CN103849932B - A kind of barium fluoborate sodium ultraviolet double-refraction crystal and growing method and purposes - Google Patents
A kind of barium fluoborate sodium ultraviolet double-refraction crystal and growing method and purposes Download PDFInfo
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Abstract
The barium fluoborate sodium ultraviolet double-refraction crystal that the present invention relates to and growing method and purposes；Its chemical formula is Ba2Na3(B3O6)2F, belongs to uniaxial negative crystal, its refractive index no>ne, ultraviolet cut-on limit is about 185nm；This hardness of crystals is moderate, it is easy to processing, and stable in the air；This barium fluoborate sodium birefringece crystal can use flux growth metrhod or melt Czochralski grown；There is bigger birefringence Δ n=no-ne, in 2000nm～185nm wave-length coverage, its birefringence Δ n is between 0.087～0.192；There is important application prospect at optics and optical communication field, can be used for making polarization beam splitter prism；Described polarization beam splitter prism is Glan type prism, Wollaston prism, Rochon prism or light beam separation polarizer.
Description
Technical field
The present invention relates to can be used for the borofluoride birefringece crystal of ultraviolet deep ultraviolet, particularly a kind of deep for ultraviolet
The molecular formula of ultraviolet is Ba2Na3(B3O6)2The barium fluoborate sodium of F (is called for short: BNBF) birefringece crystal and growth side thereof
Method and purposes.
Background technology
Birefringence refers to that light beam projects the phenomenons of generation two bundle refraction light on plane of crystal, produces this phenomenon
Basic reason is the anisotropy of crystalline material.The birefringence of crystal is the important of electric light functional crystal material
Optical performance parameter.Birefringent crystal material is of many uses, is mainly used in optics and optical communication field.
MgF is mainly had currently used as birefringent crystal material2Crystal, TiO2Crystal, LiNbO3Crystal, calcite (CaCO3)
Crystal and YVO4 crystal etc..MgF2Crystal is 110～8500nm through spectral region, and it is that one is well suited for answering
It is used in the material of deep ultraviolet wave band, but its too small birefringence limits its application；TiO2Although crystal is two-fold
Rate of penetrating is big, but it can only achieve about 400nm through wave band, in addition its shortcoming growth difficulty；Calcite is brilliant
Body birefringence is big, is the most frequently used birefringece crystal, but it is mainly to be naturally occurring, and impurity content is high,
And its use wave band is also unable to reach dark purple outskirt (< 250nm)；YVO4It is that a kind of excellent synthetic birefringence is brilliant
Body, has bigger birefringence, excellent physicochemical stability and mechanical performance, and easily grows, but its
It is 400～5000nm through scope, it is impossible to for ultra-violet (UV) band；LiNbO3Although being also that the most ripe a kind of birefringence is brilliant
Body, but its birefringence is relatively small, only about YVO under 1.5 mum wavelengths41/3rd, and it is also
Cannot be used for ultraviolet region.
More than summary, the birefringece crystal being applied to ultraviolet deep ultraviolet wave band lacks very much, is therefore highly desirable to visit
Seek a kind of easy growth, good physical and chemical, ultraviolet cut-on limit short and there is the crystal of bigger birefringence.
In recent decades, some borate crystals are short due to its ultraviolet cut-on limit, and nonlinear optical coefficients are big and swash
Light injury threshold advantages of higher and receive significant attention, the BaB of such as low-temperature phase2O4(BBO) crystal and LiB3O5(LBO)
Crystal etc..Except, in addition to the application in terms of nonlinear optics, borate crystal is at birefringent material, particularly purple
Outward, deep ultraviolet section, it may have great application potential.There is several boron that can serve as birefringent material in recent years
Hydrochlorate crystal is seen in report, such as α-BBO(high-temperature-phase BaB2O4) crystal, Ca3(BO3)2Crystal, REBa3B9O18(RE=
Rare earth element) crystal etc., but these crystal all some defects.High-temperature-phase bbo crystal through scope be 189～
3500nm, birefringence is relatively big, but the easy deliquescence of this crystal, and there are solid-state phase changes, easily in growth course
Cracking, have impact on yield rate and the utilization rate of crystal；Ca3(BO3)2The ultraviolet cut-on limit of crystal has reached 180nm, but
It is the highest in ultra-violet (UV) band transmitance, and birefringence is less than normal, limit its application；YBa3B9O18Serial crystal due to
Containing rare earth element, exist in ultra-violet (UV) band and absorb, through scope at 300-3000nm, be not suitable for deep ultraviolet region.
