CN105543970B - Li7Cd4.5Ge4Se16Nonlinear optical crystal and preparation method and purposes - Google Patents
Li7Cd4.5Ge4Se16Nonlinear optical crystal and preparation method and purposes Download PDFInfo
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- CN105543970B CN105543970B CN201511017636.8A CN201511017636A CN105543970B CN 105543970 B CN105543970 B CN 105543970B CN 201511017636 A CN201511017636 A CN 201511017636A CN 105543970 B CN105543970 B CN 105543970B
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/46—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
Abstract
The present invention relates to Li7Cd4.5Ge4Se16Nonlinear optical crystal and preparation method and purposes；The Li7Cd4.5Ge4Se16Nonlinear optical crystal, which does not possess, symmetrical centre, belongs to rhombic system, space group is Pna21, its cell parameter is: α=β=γ=90 °；Li7Cd4.5Ge4Se16Nonlinear optical crystal uses high-temperature fusant spontaneous crystallization method or Bridgman-Stockbarge method for growing；The nonlinear optical crystal is easily grown up and transparent without parcel in growing crystals, and very fast with the speed of growth, cost is low, the advantages of easily obtaining large-size；The Li7Cd4.5Ge4Se16Nonlinear optical crystal has relatively wide transmission region, and hardness is larger, good mechanical property, not easily broken and deliquescence, it is easy to the advantages of processing and preserve；The Li7Cd4.5Ge4Se16Nonlinear optical crystal can be used for making device for non-linear optical.
Description
Technical field
The invention belongs to nonlinear optical crystal and its preparation and use field, more particularly to a kind of Li7Cd4.5Ge4Se16
Nonlinear optical crystal (Li7Cd4.5Ge4Se16Monocrystalline) and the Li7Cd4.5Ge4Se16The preparation method of monocrystalline and should
Li7Cd4.5Ge4Se16Monocrystalline is used for the purposes of the device for non-linear optical made.
Background technology
Crystal with nonlinear optical effect is referred to as nonlinear optical crystal.Here nonlinear optical effect refers to again
Frequently with frequency, difference frequency, parameter amplification etc. effect.Only the crystal without symmetrical centre has been only possible to nonlinear optical effect.Profit
With the nonlinear optical effect of crystal, second harmonic generator, upper and lower frequency converter, optical parametric oscillator etc. can be made
Device for non-linear optical.The laser that laser is produced can carry out frequency conversion by device for non-linear optical, so as to obtain more
The laser of useful wavelength, makes laser be more widely used.According to the difference of materials application wave band, ultraviolet light can be divided into
Area, visible and near-infrared region and mid-infrared light area nonlinear optical material three major types.Visible region and ultraviolet region it is non-
Linear optical crystal material can meet the requirement of practical application；It is such as practical in two frequencys multiplication (532nm) crystal mainly to have
KTP(KTiOPO4)、 BBO(β-SnB2O4)、LBO(LiB3O5) crystal；In frequency tripling (355nm) crystal it is practical have BBO,
LBO、 CBO(CsB3O5) available.And the nonlinear crystal development of infrared band is slow；The material of infrared light district is mostly
ABC2The chalcopyrite structure semiconductor material of type, such as AgGaQ2(Q=S, Se, Te), the light injury threshold of infrared non-linear crystal is too
Low and crystal growth is difficult, directly affects actual use.Middle-infrared band nonlinear optical crystal has in optoelectronic areas
Important application, such as it can by optical parametric oscillation or optically erasing means by the laser of near infrared band (such as
1.064 μm) extend to middle infrared；Can also centering infrared light district important laser (such as CO2Laser, 10.6 μm) carry out again
Frequently, this is significant for the laser for obtaining wavelength continuously adjustabe.Therefore the novel infrared non-linear of premium properties is found
Optical crystal material turns into one of difficult point and forward position direction of current nonlinear optical material research field.
We have studied Li first7Cd4.5Ge4Se16Crystal structure, and find Li7Cd4.5Ge4Se16With nonlinear optical
Learn performance.
The content of the invention
Present invention aims at provide a kind of Li7Cd4.5Ge4Se16Nonlinear optical crystal.
Another object of the present invention is to provide Li7Cd4.5Ge4Se16The preparation method of nonlinear optical crystal.
Still a further object of the present invention is to provide Li7Cd4.5Ge4Se16The purposes of nonlinear optical crystal.
