CN103132147A - Nonlinear optical crystal and preparation method thereof - Google Patents

Nonlinear optical crystal and preparation method thereof Download PDF

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CN103132147A
CN103132147A CN2013100707183A CN201310070718A CN103132147A CN 103132147 A CN103132147 A CN 103132147A CN 2013100707183 A CN2013100707183 A CN 2013100707183A CN 201310070718 A CN201310070718 A CN 201310070718A CN 103132147 A CN103132147 A CN 103132147A
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crystal
nonlinear optical
linear optic
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samarium
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涂一帆
涂小牛
孔海宽
忻隽
郑燕青
施尔畏
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Shanghai Institute of Ceramics of CAS
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Shanghai Institute of Ceramics of CAS
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Abstract

The invention discloses a nonlinear optical crystal, which has a crystal structure the same as that of a YCa4O(BO3)3 crystal, and belongs to the field of a Cm space group and an m point group. The nonlinear optical crystal is a samarium-yttrium-calcium-oxygen borate crystal; the chemical formula of the nonlinear optical crystal is SmxY1-xCa4O(BO3)3, wherein x is more than 0 and less than 1; and the nonlinear optical crystal is obtained through a pulling method by adopting CaCO3, Y2O3, Sm2O3 and H3BO3 in stoichiometric proportion. The samarium-yttrium-calcium-oxygen borate crystal disclosed by the invention has good nonlinear optical property, can be used for manufacturing a laser nonlinear optical device and can increase the transformation and amplification efficiency of the laser nonlinear optical device by absorbing idler-frequency light with a specific wavelength.

