temperature for 10-200 minutes, and reducing the temperature to the saturation temperature;
4) Taking the saturation temperature as the initial temperature of cooling, cooling at the speed of 1-5 ℃/day, and simultaneously rotating the crystal and/or the crucible at the speed of 10-100rpm to perform crystal growth; and after the crystal grows to the required size, lifting the crystal from the liquid level, and cooling to room temperature at the speed of 30-50 ℃/h to obtain the rubidium strontium scandium borate nonlinear optical crystal.
6. The method according to claim 5, wherein in step 2), the heating conditions are: heating to 600-650 ℃ at a speed of 20-30 ℃/h and preserving heat for 24-48 hours, and heating to 750-800 ℃ at a speed of 60-100 ℃/h and preserving heat for 24-96 hours.
7. The preparation method according to claim 5, wherein in step 1), the Rb-containing compound is selected from one or more of Rb oxide, rb nitrate, rb carbonate, or Rb oxalate;
the Sr-containing compound is selected from one or more of oxide of Sr, hydroxide of Sr, nitrate of Sr, carbonate of Sr or oxalate of Sr;
the Sc-containing compound is selected from the group consisting of oxides of Sc or halides of Sc;
The B-containing compound is selected from H 3BO3 or B 2O3.
8. The use of a rubidium strontium scandium borate nonlinear optical crystal according to claim 4 for the preparation of a nonlinear optical device.
9. The application according to claim 8, characterized in that it comprises: means for producing at least one beam of output radiation having a frequency different from the incident electromagnetic radiation after passing the at least one beam of incident electromagnetic radiation through the at least one nonlinear optical crystal of rubidium strontium scandium borate.
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