Technical scheme is as follows:
The Li that the present invention is provided7Cd4.5Ge4Se16Nonlinear optical crystal, the Li7Cd4.5Ge4Se16Nonlinear optical crystal does not have
Symmetrical centre is had, belongs to rhombic system, space group is Pna21, its cell parameter is:A=
α=β=γ=90 °.
Li of the present invention7Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it gives birth to for high-temperature fusant spontaneous crystallization method
Long Li7Cd4.5Ge4Se16Nonlinear optical crystal, its step is:
By powdered Li7Cd4.5Ge4Se16Compound will be according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratios
The mixture of Li source materials, Cd source materials, Ge source materials and simple substance Se simple substance that example is mixed is heated to fusing, and in the fusing shape
Kept for 24-96 hours under state, room temperature is cooled to 1-10 DEG C/h of rate of temperature fall again afterwards, yellow transparent is obtained
Li7Cd4.5Ge4Se16Nonlinear optical crystal；
The powdered Li7Cd4.5Ge4Se16Preparing for compound is as follows:
By Li source materials, Cd source materials, Ge source materials and simple substance Se simple substance according to mol ratio Li:Cd:Ge:Se=7:
4.5:4:After 16 ratio is well mixed, 800-1050 DEG C of progress chemical synthesis is heated to, obtaining chemical formula is
Li7Cd4.5Ge4Se16Compound, powdered Li is ground to obtain through smashing to pieces7Cd4.5Ge4Se16Compound；
The Li source materials are lithium simple substance or lithium selenide；
The Cd source materials are cadmium simple substance or cadmium selenide:
The Ge source materials are germanium simple substance or two Germanium selenides.
Described chemical synthesis is synthesis in solid state.
Described Li7Cd4.5Ge4Se16Compound is prepared by following chemical equations:
(1) 7Li+4.5Cd+4Ge+16Se=Li7Cd4.5Ge4Se16；
(2)3.5Li2Se+4.5Cd+4Ge+12.5Se=Li7Cd4.5Ge4Se16；
(3) 7Li+4.5CdSe+4Ge+11.5Se=Li7Cd4.5Ge4Se16；
(4)7Li+4.5Cd+4GeSe2+ 8Se=Li7Cd4.5Ge4Se16；
(5)3.5Li2Se+4.5CdSe+4GeSe2=Li7Cd4.5Ge4Se16。
The Li that the present invention is provided7Cd4.5Ge4Se16Another preparation method of nonlinear optical crystal, it declines for crucible
Method grows Li7Cd4.5Ge4Se16Nonlinear optical crystal, its step is as follows:
By powdered Li7Cd4.5Ge4Se16Compound will be according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratios
The mixture of Li source materials, Cd source materials, Ge source materials and simple substance Se simple substance that example is mixed is put into crystal growing apparatus, is heated up
To melting sources, after raw material is completely melt, crystal growing apparatus is vertically declined with 0.1-10mm/h speed, in crystal life
Growth device carries out Li during declining7Cd4.5Ge4Se16Nonlinear optical crystal grows, and obtains yellow transparent
Li7Cd4.5Ge4Se16Nonlinear optical crystal, its growth cycle is 5-20 days；
The powdered Li7Cd4.5Ge4Se16Preparing for compound is as follows:
By Li source materials, Cd source materials, Ge source materials and simple substance Se simple substance according to mol ratio Li:Cd:Ge:Se=7:
4.5:4:After 16 ratio is well mixed, 800-1050 DEG C of progress chemical synthesis is heated to, obtaining chemical formula is
Li7Cd4.5Ge4Se16Compound, powdered Li is ground to obtain through smashing to pieces7Cd4.5Ge4Se16Compound；
The Li source materials are lithium simple substance or lithium selenide；
The Cd source materials are cadmium simple substance or cadmium selenide:
The Ge source materials are germanium simple substance or two Germanium selenides.
Described Li7Cd4.5Ge4Se16Compound is prepared by following chemical equations:
(1) 7Li+4.5Cd+4Ge+16Se=Li7Cd4.5Ge4Se16；
(2)3.5Li2Se+4.5Cd+4Ge+12.5Se=Li7Cd4.5Ge4Se16；
(3) 7Li+4.5CdSe+4Ge+11.5Se=Li7Cd4.5Ge4Se16；
(4)7Li+4.5Cd+4GeSe2+ 8Se=Li7Cd4.5Ge4Se16；
(5)3.5Li2Se+4.5CdSe+4GeSe2=Li7Cd4.5Ge4Se16。
The Li that the present invention is provided7Cd4.5Ge4Se16The purposes of nonlinear optical crystal, it is characterised in that should
Li7Cd4.5Ge4Se16Nonlinear optical crystal is used to prepare device for non-linear optical, and prepared device for non-linear optical is included
At least a branch of incidence electromagnetic radiation is passed through at least one piece Li7Cd4.5Ge4Se16Produced after nonlinear optical crystal at least a branch of
Frequency is different from the device of the output radiation of incidence electromagnetic radiation.
