CN102094242A - Novel dual-wavelength laser crystal of ytterbium activated sodium yttrium tungstate - Google Patents
Novel dual-wavelength laser crystal of ytterbium activated sodium yttrium tungstate Download PDFInfo
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- CN102094242A CN102094242A CN2009101129432A CN200910112943A CN102094242A CN 102094242 A CN102094242 A CN 102094242A CN 2009101129432 A CN2009101129432 A CN 2009101129432A CN 200910112943 A CN200910112943 A CN 200910112943A CN 102094242 A CN102094242 A CN 102094242A
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Abstract
A kind of ytterbium activation Yttrium Tungstate sodium novel dual-wavelength laser crystal, is related to field of laser crystal materials. The chemical formula of the crystalline material is that Yb3+:NaY (WO4) 2 belongs to tetragonal crystal system I41/a, and cell parameter is
α=β=γ=90 °,
Z=2, Dx=6.62Dm=6.51g/cm3. Using Y2O3, Yb2O3 and analytically pure WO3, Na2CO3 of 4N as raw material, Yb3+:NaY (WO4) 2 raw material is obtained by high temperature solid state reaction, goes out to be greater than the crystal of 90mm using Czochralski grown under normal pressure atmosphere. The material exports for realizing~1.0 mu m waveband dual-wavelength lasers, is applied to Terahertz pumping source.
Description
Technical field
The present invention relates to field of laser crystal materials.
Background technology
THz wave is an electromagnetic radiation zone that has very much scientific research value but fully do not research and develop as yet.At present, the THz ripple mainly is to adopt optical technology and two kinds of methods of electronics technology to produce.
The method that electronic technology produces the THz ripple has backward wave oscillator, gunn and Bloch vibrator, unbound electron and QCL etc., but all exist some that technical bottleneck to be solved is arranged, or effect is low, the life-span short, or bulky, energy consumption height, operation and maintenance cost are comparatively expensive, not practicability, commercialization promptly allows to commercialization mostly as yet, also all is difficult to extensively popularize.Optical technology mainly contains THz ripple gas laser, and is relevant with ultrashort laser pulse, can produce broadband subpicosecond THz radiating optical rectification, photoconduction and plasma body four-wave mixing, nonlinear optics difference frequency, the methods such as parametric oscillation relevant with lattice vibration.Compare with other technology, the nonlinear difference process can produce the single-frequency THz ripple of the higher relevant wideband adjustable of power, great advantage is not have threshold value, equipment is simple, compact construction, do not need expensive pump arrangement, can produce the THz wave radiation of higher-wattage, even can obtain the THz harmonic tuning scope wideer than terahertz-wave parametric oscillator.
The key problem in technology that the difference frequency method produces the THz ripple is to obtain pump light and the flashlight (wavelength is more or less the same in 10nm) that power is higher, wavelength ratio is more approaching, and have bigger second order nonlinear coefficient, and in THz ripple scope the little nonlinear difference crystal of uptake factor.
The laser that Yb activated laser crystals produces at～1 μ m place is wideband adjustable, is expected to produce dual-wavelength laser output, can be used as pump light and flashlight in the difference frequency method.With Nd
3+The activated laser crystals is compared, and it also has following many advantages: (1) level structure is the simplest, and ground state is only arranged
2F
7/2And excited state
2F
5/2, do not have excited state absorption and last conversion, the light conversion efficiency height; (2) absorption band is in 0.9～1.1um scope, and the live width broad can effectively be coupled with the LD pumping source; (3) pumping and optical maser wavelength are very approaching, and the quantum defective is low, have big intrinsic lasing efficiency, and quantum yield is up to 90% in theory; (4) pumping and upper laser level are very close, and the thermal load that radiationless relaxation causes is low, only for mixing Nd
3+/ 3rd of a material; (5) fluorescence lifetime is long, for mixing Nd
3+Three times of material help energy storage more; (6) higher concentration that can mix.