Description

Non-linear optic crystal and preparation method thereof
Technical field
The present invention relates to a kind of non-linear optic crystal and preparation method thereof.
Background technology
Facing mankind severe energy problem, and nuclear fusion energy as a kind of inexhaustible, clean energy of there is no pollution, is the new forms of energy of ideals of human being.It is as the preferred fast ignition laser system of inertial confinement fusion technology that the optical parameter chirped pulse amplifies (OPCPA) technology, needs high quality, bigbore crystal frequency device.YCOB(YCa 4O (BO 3) 3) crystal has good non-linear optical property, can prepare simultaneously the crystal of large-size high-quality, be in the news and amplified (OPA) device for the optical parameter of OPCPA system and transform as high power frequency and use material, be expected to replace the crystal such as traditional KDP, LBO, BBO to obtain the more output of peak value and average energy.
The YCOB crystal belongs to non-centrosymmetrical oblique system, m point group, Cm spacer.In this crystalline structure, have two kinds of different Ca ions (Ca (l) and Ca (2)) case, form the octahedrons of distortion with six oxygen on every side, octahedra with have the BO of triangle configuration on every side 3Group is connected by sharing the top, angle, forms three-dimensional net structure.The same with Ca, the boron of three-fold coordination also has two kinds of cases of B (l) and B (2).Rare earth ion Y 3+Be positioned on the facet of crystallography structure cell, with six oxygen formation distorted octahedron structures on every side.Y 3+Ion place case is easy to replaced by other rare earth ions and do not change crystalline structure, and rear-earth-doped YCOB crystal (doping with rare-earth ions and ruthenium ion are close) has good non-linear optical property equally.
The amplification of laser in the non-linear optic crystal medium is that optical parameter amplification (OPA) technology is a kind of amplification process based on second order nonlinear effect, is with a strong pump light (ω 1) and one a little less than flashlight (ω 2) incide simultaneously in nonlinear crystal, they are under the condition that satisfies certain phase matched, and intercoupling produces an ideler frequency light (ω 3), make weak flashlight be amplified in this process, three's frequency relation is ω 1=ω 2+ ω 3Ideler frequency light to optical parameter amplification system in OPCPA absorbs, and suppresses the reverse of ideler frequency light, can improve the transformation efficiency of pump light, obtains stronger flashlight, thereby improves the transformation efficiency of OPCPA system.
Although the YCOB crystal has very high transmitance at 400nm to 2400nm wave band, it can not absorb the ideler frequency light of specific band well, and is lower at conversion and the amplification efficiency of OPCPA system, also can't be applied in the Laser-Nonlinear optics.
Summary of the invention
Therefore, purpose of the present invention can not absorb the ideler frequency light of specific band well for YCOB crystal in prior art, and conversion and the lower technical problem of amplification efficiency in the OPCPA system provide a kind of new non-linear optic crystal and preparation method thereof.The present invention is by mixing specific ion in the YCOB crystal, the absorptive character of regulation and control crystal absorb the ideler frequency light of specific band, to improve the YCOB crystal as the transformation efficiency of the OPCPA system of frequency translation element.
Non-linear optic crystal of the present invention has and YCa 4O (BO 3) 3The crystalline structure that crystal is identical belongs to the Cm spacer, and m point group, non-linear optic crystal of the present invention are specially samarium yttrium calcium oxygen borate crystal, and chemical formula is Sm xY 1-xCa 4O (BO 3) 3, be called for short the SYCOB crystal, wherein, 0＜x＜1, preferably, 0.05≤x≤0.95, more preferably, 0.3≤x≤0.95, further preferably, 0.5≤x≤0.75.SYCOB crystal of the present invention passes through Sm 3+Replace the Y in the YCOB crystal 3+Ion site, and do not change the original structure of YCOB crystal, guaranteed that crystal has good non-linear optical property equally.
In the present invention, when x=0.3, the uptake factor of described samarium yttrium calcium oxygen borate crystal on (31 °, 180 °) phase matched direction is 1.81cm -1Compare with the YCOB crystal, samarium yttrium calcium oxygen borate crystal makes this crystal possess simultaneously the absorptive character certain to specific wavelength laser in the situation that non-linear optical property is not affected substantially.
When x=0.5, the unit cell parameters of described samarium yttrium calcium oxygen borate crystal is
Figure BDA00002888759800021
Figure BDA00002888759800022