Barium fluoborate sodium birefringece crystal since being in the news for 2009, owing to this crystal is a kind of structure intentionally,
Cannot act as nonlinear optical material, so few people continue to pay close attention to studies it.Report claims: this compound
Chemical formula is Ba2Na3(B3O6)2F, belongs to hexagonal crystal system, and space group is P63/ m, cell parameter Z=2.Building stone basic in this crystal structure is B3O6Group, these B3O6Group is complete
Formation layer structure arranged in parallel, B in every layer3O6Group points to too, but the B of adjacent two layers3O6Group becomes reversely
Arrangement, thus counteract their nonlinear effect.This structure will produce the biggest anisotropy, is a kind of producing
The typical structure of raw bigger birefringence.For this birefringence purposes and growing method thereof, someone uses BaB before this2O4
Growing with certain proportion mixing with NaF two-phase, somebody is directly at Ba2Na3(B3O6)2One is added on the basis of F
The BaF of certainty ratio2Grow as flux；Both approaches all can grow the monocrystalline of Centimeter Level, but brilliant
Weight is bad, and transparent region is little.
Summary of the invention
It is an object of the invention to provide a kind of barium fluoborate sodium birefringece crystal, molecular formula is Ba2Na3(B3O6)2F；
Another object of the present invention is to provide the growing method of described barium fluoborate sodium birefringece crystal；
It is still another object of the present invention to provide the purposes of described barium fluoborate sodium birefringece crystal.
To achieve these goals, technical scheme is as follows:
The barium fluoborate sodium birefringece crystal for ultraviolet deep ultraviolet that the present invention provides, its chemical formula is
Ba2Na3(B3O6)2F, this barium fluoborate sodium birefringece crystal is uniaxial negative crystal, its refractive index no>ne, ultraviolet cut-on
While be 185nm；In 2000nm～185nm wave-length coverage, its birefringence is between 0.087～0.192.
The growing method of the barium fluoborate sodium crystal that the present invention provides, it uses flux growth metrhod and melt Czochralski grown
Crystal.
The step of described flux growth metrhod growth crystal is as follows:
By containing barium compound, compounds containing sodium, boron-containing compound and fluorochemical flux by barium therein:
Sodium: boron: mol ratio=2.1 of fluorine～2.65:3.1～5:6:1.3～the ratio mixed grinding of 4.3, loads crystal
In platinum crucible in growth furnace, it is heated to molten condition and obtains blend melt, stir 24～48 hours, by tasting
Examination seed-grain method determines the saturation point temperature of above-mentioned blend melt；When temperature is risen to more than saturation point temperature 2～10 DEG C,
The seed rod being fixed with seed crystal is put in crystal growing furnace so that it is touch blend melt surface or be deep into molten
Internal；It is incubated 0～60 minute after placing seed rod, cools the temperature to saturation point temperature subsequently, simultaneously with 5～30
Rev/min speed of rotation rotary seed crystal rod, under conditions of rate of temperature fall is 0.05～5 DEG C/day grow crystal；Treat
Crystal growth, to after centimeter-scale, by crystal lift-off liquid level, and is down to room with the rate of temperature fall of 2～30 DEG C/h
Temperature, obtains barium fluoborate sodium birefringece crystal；Described fluorochemical flux is the fluorine that purity is not less than 99.7%
Change sodium and barium fluoride mixture.
