CN104630890A - Self-frequency multiplication laser crystal neodymium-doped calcium pyroniobate - Google Patents
Self-frequency multiplication laser crystal neodymium-doped calcium pyroniobate Download PDFInfo
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- CN104630890A CN104630890A CN201510074175.1A CN201510074175A CN104630890A CN 104630890 A CN104630890 A CN 104630890A CN 201510074175 A CN201510074175 A CN 201510074175A CN 104630890 A CN104630890 A CN 104630890A
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Abstract
The invention provides self-frequency multiplication laser crystal neodymium-doped calcium pyroniobate. A pulling method is adopted, the growth parameters are as follows: the growth temperature is 1470-1500 DEG C, the pulling velocity is 0.4-3mm/hour, the rotation speed is 5-20rpm, the annealing speed is 15-50 DEG C/hour, and Nd<3+>:SrCaNb2O7 crystal with large size and excellent quality can be grown. The crystal belongs to an orthorhombic system and a Cmc21 space group, and the crystal cell parameter is as shown in the specification. The crystal has the characteristics of moderate mechanical property and thermal energy, good spectral property, large effective non-linear coefficient and the like, and is a relatively good self-frequency multiplication laser crystal material.
Description
Technical field
The present invention relates to technical field of optoelectronic functional materials, especially relate to a kind of laser crystal material as the operation material in solid laser.
Background technology
Self-frequency doubling laser crystal be one roughly the same time there is the multifunctional crystal of laser and non-linear effect.It is little, easy to adjust that all solid state laser made with laser self frequency-doubling crystal has volume, and stability height waits many merits, can be used in the numerous areas such as spectroscopy, biomedicine, military affairs.
1969, the Johnson etc. of U.S.'s Bell Laboratory invented First self-frequency-doubling laser.They are at laser self frequency-doubling crystal Tm
3+: LiNbO
3in achieve first 1853.2nm to 926.6nm self-frequency-doubling laser running.Thereafter, other investigators are at LiNbO
3in mix Nd
3+ion, achieves with xenon flash lamp pumping and operates from frequency multiplication.But LiNbO
3its practical application of the second harmonic output rating of crystal and the cause influence such as light injury threshold is low.
1981, Soviet scientists succeeded in developing Nd
0.2y
0.8al
3(BO
3)
4(NYAB) crystal, and the self-frequency-doubling laser running obtaining 1320nm to 660nm with flash lamp pumping.Due to this crystal frequency multiplication export near wave band (532nm) exist an absorption peak, make from 1064nm frequency multiplication be 532nm self-frequency-doubling laser running be difficult to realize.1986, Lu Baosheng etc. were by adjustment Nd
3+/ Y
3+mol ratio, achieve NYAB crystal exporting from frequency multiplication from 1064nm to 532nm in the world first.NYAB crystal weak point is the monocrystalline not easily obtaining high optical quality, and this is not mainly because NYAB is the homogenous solid solution of NAB and YAB crystal, and NAB crystal belongs to oblique system, and YAB crystal belongs to trigonal system.This just causes the ununiformity of NYAB crystal, is difficult to solve by improving the measures such as crystal growth condition.In addition, there is stronger absorption at 530nm frequency doubled light place in NYAB crystal, unfavorable to exporting from frequency doubling green light.This all has influence on the practical of NYAB self-frequency-doubling laser.Although scientists has carried out going deep into and studying widely to self-frequency doubling laser crystal material, up to now, not yet obtain the self-frequency doubling laser crystal with practical value, therefore the research and development of novel self-frequency doubling laser crystal are still extensively by the concern of investigators.
The burnt calcium niobate strontium of neodymium-doped (Nd
3+: CaSrNb
2o
7) crystal belongs to rhombic system, is a kind of ideal self-frequency doubling laser crystal material.This crystal has larger Clock Multiplier Factor, and the 3-5 being KDP doubly, can realize the phase matched under room temperature; The neodymium ion of doping replaces the position of calcium and strontium, easily realizes laser generation and produces; In addition, this crystal has natural complete cleavage surface, can save the courses of processing such as cutting, polishing.Thus, the burnt calcium niobate strontium of neodymium-doped (Nd
3+: CaSrNb
2o
7) crystal is expected to become a kind of novel self-frequency doubling laser crystal material.
Summary of the invention
Object of the present invention is just to develop a kind of new self-frequency doubling laser crystal.It is that one directly can use laser diode (LD) pumping, exports the crystalline material of 1068nm and 534nm wavelength laser.