β=101.17 °, on (31 °, 180 °) phase matched direction, the uptake factor in the 1572nm place is 3.15cm -1Illustrated that samarium yttrium calcium oxygen borate crystal has very strong absorption at this wave band, be enough to suppress the refluence of ideler frequency light, can improve the transformation efficiency of laser amplifier device.Y wherein 3+And Sm 3+Occupy identical crystallographic site, all the position is positioned at the distorted octahedron center that is surrounded by 6 Sauerstoffatoms.Therefore, add Sm 3+Content is higher, although the non-linear optical property of crystal slightly descends, has but greatly strengthened crystal to ideler frequency Optical Absorption performance.Therefore, can determine concrete x value to the requirement of crystal property for related application, to obtain the Sm of different Sm/Y components xY 1-xCa 4O (BO 3) 3Crystal.
Samarium yttrium calcium oxygen borate crystal of the present invention has good non-linear optical effect (suitable with the YCOB crystal), high anti-damage threshold value, stable chemical property and deliquescent behaviours etc. not, simultaneously the laser of specific wavelength is had very strong sorption.This crystal is used for the Laser-Nonlinear optics, by absorbing ideler frequency light, suppresses inverse conversion and transform and amplification efficiency with the laser that improves device.
Another object of the present invention is to provide a kind of method for preparing samarium yttrium calcium oxygen borate crystal of the present invention.Method of the present invention specifically comprises the steps:
Steps A) take CaCO by stoichiometric ratio 3, Y 2O 3, Sm 2O 3And H 3BO 3, briquetting, sintering after mixing make the generation solid state reaction obtain raw materials of compound;
Step B) use iridium or platinum crucible, with described raw materials of compound heat fused, and insulation makes melt state stable, is cooled to the temperature of sowing, and the rotation seed crystal also begins pulling growth samarium yttrium calcium oxygen borate crystal;
Step C) after the growth of samarium yttrium calcium oxygen borate crystal finishes, crystal is broken away from melt, and make crystal be down to room temperature.
Wherein, steps A) in, described sintering is sintering 12～24 hours at 1000～1300 ℃ of temperature.
Step B) in, the described raw materials of compound heating temperature of fusion of 2～5 hours to 1400～1600 ℃; And it is stable to be incubated 2～24 hours and to make melt state; Be cooled to the temperature of sowing of 1380～1410 ℃, with the rotating speed of 10～30rpm rotation seed crystal and with the rate of pulling pulling growth samarium yttrium calcium oxygen borate crystal of 0.1～10mm/h.To use rare gas element such as the protections such as nitrogen or argon gas when adopting Iridium Crucible, avoid crucible generation oxidation.
Step C) in, the growth of described samarium yttrium calcium oxygen borate crystal finish to be through sowing, shouldering, the stage such as isometrical, crystal is down to room temperature with the speed of 20～100 ℃/h afterwards.
The present invention mixes samarium ion in the YCOB crystal, the Sm of acquisition xY 1-xCa 4O (BO 3) 3Crystal has some stronger absorption peaks at 1400nm～1600nm.The ideler frequency light (1588nm) that this crystal amplifies in (OPA) device the optical parameter that adopts 532nm pump light, 800nm flashlight has stronger absorption.Samarium yttrium calcium oxygen borate crystal of the present invention has good non-linear optical property, is used for making the Laser-Nonlinear optics, specific wavelength ideler frequency light is absorbed conversion and the amplification efficiency that can improve the Laser-Nonlinear optics.Simultaneously, the method that the present invention prepares samarium yttrium calcium oxygen borate crystal has good crystal property, can be easier to growing high-quality, large-sized Sm xY 1-xCa 4O (BO 3) 3Crystal.
Embodiment
Embodiment 1 Czochralski grown Sm 0.05Y 0.95Ca 4O (BO 3) 3Crystal (x=0.05) 0.05Sm 2O 3+ 0.95Y 2O 3+ 8CaCO 3+ 6H 3BO 3→ 2Sm 0.05Y 0.95Ca 4O (BO 3) 3+ 8CO 2+ 9H 2O
Be 99.99% CaCO with purity 3, Y 2O 3, Sm 2O 3And H 3BO 3Raw material is pressed the chemical formula batching, and raw material is briquetting after sufficiently mixing, obtains Sm at 1300 ℃ through 24 hours sintering 0.05Y 0.95Ca 4O (BO 3) 3Raw materials of compound.
Adopt the Frequency Induction Heating lifting furnace, raw materials of compound is placed in Iridium Crucible, with N 2As shielding gas, be warming up to 1465 ℃ through 2 hours 30 minutes and make the sintered material fusing, be incubated 4 hours and make melt stable, 1405 ℃ of the temperature of sowing.In process of growth, rotating speed adopts 20rpm, pull rate 0.5mm/h.
Through sowing, shouldering, after the isometrical stage, per hour adopting that the speed of 40 ℃ is cooled to room temperature, finally obtain Sm 0.05Y 0.95Ca 4O (BO 3) 3Crystal.
Sm 0.05Y 0.95Ca 4O (BO 3) 3Crystal in ideler frequency optical band absorption characteristic referring to table 1.
Table 1Sm 0.05Y 0.95Ca 4O (BO 3) 3Crystal is 1572 and the 1588nm uptake factor