The step of described crystal grown by Czochralski method from melt is as follows:
By containing barium compound, compounds containing sodium, boron-containing compound and fluorochemical by barium therein: sodium: boron:
The ratio mixed grinding of mol ratio=2.1 of fluorine～2.65:3.1～5:6:1.3～4.3, loads in crystal growing furnace
Platinum crucible in, be heated to molten condition and obtain blend melt, stir 24～48 hours, by attempt seed-grain method
Determine the saturation point temperature of above-mentioned blend melt；When temperature is risen to more than saturation point temperature 2～10 DEG C, will be fixed with
The seed rod of seed crystal is slowly put in crystal growing furnace so that it is touches blend melt surface or is deep in melt；
It is incubated 0～60 minute after placing seed rod, cools the temperature to saturation point temperature subsequently, simultaneously with 5～30 revs/min
The speed of rotation rotary seed crystal rod of clock, rate of temperature fall be 0.05～5 DEG C/day cooling and 0.1～10mm/ hour lifting speed
Crystal is grown under conditions of rate lifting seed rod；After crystal growth to centimeter-scale, by crystal lift-off liquid level,
And it is down to room temperature with the rate of temperature fall of 2～30 DEG C/h, obtain barium fluoborate sodium birefringece crystal；Described is fluorine-containing
Compound flux is sodium fluoride and the barium fluoride mixture that purity is not less than 99.7%.
Described containing barium compound be purity be not less than 99.7% barium halide, brium carbonate, barium nitrate, barium acetate or
Barium oxalate；Described compounds containing sodium purity be not less than 99.7% sodium halide, sodium carbonate, sodium nitrate, sodium sulphate,
Sodium acetate or sodium oxalate；Described boron-containing compound is boric acid or the boron oxide that purity is not less than 99.7%.
The purposes of the borofluoride birefringece crystal for ultraviolet deep ultraviolet that the present invention provides, it is characterised in that institute
The barium fluoborate sodium birefringece crystal stated is for making polarization beam splitter prism.Described polarization beam splitter prism is Glan type
Prism, Wollaston prism, Rochon prism or light beam separation polarizer.
Advantages of the present invention is as follows: the Ba that the present invention provides2Na3(B3O6)2F birefringece crystal through wide ranges
(185～3000nm), birefringence is big, and in 2000nm～185nm wave-length coverage, its birefringence Δ n exists
Between 0.087～0.192, can be used for deep ultraviolet wave band (185～350nm), and be prone to processing, stable in the air.
Can be used widely in terms of making polarization beam splitter prism；In its preparation method, use BaF2Mix with NaF
This crystal is grown by the method for flux, and mixed flux is advantageous in that the viscosity that can substantially reduce system,
And then it is many to improve inclusion enclave, the problem that transparent region is little.
Accompanying drawing explanation
Fig. 1 is the prism picture that the barium fluoborate sodium birefringece crystal for ultraviolet deep ultraviolet that the present invention grows cuts out；
Fig. 2 be the barium fluoborate sodium birefringece crystal for ultraviolet deep ultraviolet that the present invention grows crystal refractive index n with
The relation matched curve figure of wavelength X；
Fig. 3 is the Glan type made of the barium fluoborate sodium birefringece crystal for ultraviolet deep ultraviolet of present invention growth
Prism schematic diagram；
Fig. 4 be with the present invention growth for ultraviolet deep ultraviolet barium fluoborate sodium birefringece crystal make Walla this
Pause prism schematic diagram；
Fig. 5 is the Lip river breast rib made of the barium fluoborate sodium birefringece crystal for ultraviolet deep ultraviolet of present invention growth
Mirror is intended to.
Detailed description of the invention
Embodiment 1: flux growth metrhod growth Ba2Na3(B3O6)2F birefringece crystal:
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.1:3.1:6:1.3,
It is equal to BNBF, BaF2It is 1:0.1:0.1 with the mol ratio of NaF；
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into crystal growth
In platinum crucible in stove, it is heated to molten condition and obtains blend melt, stir 48 hours, by attempting seed-grain method
Determine the saturation point temperature of this blend melt；When temperature is risen to more than saturation point temperature 3 DEG C, seed crystal will be fixed with
Seed rod is slowly put in crystal growing furnace, makes the seed crystal of seed rod lower end touch blend melt surface or go deep into
In melt；Place and be incubated 10 minutes after seed crystal, then cool the temperature to saturation point temperature, simultaneously with 25 turns/
Minute speed of rotation rotary seed crystal rod, with the rate of temperature fall of 0.2 DEG C/day start cooling；Treat crystal growth to centimetre
After level size, by crystal lift-off liquid level, and it is down to room temperature with the rate of temperature fall of 20 DEG C/h, obtains a size of
The barium fluoborate sodium birefringece crystal of 18 × 20 × 12mm.