Above two method is used to obtain Li of the size for Centimeter Level7Cd4.5Ge4Se16Nonlinear optical crystal；Make
Large scale crucible is used, and extends growth period, then can obtain corresponding large-size Li7Cd4.5Ge4Se16Nonlinear optical crystal.
According to the crystallography data of crystal, crystal boule is oriented, cut by required angle, thickness and sectional dimension brilliant
Body, by crystal thang-kng mirror polish, you can used as device for non-linear optical, the Li7Cd4.5Ge4Se16Nonlinear optical crystal
Stable with physical and chemical performance, hardness is larger, and good mechanical property is not easily broken, is difficult deliquescence, it is easy to which processing and preservation etc. are excellent
Point；Li is furthermore provided for this present invention7Cd4.5Ge4Se16The purposes of nonlinear optical crystal, the Li7Cd4.5Ge4Se16Non-thread
Property optical crystal be used to prepare device for non-linear optical, the device for non-linear optical is comprising at least a branch of incidence electromagnetic radiation is led to
Cross at least one piece Li7Cd4.5Ge4Se16At least a branch of frequency is produced after nonlinear optical crystal different from incidence electromagnetic radiation
The device of output radiation.
The Li of the present invention7Cd4.5Ge4Se16Nonlinear optical crystal and its production and use has the effect that:
The Li of the present invention7Cd4.5Ge4Se16Nonlinear optical crystal has relatively wide transmission region, and hardness is larger, machinery
Performance is good, not easily broken and deliquescence, it is easy to the advantages of processing and preserve；The Li7Cd4.5Ge4Se16Nonlinear optical crystal can use
In making device for non-linear optical；And preparation method has in two：Crystal is easily grown up and transparent without parcel, with the speed of growth compared with
It hurry up, cost is low, the advantages of being readily available large-size crystal；
Brief description of the drawings
Fig. 1 is to use Li of the present invention7Cd4.5Ge4Se16A kind of typical nonlinear optics that nonlinear optical crystal is made
The fundamental diagram of device, wherein 1 is laser, 2 be incoming laser beam, and 3 be after crystal post processing and optical manufacturing
Li7Cd4.5Ge4Se16Nonlinear optical crystal, 4 be produced shoot laser beam, and 5 be filter plate.
Fig. 2 is Li of the present invention7Cd4.5Ge4Se16The structural representation of nonlinear optical crystal.
Embodiment
Embodiment 1, Li is prepared using high-temperature fusant spontaneous crystallization method7Cd4.5Ge4Se16Crystal:
Weigh 3.249 grams of Li2Se, 8.611 grams of CdSe and 9.222 gram of GeSe2(i.e. Li2Se:CdSe:GeSe2=
0.035mol:0.045mol:0.04mol), after uniform mixing, in the quartz glass tube for being fitted into Φ 12mm × 20mm, it is evacuated to
10-3After handkerchief, it is placed in after being encapsulated with oxyhydrogen flame in tubular type growth furnace, rises to 900 DEG C, constant temperature 72 hours is slow with 5 DEG C/h speed
Room temperature is cooled to, tubular type growth furnace is closed；Cut after after quartz ampoule cooling, can obtain the Li of yellow transparent7Cd4.5Ge4Se16It is brilliant
Body.
Embodiment 2, Li is prepared using Bridgman-Stockbarger method7Cd4.5Ge4Se16Crystal:
Weigh 0.486 gram of Li, 5.058 grams of Cd, 2.906 grams of Ge and 12.634 gram of Se (Li:Cd:Ge:Se=0.07mol:
0.045mol:0.04mol:0.16mol), after uniform mixing, in the quartz glass tube for being fitted into Φ 20mm × 30mm, it is evacuated to
10-3After handkerchief, it is placed in after being encapsulated with oxyhydrogen flame in crystal growing furnace, rising to 900 DEG C makes melting sources, after raw material is completely melt,
Grower was vertically declined with the speed of 0.1-10mm/ hours；After crystal growth terminates, grower was down to room with 20 hours
Temperature, obtains transparent Li7Cd4.5Ge4Se16Crystal.