Neodymium-doped burnt calcium niobate strontium self-frequency doubling laser crystal Nd
3+: CaSrNb
2o
7, belong to rhombic system, Cmc2
1spacer, its unit cell parameters is:
dc=4.84g/cm
3.Neodymium ion replaces calcium and strontium ion in lattice, and its doping content is between 0.5at.% ~ 15at.%.
A kind of preparation method of self-frequency doubling laser crystal Nd-doped burnt calcium niobate strontium: adopt crystal pulling method to carry out the growth of this crystal.Will by Ca
1-xsr
1-xnd
2xnb
2o
7(x=0.25-7.5) SrCO that stoichiometric ratio precise is good
3, CaCO
3, Nd
2o
3and Nb
2o
5mixed grinding is even, after compressing tablet, in 800 DEG C of solid state reactions 24 hours in retort furnace; After taking-up, then be ground, compressing tablet, be warming up to 1200 DEG C of reactions 24 hours.Synthetic above sample is loaded φ 45 × 35mm
3iraurite crucible in, put into lifting furnace, adopt crystal pulling method, at N
2in atmosphere, growth temperature is 1470-1500 DEG C, and crystal rotation is 5-20 rev/min, when pulling rate is 0.4-3 milli m/h, has grown high-quality Nd
3+: CaSrNb
2o
7crystal.The crystal boundary obtained, optical homogeneity are good.
Concrete chemical equation is as follows:
(1-x)CaCO
3+(1-x)SrCO
3+xNd
2O
3+Nb
2O
5＝Ca
1-xSr
1-xNd
2xNb
2O
7+(2-2x)CO
2↑
Material purity used and producer as follows:
| Medicine name | Purity | Producer |
| CaCO 3 | 99.50％ | Shanghai nasal mucus connection chemical reagent factory |
| SrCO 3 | 99.50％ | Shanghai nasal mucus connection chemical reagent factory |
| Nb 2O 5 | 99.95％ | Solution on Chemical Reagents in Shanghai company of Chinese Medicine group |
| Nd 2O 3 | 99.99％ | Solution on Chemical Reagents in Shanghai company of Chinese Medicine group |
Utilize four-circle diffractometer to the Nd grown out
3+: CaSrNb
2o
7crystal carries out Diffraction Data Collection, resolves its structure, and result shows that this crystal belongs to rhombic system, Cmc2
1spacer, unit cell parameters is:
To Nd
3+: CaSrNb
2o
7crystal carries out the measurement of absorption under room temperature, fluorescence and fluorescence lifetime.As can be seen from its absorption spectrum: crystal has comparatively large wider absorption band near 804nm, and the full width at half maximum at peak reaches 20.7nm, and it is 2.23 × 10 at the absorption cross section at peak value 804nm place
-20cm
2.From Nd
3+: CaSrNb
2o
7in the room temperature fluorescence spectrum of crystal, this crystal visible has a wider emission peak between 1020 ~ 1177nm, and emission peak is positioned at 1068nm, and the full width at half maximum at peak is 24.49nm, and emission cross section is 3.32 × 10
-20cm
2; Fluorescence lifetime is 201 μ s.
Near 804nm, have stronger absorption be very applicable to AsGaAl semiconductor laser pumping, be conducive to the absorption of crystal to pump light, larger peak width at half height reduces AsGaAl semiconductor laser to the strict demand of the conditions such as temperature simultaneously.This crystal has larger emission cross section and larger fluorescence lifetime, can accumulate more particle, add energy storage at upper energy level, is conducive to the raising of device output power and output energy.Powder nonlinear optical coefficients measure and show that its nonlinear second-order optical susceptibility is approximately the 3-5 of KDP doubly.Therefore, Nd
3+: CaSrNb
2o
7crystal can obtain larger basic frequency laser and double-frequency laser exports, and is a kind of high conversion efficiency, low cost, high optical quality and the self-frequency doubling laser crystal having actual application prospect and use value.
In sum, neodymium-doped of the present invention burnt calcium niobate strontium self-frequency doubling laser crystal, can use Czochralski grown, growth technique is simple, and raw material is cheap and easy to get, and production cost is low.The crystal obtained has machinery and the advantage such as thermal property is moderate, absorption bands is wide, emission cross section is large and Clock Multiplier Factor is larger.Semiconductor laser can be used to carry out pumping, obtain the Laser output of 1068nm, exported by the green glow that can obtain 534nm from frequency multiplication, therefore this crystal is expected as the good self-frequency doubling laser crystal material of one.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, but should not limit the scope of the invention with this.
A kind of self-frequency doubling laser crystal Nd-doped burnt calcium niobate strontium, realize experiment optimal way of the present invention as follows.