Embodiment 2: flux growth metrhod growth Ba2Na3(B3O6)2F birefringece crystal:
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.3:3.2:6:1.8,
It is equal to BNBF, BaF2It is 1:0.3:0.2 with the mol ratio of NaF；
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into crystal growth
In platinum crucible in stove, it is heated to molten condition and obtains blend melt, stir 36 hours, by attempting seed-grain method
Determine the saturation point temperature of this blend melt；When temperature is risen to more than saturation point temperature 5 DEG C, seed crystal will be fixed with
Seed rod is slowly put in crystal growing furnace, makes the seed crystal of seed rod lower end touch blend melt surface or go deep into
In melt；Place and be incubated 20 minutes after seed crystal, then cool the temperature to saturation point temperature, simultaneously with 30 turns/
Minute speed of rotation rotary seed crystal rod, with the rate of temperature fall of 0.05 DEG C/day start cooling；Treat crystal growth to centimetre
After level size, by crystal lift-off liquid level, and it is down to room temperature with the rate of temperature fall of 30 DEG C/h, obtains a size of
The barium fluoborate sodium birefringece crystal of 20 × 20 × 15mm.
Being carried out by obtained crystal through test, it is 185-3000nm that result shows that it passes through scope.
Embodiment 3: flux growth metrhod growth Ba2Na3(B3O6)2F birefringece crystal
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.2:3.3:6:1.7,
It is equal to BNBF, BaF2It is 1:0.2:0.3 with the mol ratio of NaF.
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into crystal growth
In platinum crucible in stove, it is heated to molten condition and obtains blend melt, stir 24 hours, by attempting seed-grain method
Determine the saturation point temperature of this blend melt；When temperature is risen to more than saturation point temperature 2 DEG C, seed crystal will be fixed with
Seed rod is slowly put in crystal growing furnace, makes the seed crystal of seed rod lower end touch blend melt surface or go deep into
In melt；It is incubated 60 minutes after placing seed crystal, subsequently temperature is rapidly decreased to saturation point temperature, simultaneously with 5
Rev/min speed of rotation rotary seed crystal rod, with the rate of temperature fall of 0.5 DEG C/day start cooling；Treat crystal growth to li
After meter-sized, by crystal lift-off liquid level, and it be down to room temperature with the rate of temperature fall of 2 DEG C/h, obtain a size of
The barium fluoborate sodium birefringece crystal of 13 × 10 × 18mm.
Embodiment 4: flux growth metrhod growth Ba2Na3(B3O6)2F birefringece crystal:
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.65:5:6:4.3, etc.
It is same as BNBF, BaF2It is 1:0.65:2 with the mol ratio of NaF；
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into crystal growth
In platinum crucible in stove, it is heated to molten condition and obtains blend melt, stir 24 hours, by attempting seed-grain method
Determine the saturation point temperature of this blend melt；When temperature is risen to more than saturation point temperature 10 DEG C, seed crystal will be fixed with
Seed rod slowly put in crystal growing furnace, make the seed crystal of seed rod lower end touch blend melt surface or deep
Enter in melt；It is incubated 0 minute after placing seed crystal, then cools the temperature to saturation point temperature, simultaneously with 15 turns
/ minute speed of rotation rotary seed crystal rod, with the rate of temperature fall of 0.1 DEG C/day start cooling；Treat crystal growth to centimetre
After level size, by crystal lift-off liquid level, and it is down to room temperature with the rate of temperature fall of 25 DEG C/h, obtains a size of
The barium fluoborate sodium birefringece crystal of 15 × 15 × 10mm.