What at present both at home and abroad the dual-wavelength laser crystal of research report adopted mostly is the Nd active ions, and its wavelength difference is generally greater than 10nm, and is non-tunable, and we are at Yb
3+: GdAl
3(BO
3)
4＜YbGAB〉realized the dual-wavelength laser output of watt level on the crystal, its wavelength difference has only 5nm, and Yb is broadband emission, and wavelength-tunable has good novelty, does not see correlative study and patent report at present.
NaY (WO
4)
2＜NYW〉crystal belongs to tetragonal system, has good physical and chemical performance, be insoluble to strong acid and strong base, hardness is big, the crystal congruent melting, can adopt to lift the large size gem-quality crystal takes place, and rare-earth activated crystal having bigger absorption and emission cross section at corresponding wave band, is a kind of outstanding laser host therefore.The Yb that from accompanying drawing, is tested
3+: NaY (WO
4)
2In crystalline absorption and the emitting fluorescence spectrogram, visible crystals has bigger emission cross section (10 at the 970nm place
-20Cm
2), help adopting the pumping of business-like LD pumping source to realize laser operation efficiently.Have wide emission at 970～1050nm wave band, halfwidth reaches 40nm, and its emission cross section is 10
-20Cm
2, help realizing tunable dual-wavelength laser output, so Yb
3+: NaY (WO
4)
2It will be a kind of outstanding dual-wavelength laser crystal that can be applied to the thz laser pumping source.
Include abundant physics and chemical information in THz wave and the matter interaction, compare with conventional light source, have unique, excellent characteristic such as coherency, low energy, high-penetrability, not damaged, all have huge scientific research value and wide application prospect on basis such as physics, chemistry, uranology, life science and medical science and safety inspection, medical imaging, environmental monitoring, food test, radio astronomy, satellite communications and weapon guidance and applied research field.In case succeed in developing, crystal of being studied and device thereof are pushed to new high-tech industry market, will produce considerable economic benefit; Can also be used to the long-range detection chemical substance, in anti-chemical warfare and environment protection, play critical effect.
Summary of the invention
The objective of the invention is to disclose the laser crystal material Yb of a kind of can the realization～1.0 mu m waveband dual-wavelength lasers output
3+: NaY (WO
4)
2
Realize the object of the invention technical scheme:
1. a ytterbium activates aluminic acid gadolinium calcium novel dual-wavelength laser crystals, and the chemical formula of this crystalline material is Yb
3+: NaY (WO
4)
2, belong to tetragonal system I4
1/ a, unit cell parameters is a=b=5.205
C=11.25
α=β=γ=90 °, V=304.81
Z=2, D
x=6.62, D
m=6.51g/cm
3
2. the preparation method of the laser crystal material of an item 1 is characterized in that: the Y that adopts 4N
2O
3, Yb
2O
3With analytically pure WO
3, Na
2CO
3As raw material, obtain Yb by high temperature solid state reaction
3+: NaY (WO
4)
2Raw material adopts the gem-quality crystal of Czochralski grown size greater than 90mm under normal pressure atmosphere.
3. the purposes of the laser crystal material of an item 1, this material are used for realizing the output of～1.0 mu m waveband dual-wavelength lasers, are applied to the Terahertz pumping source.
Description of drawings
Fig. 1: Yb:NaY (WO4) 2 crystal;
Fig. 2: crystalline room temperature abosrption spectrogram;
Fig. 3: crystalline room temperature fluorescence emmission spectrum figure;
Fig. 4: crystalline Laser Experiments setting drawing;
Embodiment:
Embodiment one: Yb
3+: NaY (WO
4)
2The crystalline growing and preparing
The used instrument of crystal pulling growth is the intermediate frequency lifting furnace of DJL-400, and the intermediate frequency power supply model is KGPF25-0.3-2.5.Adopt the thermopair of Pt/Pt-Rh and the Ou Lubiao temperature control that model is 815EPC.The crucible that is adopted is the iridium crucible of Φ 55mm * 70mm, and used raw material is the Y of 4N
2O
3, Yb
2O
3With analytically pure WO
3, Na
2CO
3As raw material.According to following chemical equation preparation raw material:
(1-x)Y
2O
3+xYb
2O
3+Na
2CO
3+4WO
3→2NaY
(1-x)Yb
x(WO
4)
2+CO
2x＝1at％～20at％。Raw material is mixed, be pressed into sheet, put platinum crucible into, insert in the ordinary sinter stove, slowly be warmed up to 850 ℃, keep 48h with 150 ℃/h, repeat this process, put into high temperature sintering furnace then at 1100 ℃ of following constant temperature sintering 72h, take out polycrystal, until X-ray powder diffraction with till standard card conforms to fully.