After tested, the Li prepared by above-described embodiment 1-27Cd4.5Ge4Se16Nonlinear optical crystal belongs to rhombic system, empty
Between group be Pna21, its cell parameter is:α=β=γ=90 °,
Z=1,Density:4.457g/cm3, with frequency-doubled effect；Fig. 2 is the Li7Cd4.5Ge4Se16Nonlinear optics
The structural representation of crystal.
Embodiment 3:
Li obtained by embodiment 1-27Cd4.5Ge4Se16Crystal is not easily broken, it is easy to cut, polishing and preservation, not damp
Solution；By the Li obtained by embodiment 1-27Cd4.5Ge4Se16Crystal, is placed at position of the shown device of accompanying drawing 1 marked as 3, in room
Under temperature, with the Ho for adjusting Q:Tm:Cr:YAG laser makees light source, and incident wavelength is 2090nm infrared light, and output wavelength is
1045nm frequency doubled light, laser intensity is AgGaSe2Half.
Accompanying drawing 1 is to use Li of the present invention7Cd4.5Ge4Se16A kind of typical nonlinear optical that nonlinear optical crystal is made
The fundamental diagram of device is learned, wherein 1 is laser, 2 be incoming laser beam, and 3 be after crystal post processing and optical manufacturing
Li7Cd4.5Ge4Se16Nonlinear optical crystal, 4 be produced shoot laser beam, and 5 be filter plate；By laser 1 send into
Penetrate laser beam 2 and inject Li7Cd4.5Ge4Se16Monocrystal 3, produced shoot laser beam 4 obtains required by filter plate 5
Laser beam；
Use the Li of the present invention7Cd4.5Ge4Se16The device that nonlinear optical crystal makes can be a times frequency generator, upper,
Lower frequency converter, optical parametric oscillator.Photoparametric amplifier etc..
It should be noted that, the present invention can also directly use powdered Li7Cd4.5Ge4Se16The preparation of compound：I.e. by Li
Source material, Cd source materials, Ge source materials and simple substance Se simple substance are according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratio
After well mixed, 800-1050 DEG C of progress chemical synthesis is heated to, chemical formula is obtained for Li7Cd4.5Ge4Se16Compound, warp
Smash to pieces and grind to obtain powdered Li7Cd4.5Ge4Se16Compound；The preferred solid reaction process of chemical synthesis process of the present invention；
Li7Cd4.5Ge4Se16Compound can be prepared according to the following reaction formula：
(1) 7Li+4.5Cd+4Ge+16Se=Li7Cd4.5Ge4Se16；
(2)3.5Li2Se+4.5Cd+4Ge+12.5Se=Li7Cd4.5Ge4Se16；
(3) 7Li+4.5CdSe+4Ge+11.5Se=Li7Cd4.5Ge4Se16；
(4)7Li+4.5Cd+4GeSe2+ 8Se=Li7Cd4.5Ge4Se16；
(5)3.5Li2Se+4.5CdSe+4GeSe2=Li7Cd4.5Ge4Se16。
Above-mentioned powdered Li7Cd4.5Ge4Se16Li source materials in prepared by compound and its nonlinear chemical crystal can be lithium
Simple substance or lithium selenide；Cd source materials can be cadmium simple substance or cadmium selenide:Ge source materials can be germanium simple substance or two Germanium selenides.
Claims (7)
1. a kind of Li7Cd4.5Ge4Se16Nonlinear optical crystal, the Li7Cd4.5Ge4Se16Nonlinear optical crystal do not possess have it is symmetrical in
The heart, belongs to rhombic system, space group is Pna21, its cell parameter is:
α=β=γ=90 °.