Embodiment 5: melt Czochralski grown Ba2Na3(B3O6)2F birefringece crystal
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.1:3.1:6:1.3,
It is equal to BNBF, BaF2It is 1:0.1:0.1 with the mol ratio of NaF；
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into platinum crucible
In, it is heated to molten condition and obtains blend melt, stir 48 hours, determine that above-mentioned mixing is melted by attempting seed-grain method
The saturation point temperature of body；When temperature is risen to more than saturation point temperature 2 DEG C, the seed rod being fixed with seed crystal is slowly put
Enter in crystal growing furnace, make the seed crystal of seed rod lower end touch blend melt surface or be deep in melt；Put
It is incubated 20 minutes after having put seed crystal, subsequently temperature is rapidly decreased to saturation point temperature, simultaneously with the rotation of 15 revs/min
Rotational speed rate rotary seed crystal rod, starts cooling with the rate of temperature fall of 0.2 DEG C/day, lifts with the rate of pulling of 0.1mm/h
Seed rod, crystal is gradually grown up；After crystal growth to centimeter-scale, by crystal lift-off liquid level, and with 20 DEG C/
Hour rate of temperature fall be down to room temperature, obtain the barium fluoborate sodium birefringece crystal of a size of 25 × 25 × 15mm.
Embodiment 6: melt Czochralski grown Ba2Na3(B3O6)2F birefringece crystal
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.3:3.2:6:1.8,
It is equal to BNBF, BaF2It is 1:0.3:0.2 with the mol ratio of NaF.
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into platinum crucible
In, it is heated to molten condition and obtains blend melt, stir 24 hours, determine that above-mentioned mixing is melted by attempting seed-grain method
The saturation point temperature of body；When temperature is risen to more than saturation point temperature 8 DEG C, the seed rod being fixed with seed crystal is slowly put
Enter in crystal growing furnace, make the seed crystal of seed rod lower end touch blend melt surface or be deep in melt；Put
It is incubated 60 minutes after having put seed crystal, subsequently temperature is rapidly decreased to saturation point temperature, simultaneously with the rotation of 10 revs/min
Rotational speed rate rotary seed crystal rod, starts cooling with the rate of temperature fall of 5 DEG C/day, lifts seed crystal with the rate of pulling of 10mm/h
Bar, crystal is gradually grown up；After crystal growth to centimeter-scale, by crystal lift-off liquid level, and with 2 DEG C/h
Rate of temperature fall be down to room temperature, obtain the barium fluoborate sodium birefringece crystal of a size of 25 × 25 × 30mm.
Embodiment 7: melt Czochralski grown Ba2Na3(B3O6)2F birefringece crystal
Raw materials used (analyzing pure):
Barium in the raw mixture of above-mentioned raw materials composition: sodium: boron: the mol ratio of fluorine is 2.65:5:6:4.3, etc.
It is same as BNBF, BaF2It is 1:0.65:2 with the mol ratio of NaF；
Specifically comprise the following steps that and after being weighed by above-mentioned raw materials, put into mixed grinding in mortar, be then charged into platinum crucible
In, it is heated to molten condition and obtains blend melt, stir 36 hours, determine that above-mentioned mixing is melted by attempting seed-grain method
The saturation point temperature of body；When temperature is risen to more than saturation point temperature 10 DEG C, by slow for the seed rod being fixed with seed crystal
Put in crystal growing furnace, make the seed crystal of seed rod lower end touch blend melt surface or be deep in melt；
It is incubated 0 minute after placing seed crystal, subsequently temperature is rapidly decreased to saturation point temperature, simultaneously with the rotation of 5 revs/min
Rotational speed rate rotary seed crystal rod, starts cooling with the rate of temperature fall of 0.05 DEG C/day, lifts with the rate of pulling of 0.5mm/h
Seed rod, crystal is gradually grown up；After crystal growth to centimeter-scale, by crystal lift-off liquid level, and with 30 DEG C/
Hour rate of temperature fall be down to room temperature, obtain the barium fluoborate sodium birefringece crystal of a size of 23 × 20 × 13mm.
As long as it practice, the present invention use raw material in containing barium compound purity be not less than 99.7% barium halide,
Brium carbonate, barium nitrate, barium acetate or barium oxalate；As long as compounds containing sodium purity is not less than the halogenation of 99.7%
Sodium, sodium carbonate, sodium nitrate, sodium sulphate, sodium acetate or sodium oxalate；As long as boron-containing compound purity is the lowest
In boric acid or the boron oxide of 99.7%；As long as fluorochemical purity is not less than sodium fluoride, the fluorine of 99.7%
Changing barium or the two mixture, wherein sodium fluoride and barium fluoride had both provided the sodium of part, barium element in raw material,
Act as again the flux of system.