Raw material is packed in the platinum crucible of Φ 55mm * 70mm, be warmed up to the temperature higher 50 ℃ than fusing point, constant temperature 1～2 hour makes the raw material fusing fully.The crystal of being grown with platinum filament nature nucleation is as the large-sized gem-quality crystal of seeded growth.In the process of growth, the rate of pulling of seed rod is 1.3～1.5mm/h, rate of temperature fall is 2～10 ℃/h, the slewing rate of seed rod is 12～20r.p.m., behind the growth ending crystal is lifted from liquid level, speed with 10～30 ℃/h is reduced to room temperature, obtains being of a size of the transparent crystals of φ 20mm * 100mm, then under oxygen atmosphere high temperature annealing to eliminate oxygen defect.
Embodiment two: Yb
3+: NaY (WO
4)
2The crystalline Laser Experiments
Process the high-quality Yb that is of a size of 3mm * 3mm * 5mm
3+: NaY (WO
4)
2Quartz crystal device, the LD semiconductor laser that adopts 970nm carries out Laser Experiments as pumping source.Experimental installation as shown in drawings.The LD pumping source is decomposed into two-way crossed nicols by adjustable beam splitter pumping source carries out pumping to crystal, and outgoing mirror is adjustable with respect to the crystalline lateral axis, so that can produce dual-wavelength laser synchronously.Back two look planar cavity mirrors are high anti-at 1020-1080nm, and are high saturating at pumping wavelength 970nm; The radius of output concave mirror is 5cm, and is the transmitance at 1020-1080nm place adjustable (can be 2.5%, 4% and 6%), high anti-at pumping wavelength 970nm place.
Claims (3)
1. a ytterbium activates wolframic acid yttrium sodium novel dual-wavelength laser crystals, and it is characterized in that: the chemical formula of this crystalline material is Yb:NaY (WO
4)
2Belong to tetragonal system I4
1/ a, unit cell parameters is
α=β=γ=90 °,
Z=2, D
x=6.62D
m=6.51g/cm
3
2. the preparation method of the laser crystal material of a claim 1 is characterized in that: the Y that adopts 4N
2O
3, Yb
2O
3With analytically pure WO
3, Na
2CO
3As raw material, obtain Yb by high temperature solid state reaction
3+: NaY (WO
4)
2Raw material adopts the crystal of Czochralski grown size greater than 90mm under normal pressure atmosphere.
3. the purposes of the laser crystal material of a claim 1 is characterized in that: realize the output of～1.0 mu m waveband dual-wavelength lasers, be applied to the Terahertz pumping source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101129432A CN102094242A (en) | 2009-12-11 | 2009-12-11 | Novel dual-wavelength laser crystal of ytterbium activated sodium yttrium tungstate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101129432A CN102094242A (en) | 2009-12-11 | 2009-12-11 | Novel dual-wavelength laser crystal of ytterbium activated sodium yttrium tungstate |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
| CN110230101A (en) * | 2019-07-17 | 2019-09-13 | 江西理工大学 | Prepare method of the rare earth-doped calcium tungstate crystal for quantitative correction element |
-
2009
- 2009-12-11 CN CN2009101129432A patent/CN102094242A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194788A (en) * | 2013-04-17 | 2013-07-10 | 清华大学 | Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band |
| CN103194788B (en) * | 2013-04-17 | 2016-03-23 | 清华大学 | The preparation of Terahertz frequency range anisotropic medium crystal, sign and application method |
| CN110230101A (en) * | 2019-07-17 | 2019-09-13 | 江西理工大学 | Prepare method of the rare earth-doped calcium tungstate crystal for quantitative correction element |
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Application publication date: 20110615 |