2. Li described in a kind of claim 17Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it is that high-temperature fusant is spontaneous
Crystallisation grows Li7Cd4.5Ge4Se16Nonlinear optical crystal, its step is:
By powdered Li7Cd4.5Ge4Se16Compound will be according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratios are mixed
Li source materials, Cd source materials, the mixture of Ge source materials and Se simple substance be heated to fusing, and kept under the molten state
24-96 hours, room temperature is cooled to 1-10 DEG C/h of rate of temperature fall again afterwards, the Li of yellow transparent is obtained7Cd4.5Ge4Se16
Nonlinear optical crystal；
The powdered Li7Cd4.5Ge4Se16Preparing for compound is as follows:
By Li source materials, Cd source materials, Ge source materials and Se simple substance according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratio
After example is well mixed, 800-1050 DEG C of progress chemical synthesis is heated to, chemical formula is obtained for Li7Cd4.5Ge4Se16Compound,
Powdered Li is ground to obtain through smashing to pieces7Cd4.5Ge4Se16Compound；
The Li source materials are lithium simple substance or lithium selenide；
The Cd source materials are cadmium simple substance or cadmium selenide:
The Ge source materials are germanium simple substance or two Germanium selenides.
3. the Li as described in claim 27Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it is characterised in that described
Chemical synthesis is synthesis in solid state.
4. the Li as described in claim 27Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it is characterised in that described
Li7Cd4.5Ge4Se16Compound is prepared by following chemical equations:
(1) 7Li+4.5Cd+4Ge+16Se=Li7Cd4.5Ge4Se16；
(2)3.5Li2Se+4.5Cd+4Ge+12.5Se=Li7Cd4.5Ge4Se16；
(3) 7Li+4.5CdSe+4Ge+11.5Se=Li7Cd4.5Ge4Se16；
(4)7Li+4.5Cd+4GeSe2+ 8Se=Li7Cd4.5Ge4Se16；
(5)3.5Li2Se+4.5CdSe+4GeSe2=Li7Cd4.5Ge4Se16。
5. Li described in a kind of claim 17Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it gives birth to for Bridgman-Stockbarger method
Long Li7Cd4.5Ge4Se16Nonlinear optical crystal, its step is as follows:
By powdered Li7Cd4.5Ge4Se16Compound will be according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratios are mixed
Li source materials, Cd source materials, the mixture of Ge source materials and Se simple substance be put into crystal growing apparatus, be warming up to raw material and melt
Change, after raw material is completely melt, crystal growing apparatus is vertically declined with 0.1-10mm/h speed, decline in crystal growing apparatus
During carry out Li7Cd4.5Ge4Se16Nonlinear optical crystal grows, and obtains the Li of yellow transparent7Cd4.5Ge4Se16Nonlinear optical
Crystal is learned, its growth cycle is 5-20 days；
The powdered Li7Cd4.5Ge4Se16Preparing for compound is as follows:
By Li source materials, Cd source materials, Ge source materials and Se simple substance according to mol ratio Li:Cd:Ge:Se=7:4.5:4:16 ratio
After example is well mixed, 800-1050 DEG C of progress chemical synthesis is heated to, chemical formula is obtained for Li7Cd4.5Ge4Se16Compound,
Powdered Li is ground to obtain through smashing to pieces7Cd4.5Ge4Se16Compound；
The Li source materials are lithium simple substance or lithium selenide；
The Cd source materials are cadmium simple substance or cadmium selenide:
The Ge source materials are germanium simple substance or two Germanium selenides.
6. the Li as described in claim 57Cd4.5Ge4Se16The preparation method of nonlinear optical crystal, it is characterised in that described
Li7Cd4.5Ge4Se16Compound is prepared by following chemical equations:
(1) 7Li+4.5Cd+4Ge+16Se=Li7Cd4.5Ge4Se16；
(2)3.5Li2Se+4.5Cd+4Ge+12.5Se=Li7Cd4.5Ge4Se16；
(3) 7Li+4.5CdSe+4Ge+11.5Se=Li7Cd4.5Ge4Se16；
(4)7Li+4.5Cd+4GeSe2+ 8Se=Li7Cd4.5Ge4Se16；
(5)3.5Li2Se+4.5CdSe+4GeSe2=Li7Cd4.5Ge4Se16。
7. the Li described in a kind of claim 17Cd4.5Ge4Se16The purposes of nonlinear optical crystal, it is characterised in that should
Li7Cd4.5Ge4Se16Nonlinear optical crystal is used to prepare device for non-linear optical, and prepared device for non-linear optical is included
At least a branch of incidence electromagnetic radiation is passed through at least one piece Li7Cd4.5Ge4Se16Produced after nonlinear optical crystal at least a branch of
Frequency is different from the device of the output radiation of incidence electromagnetic radiation.
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| CN109518267A (en) * | 2019-01-07 | 2019-03-26 | 中国科学院理化技术研究所 | SrHgSnSe4Nonlinear optical crystal, its preparation and application |
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