Embodiment 8, to the Ba prepared by above-described embodiment2Na3(B3O6)2F crystal carries out refraction index test:
Use the crystal obtained in embodiment 1, cut out prism as shown in Figure 1 and carry out refraction index test.
Table 1 lists the refraction index test data of several incidence wave wavelength during 295K.Can be simulated by experimental data
Ba2Na3(B3O6)2The dispersion equation (Sellmier equation) of F crystal:
Utilize the equation can calculate embodiment 1 in the range of certain lambda1-wavelength (185-2000nm) to be obtained
The refractive index value of crystal.Fig. 2 is the graph of a relation of the crystal refractive index n and lambda1-wavelength λ of gained crystal.
Table 1 is as follows:
| Lambda1-wavelength λ (μm) | ne | no | Birefringence Δ n |
| 0.25365 | 1.57594 | 1.70496 | 0.12902 |
| 0.36342 | 1.53385 | 1.64416 | 0.11031 |
| 0.40466 | 1.52762 | 1.63528 | 0.10766 |
| 0.43583 | 1.52397 | 1.63008 | 0.10611 |
| 0.47999 | 1.52004 | 1.62449 | 0.10445 |
| 0.54607 | 1.51593 | 1.61859 | 0.10266 |
| 0.58756 | 1.51405 | 1.61586 | 0.10181 |
| 0.64385 | 1.51201 | 1.61284 | 0.10083 |
| 0.70652 | 1.51037 | 1.6104 | 0.10003 |
| 0.85211 | 1.50772 | 1.60619 | 0.09847 |
Wherein, noFor o light refracting light incident rate；neFor e light refracting light incident rate；λ is lambda1-wavelength；
Δ n is the birefringence of crystal of the present invention, Δ n=no-ne。
Embodiment 9: the barium fluoborate sodium birefringece crystal making Glan type prism of the use present invention:
Birefringece crystal BNBF-Canada's resin (or thin layer of air)-birefringece crystal BNBF constitutes Glan type prism
(Fig. 3), crystal refractive index ne<no；When incident light vertical prism surface feeding sputtering, o light and e light the most do not occur partially
Folding, the incidence angle on inclined-plane is equal to the angle of prism hypotenuse/facet surfaces with right-angle surface.Prism hypotenuse/facet surfaces and right-angle surface is made during making
Angle more than the critical angle on cemented surface of the o light, such o light will be totally reflected on cemented surface, and by rib
Coating in mirror right-angle surface is absorbed or is leaked by the o light window that leaks, and e light owing to refractive index is almost unchanged nothing
Deviation ground is from prism outgoing.
Embodiment 10: the barium fluoborate sodium birefringece crystal making Wollaston prism of the use present invention:
Wollaston prism (Fig. 4), two of which birefringence rib is constituted by two birefringece crystal BNBF prism bondings
The optical axis of mirror is mutually perpendicular to.Incident light impinges perpendicularly on prism end face, and in prism 1, o light and e light are with different
Speed is advanced in the same direction, and light is when prism 1 enters prism 2, and optical axis has turned 90 degree, and o light becomes e light,
E light becomes o light, and refractive index changes, and two bunch polarised lights are because occurring refraction two separately, after entering air,
It is all to be entered optically thinner medium by optically denser medium, obtains the two bunch polarised lights being spaced further apart.Birefringence is the biggest,
More be conducive to the separation of light beam.
Embodiment 11: the barium fluoborate sodium birefringece crystal making Rochon prism of the use present invention:
Rochon prism (Fig. 5), two of which birefringece crystal rib is constituted by two birefringece crystal BNBF prism bondings
The optical axis of mirror is mutually perpendicular to.Incident light vertical incidence prism, light in first prism (prism 1) along optical axis side
To propagation, birefringent phenomenon, two kinds of linearly polarized lights is not occurred all to advance in the same direction with o ray velocity.Enter the
After two prisms, optical axis turns over 90 degree, is parallel to the linearly polarized light of figure surface vibration at second prism (prism 2)
In be still that o light, this light is constant at two pieces of prism medium velocities, without the injection prism of deviation.It is perpendicular to drawing shake
Dynamic o light becomes e light in second prism, obtains the two bundles mutually perpendicular linearly polarized light of separate direction of vibration.