Figure BDA00002888759800041
Embodiment 2 Czochralski grown Sm 0.3Y 0.7Ca 4O (BO 3) 3Crystal (x=0.3) 0.3Sm 2O 3+ 0.7Y 2O 3+ 8CaCO 3+ 6H 3BO 3→ 2Sm 0.3Y 0.7Ca 4O (BO 3) 3+ 8CO 2+ 9H 2O
Be 99.99% CaCO with purity 3, Y 2O 3, Sm 2O 3And H 3BO 3Raw material is pressed the chemical formula batching, and raw material is briquetting after sufficiently mixing, obtains Sm at 1250 ℃ through 24 hours sintering 0.3Y 0.7Ca 4O (BO 3) 3Raw materials of compound.
Adopt the Frequency Induction Heating lifting furnace, raw materials of compound is placed in Iridium Crucible, with N 2As shielding gas, be warming up to 1465 ℃ through 2 hours 30 minutes and make the sintered material fusing, be incubated 4 hours and make melt stable, 1390 ℃ of the temperature of sowing.In process of growth, rotating speed adopts 19rpm, pull rate 0.5mm/h.
Through sowing, shouldering, after the isometrical stage, per hour adopting that the speed of 40 ℃ is cooled to room temperature, finally obtain Sm 0.3Y 0.7Ca 4O (BO 3) 3Crystal.
Sm 0.3Y 0.7Ca 4O (BO 3) 3Crystal in ideler frequency optical band absorption characteristic referring to table 2.
Table 2 Sm 0.3Y 0.7Ca 4O (BO 3) 3Crystal is 1572 and the 1588nm uptake factor
Figure BDA00002888759800051
Embodiment 3 Czochralski grown Sm 0.5Y 0.5Ca 4O (BO 3) 3Crystal (x=0.5) 0.5Sm 2O 3+ 0.5Y 2O 3+ 8CaCO 3+ 6H 3BO 3→ 2Sm 0.5Y 0.5Ca 4O (BO 3) 3+ 8CO 2+ 9H 2O
Be 99.99% CaCO with purity 3, Y 2O 3, Sm 2O 3And H 3BO 3Raw material is pressed the chemical formula batching, and raw material is briquetting after sufficiently mixing, obtains Sm at 1200 ℃ through 20 hours sintering 0.5Y 0.5Ca 4O (BO 3) 3Raw materials of compound.
Adopt the Frequency Induction Heating lifting furnace, raw materials of compound is placed in Iridium Crucible, with N 2As shielding gas, be warming up to 1450 ℃ through 3 hours and make sintered material fusing, be incubated 4 hours melt is stablized, be cooled to 1395 ℃ of the temperature of sowing.In process of growth, rotating speed adopts 18rpm, pull rate 0.5mm/h.
Through sowing, shouldering, after the isometrical stage, per hour adopting that the speed of 50 ℃ is cooled to room temperature, finally obtain Sm 0.5Y 0.5Ca 4O (BO 3) 3Crystal.
Sm 0.5Y 0.5Ca 4O (BO 3) 3Crystal in ideler frequency optical band absorption characteristic referring to table 3.
Table 3 Sm 0.5Y 0.5Ca 4O (BO 3) 3Crystal is 1572 and the 1588nm uptake factor
Embodiment 4 Czochralski grown Sm 0.75Y 0.25Ca 4O (BO 3) 3Crystal (x=0.75) 0.75Sm 2O 3+ 0.25Y 2O 3+ 8CaCO 3+ 6H 3BO 3→ 2Sm 0.75Y 0.25Ca 4O (BO 3) 3+ 8CO 2+ 9H 2O
Be 99.99% CaCO with purity 3, Y 2O 3, Sm 2O 3And H 3BO 3Raw material is pressed the chemical formula batching, and raw material is briquetting after sufficiently mixing, obtains Sm at 1150 ℃ through 20 hours sintering 0.75Y 0.25Ca 4O (BO 3) 3Raw materials of compound.
Adopt the Frequency Induction Heating lifting furnace, raw materials of compound is placed in Iridium Crucible, with N 2As shielding gas, being warming up to 1440 ℃ through 2 hours 30 minutes is the sintered material fusing, is incubated 4 hours and makes melt stable, 1390 ℃ of the temperature of sowing.In process of growth, rotating speed adopts 20rpm, pull rate 0.5mm/h.
Through sowing, shouldering, after the isometrical stage, per hour adopting that the speed of 40 ℃ is cooled to room temperature, finally obtain Sm 0.75Y 0.25Ca 4O (BO 3) 3Crystal.
Sm 0.75Y 0.25Ca 4O (BO 3) 3Crystal in ideler frequency optical band absorption characteristic referring to table 4.
Table 4Sm 0.75Y 0.25Ca 4O (BO 3) 3Crystal is 1572 and the 1588nm uptake factor
Figure BDA00002888759800061
Embodiment 5 Czochralski grown Sm 0.95Y 0.05Ca 4O (BO 3) 3Crystal (x=0.95) 0.95Sm 2O 3+ 0.05Y 2O 3+ 8CaCO 3+ 6H 3BO 3→ 2Sm 0.95Y 0.05Ca 4O (BO 3) 3+ 8CO 2+ 9H 2O
Be 99.99% CaCO with purity 3, Y 2O 3, Sm 2O 3And H 3BO 3Raw material is pressed the chemical formula batching, and raw material is briquetting after sufficiently mixing, obtains Sm at 1130 ℃ through 20 hours sintering 0.95Y 0.05Ca 4O (BO 3) 3Raw materials of compound.
Adopt the Frequency Induction Heating lifting furnace, raw materials of compound is placed in Iridium Crucible, with N 2As shielding gas, be warming up to 1420 ℃ through 2 hours 30 minutes and make the sintered material fusing, be incubated 4 hours and make melt stable, 1385 ℃ of the temperature of sowing.In process of growth, rotating speed adopts 20rpm, pull rate 0.5mm/h.
Through sowing, shouldering, after the isometrical stage, per hour adopting that the speed of 40 ℃ is cooled to room temperature, finally obtain Sm 0.95Y 0.05Ca 4O (BO 3) 3Crystal.
Industrial applicability: samarium yttrium calcium oxygen borate crystal of the present invention has excellent non-linear optical property and good crystal property concurrently, is easy to the growing large-size crystal.In addition, also have near the good optical absorption characteristics of common ideler frequency optical band (1588nm), can be used for making laser frequency conversion, photoparametric amplifier spare etc.