Embodiment 1: Czochralski grown neodymium-doped is the Nd of 5.0at.%
3+: CaSrNb
2o
7crystal
By SrCO good for stoichiometrically precise
3, CaCO
3, Nd
2o
3and Nb
2o
5mixed grinding is even, after compressing tablet, in 800 DEG C of solid state reactions 24 hours in retort furnace, after taking-up, then is ground, compressing tablet, is warming up to 1200 DEG C of reactions 24 hours.Synthetic above sample is loaded
iraurite crucible in, put into lifting furnace, adopt crystal pulling method, at N
2in atmosphere, growth temperature is 1470-1500 DEG C, and crystal rotation is 10 revs/min, when pulling rate is 1 milli m/h, has grown and has been of a size of
high-quality Nd
3+: CaSrNb
2o
7crystal.By ICP (plasma emission spectrum) test analysis, Nd
3+the concentration of ion is 4.05at.%.
Claims (3)
1. a self-frequency doubling laser crystal Nd-doped burnt calcium niobate strontium, is characterized in that: the molecular formula of this crystal is Nd
3+: CaSrNb
2o
7, belong to rhombic system, spacer is Cmc2
1, unit cell parameters is:
d
c=4.84g/cm
3.
2. a kind of self-frequency doubling laser crystal Nd-doped burnt calcium niobate strontium as claimed in claim 1, is characterized in that: Nd
3+ion is as dopant ion, and replace the crystallographic site of calcium and strontium ion, its doping content is 0.5at.% ~ 15at.%.
3. the preparation method of a kind of self-frequency doubling laser crystal Nd-doped burnt calcium niobate strontium described in a claim 1 or 2, it is characterized in that: this crystal adopts Czochralski grown, growth temperature 1470-1500 DEG C, crystal rotation is 5-20 rev/min, pulling rate is 0.5-3 milli m/h, and annealing speed is 15-50 DEG C/h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425153A (en) * | 2018-02-05 | 2018-08-21 | 上海应用技术大学 | One kind mixing chromium niobic acid aluminium calcium tunable laser crystal and preparation method thereof |
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|---|---|---|---|---|
| CN1847471A (en) * | 2005-04-05 | 2006-10-18 | 中国科学院福建物质结构研究所 | Self-frequency doubling laser crystal Nd-doped calcium niobate |
| CN1847470A (en) * | 2005-04-05 | 2006-10-18 | 中国科学院福建物质结构研究所 | Non-linear optical crystal calcium niobate |
| CN101174756A (en) * | 2007-11-30 | 2008-05-07 | 中国科学院上海光学精密机械研究所 | Calcium niobate laser crystal doped with ytterbium and method for producing the same |
| CN101212120A (en) * | 2006-12-27 | 2008-07-02 | 中国科学院福建物质结构研究所 | Neodymium doped strontium barium niobate laser crystal, producing method, and purpose |
| WO2013126432A1 (en) * | 2012-02-21 | 2013-08-29 | California Institute Of Technology | Axially-integrated epitaxially-grown tandem wire arrays |
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2015
- 2015-02-12 CN CN201510074175.1A patent/CN104630890B/en active Active
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| CN1847471A (en) * | 2005-04-05 | 2006-10-18 | 中国科学院福建物质结构研究所 | Self-frequency doubling laser crystal Nd-doped calcium niobate |
| CN1847470A (en) * | 2005-04-05 | 2006-10-18 | 中国科学院福建物质结构研究所 | Non-linear optical crystal calcium niobate |
| CN101212120A (en) * | 2006-12-27 | 2008-07-02 | 中国科学院福建物质结构研究所 | Neodymium doped strontium barium niobate laser crystal, producing method, and purpose |
| CN101174756A (en) * | 2007-11-30 | 2008-05-07 | 中国科学院上海光学精密机械研究所 | Calcium niobate laser crystal doped with ytterbium and method for producing the same |
| WO2013126432A1 (en) * | 2012-02-21 | 2013-08-29 | California Institute Of Technology | Axially-integrated epitaxially-grown tandem wire arrays |
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| JUAN GENG 等: "Tunable white-light-emitting Sr2-xCaxNb2O7:Pr3+ phosphor by adjusting the concentration of Ca2+ ion", 《OPTICAL MATERIALS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425153A (en) * | 2018-02-05 | 2018-08-21 | 上海应用技术大学 | One kind mixing chromium niobic acid aluminium calcium tunable laser crystal and preparation method thereof |
| CN108425153B (en) * | 2018-02-05 | 2020-06-09 | 上海应用技术大学 | Chromium-doped aluminum calcium niobate tunable laser crystal and preparation method thereof |
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| CN104630890B (en) | 2017-03-01 |
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