Claims (4)
1. the growing method of barium fluoborate sodium crystal, it is characterised in that it uses flux growth metrhod to grow crystal, described
Flux growth metrhod growth crystal step as follows:
By containing barium compound, compounds containing sodium, boron-containing compound and fluorochemical flux by barium therein:
Sodium: boron: mol ratio=2.1 of fluorine～2.65:3.1～5:6:1.3～the ratio mixed grinding of 4.3, loads crystal
In platinum crucible in growth furnace, it is heated to molten condition and obtains blend melt, stir 24～48 hours, by tasting
Examination seed-grain method determines the saturation point temperature of above-mentioned blend melt；When temperature is risen to more than saturation point temperature 2～10 DEG C,
The seed rod being fixed with seed crystal is put in crystal growing furnace so that it is touch blend melt surface or be deep into molten
Internal；It is incubated 0～60 minute after placing seed rod, cools the temperature to saturation point temperature subsequently, simultaneously with 5～30
Rev/min speed of rotation rotary seed crystal rod, under conditions of rate of temperature fall is 0.05～5 DEG C/day grow crystal；Treat
Crystal growth, to after centimeter-scale, by crystal lift-off liquid level, and is down to room with the rate of temperature fall of 2～30 DEG C/h
Temperature, obtains barium fluoborate sodium birefringece crystal；Described fluorochemical flux is the fluorine that purity is not less than 99.7%
Change sodium and barium fluoride mixture.
2. the growing method of the barium fluoborate sodium crystal as described in claim 1, it is characterised in that described baric
Compound is barium halide, brium carbonate, barium nitrate, barium acetate or the barium oxalate that purity is not less than 99.7%；Described contains
Sodium compound purity is not less than sodium halide, sodium carbonate, sodium nitrate, sodium sulphate, sodium acetate or the sodium oxalate of 99.7%；
Described boron-containing compound is boric acid or the boron oxide that purity is not less than 99.7%.
3. the growing method of barium fluoborate sodium crystal, it is characterised in that it uses crystal grown by Czochralski method from melt,
The step of described crystal grown by Czochralski method from melt is as follows:
By containing barium compound, compounds containing sodium, boron-containing compound and fluorochemical by barium therein: sodium: boron:
The ratio mixed grinding of mol ratio=2.1 of fluorine～2.65:3.1～5:6:1.3～4.3, loads in crystal growing furnace
Platinum crucible in, be heated to molten condition and obtain blend melt, stir 24～48 hours, by attempt seed-grain method
Determine the saturation point temperature of above-mentioned blend melt；When temperature is risen to more than saturation point temperature 2～10 DEG C, will be fixed with
The seed rod of seed crystal is slowly put in crystal growing furnace so that it is touches blend melt surface or is deep in melt；
It is incubated 0～60 minute after placing seed rod, cools the temperature to saturation point temperature subsequently, simultaneously with 5～30 revs/min
The speed of rotation rotary seed crystal rod of clock, rate of temperature fall be 0.05～5 DEG C/day cooling and 0.1～10mm/ hour lifting speed
Crystal is grown under conditions of rate lifting seed rod；After crystal growth to centimeter-scale, by crystal lift-off liquid level,
And it is down to room temperature with the rate of temperature fall of 2～30 DEG C/h, obtain barium fluoborate sodium birefringece crystal；Described is fluorine-containing
Compound flux is sodium fluoride and the barium fluoride mixture that purity is not less than 99.7%.
4. the growing method of the barium fluoborate sodium crystal as described in claim 3, it is characterised in that described baric
Compound is barium halide, brium carbonate, barium nitrate, barium acetate or the barium oxalate that purity is not less than 99.7%；Described contains
Sodium compound purity is not less than sodium halide, sodium carbonate, sodium nitrate, sodium sulphate, sodium acetate or the sodium oxalate of 99.7%；
Described boron-containing compound is boric acid or the boron oxide that purity is not less than 99.7%.
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