Claims (8)

1. non-linear optic crystal, it has and YCa 4O (BO 3) 3The crystalline structure that crystal is identical belongs to the Cm spacer, and the m point group is characterized in that: described non-linear optic crystal is samarium yttrium calcium oxygen borate crystal, and chemical formula is Sm xY 1-xCa 4O (BO 3) 3, wherein, 0＜x＜1.
2. non-linear optic crystal as claimed in claim 1, is characterized in that: 0.05≤x≤0.95.
3. non-linear optic crystal as claimed in claim 1, is characterized in that: 0.3≤x≤0.95.
4. non-linear optic crystal as claimed in claim 1, is characterized in that: 0.5≤x≤0.75.
5. a method for preparing non-linear optic crystal claimed in claim 1, is characterized in that specifically comprising the steps:
Steps A) take CaCO by stoichiometric ratio 3, Y 2O 3, Sm 2O 3And H 3BO 3, briquetting, sintering after mixing make the generation solid state reaction obtain raw materials of compound;
Step B) use iridium or platinum crucible, with described raw materials of compound heat fused, and insulation makes melt state stable, is cooled to the temperature of sowing, and the rotation seed crystal also begins pulling growth samarium yttrium calcium oxygen borate crystal;
Step C) after the growth of samarium yttrium calcium oxygen borate crystal finishes, crystal is broken away from melt, and make crystal be down to room temperature.
6. method as claimed in claim 5 is characterized in that: steps A), described sintering is sintering 12～24 hours at 1000～1300 ℃ of temperature.
7. method as claimed in claim 5, is characterized in that, step B) in, the described raw materials of compound heating temperature of fusion of 2～5 hours to 1400～1600 ℃; And it is stable to be incubated 2～24 hours and to make melt state; Be cooled to the temperature of sowing of 1380～1410 ℃, with the rotating speed of 10～30rpm rotation seed crystal and with the rate of pulling pulling growth samarium yttrium calcium oxygen borate crystal of 0.1～10mm/h.
8. method as claimed in claim 5, is characterized in that, step C) in, crystal is down to room temperature with the speed of 20～100 ℃/h.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628138A (en) * 2013-12-05 2014-03-12 山东大学 Large-size mass terbium calcium oxide borate crystal, and growth and application of crystal
CN112281217A (en) * 2019-07-25 2021-01-29 中国科学院上海硅酸盐研究所 Nonlinear optical crystal and preparation method and application thereof

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Publication number Priority date Publication date Assignee Title
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CN101089240A (en) * 2006-06-13 2007-12-19 中国科学院福建物质结构研究所 Ytterbium mixed yttrium calcium borate tunable laser crystal and its preparation and application

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6859467B2 (en) * 2001-05-03 2005-02-22 The Regents Of The University Of California Electro-optic modulator material
CN101089240A (en) * 2006-06-13 2007-12-19 中国科学院福建物质结构研究所 Ytterbium mixed yttrium calcium borate tunable laser crystal and its preparation and application

Non-Patent Citations (1)

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Title
涂一帆等: "OPCPA用掺钐YCOB晶体的生长及性能研究", 《第十六届全国晶体生长与材料学术会议论文集-03激光和非线性光学晶体》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103628138A (en) * 2013-12-05 2014-03-12 山东大学 Large-size mass terbium calcium oxide borate crystal, and growth and application of crystal
CN112281217A (en) * 2019-07-25 2021-01-29 中国科学院上海硅酸盐研究所 Nonlinear optical crystal and preparation method and application thereof

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Application publication date: 20130605