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1.
AlargesizeandhighopticalqualityNd∶GdCOBcrystalwasobtainedbyCZpullingmethod.Thecrystalswerecutintwosamplewiththesamedimensionof3× 3× 8mm3 .TheoscillatinglasertravelsthroughonesamplealongX axisandtheotheralongY axis〔theanglesbetweenthecrystallophysicaxisand…  相似文献   

2.
AlargesizeandhighopticalqualityNd∶GdCOBcrystalwasobtainedbyCZpullingmethod.Thecrystalswerecutintwosamplewiththesamedimensionof3×3×8mm3.TheoscillatinglasertravelsthroughonesamplealongXaxisandtheotheralongYaxis〔theanglesbetweenthecrystallophysicaxisandthe…  相似文献   

3.
1 Introduction  Recently ,laser performanceofnewYb3 ∶KY (WO4) 2 crystal (Yb3 ∶KYW )hasbeenobtainedat 1 0 2 5nm[1] .TheYb3 ∶KYWcrystalisa promisingmaterialformicrochipand passivemode lockedlaserstunableintherangeof 1 0 2 0~ 1 0 6 0nm .ItisknownthatKerr lensmode lockingtechniq…  相似文献   

4.
1 Introduction  Withincessantappearanceofnewlasercrystalswitheverwiderfluorescencespectrum,suchasTi∶sapphire,Cr4 ∶YAG,theprelimi...  相似文献   

5.
《物理》2000,29(6)
1 Noncquilibrium patternsingranularmixingandsegregation(TroyShinbrot ,FernandoJ.Muzzio .Phys .Today ,2 0 0 0 ,No .3)2 Atmosphericinfrasound (AlfredJ .BedardJr ,ThomasM .Georges.Phys.Today ,2 0 0 0 ,No .3)3 Liquidcrystalsandcarbonmaterials(RobertH .Hurt,Zhong YingChen .Phys.Today ,…  相似文献   

6.
Vol.18 No .1 Mar.2 0 0 1StudyoftheReactionofPd(OAc) 2 withPPh3inCCl4     ………………………WEIFeng ping ,HUANGYong renandFENGLiang boetal.  ( 1 -5)…………ParamagneticgFactorofZnS :Co2 +Crystal      ……………………………………XieLin hua ,HuPingandZhaoMin guang  ( 7-1 1 )……………………………AStudyoftheChainMotio…  相似文献   

7.
1 INTRODUCTIONBecausesomeimportant propertiesofcrystal(suchasspecificheatathightemperature ,melting ,thermalexpansion ,temperaturede  相似文献   

8.
·LASERDEVICES·ExperimentalStudyonActive passiveMode lockingUsingCr4 + ∶YAGasSaturableAbsorber1 61 1AMicrochipTunableBlueLaserSourceBasedUponCr∶LiSAFinContactwithKNCrystal1 61 5HighPower 940nmAl freeActiveRegionLaserDiodesandBarswithaBroadWaveguide1 61 91 .3 2 μmNd3+ ∶Y…  相似文献   

9.
1 Introduction  InrecentyearsLiNbO3crystalshavereceivedmuchattentionbecauseoftheirexcellentnonlinearproperties,andcanbeusedformanyapplicationsinthefieldsofelectro optics,laser physics,holographyandacoustics.Periodically poledcongruentLiNbO3 crystal (PPLN )h…  相似文献   

10.
1 Introduction  Thelasingperformancesofrare earthionTm3 dopedlasercrystalsat~ 2 .3 μmand~1 .9μmwavelength ,correspondingto3H4→3H5 and3F4→ 3H6 transitionswerestudiedbyJ .A .Caird[1] andL .F .Johnson[2 ] .RecentlyF .S .Ermeneux[3] suggestedthelasingpossibilitiesofTm3 dopedlaserc…  相似文献   

11.
1 Introduction  Severalbiaxialcrystals ,suchasKTP ,LBO ,havesomeexcellentproperties,suchaslargenonlinear (NL )coefficients,widewavelengthrangesoftransmission ,andeasilygrowinglargesizecrystalwithhighquality .Thebiaxialcrystalshavebeenextensivelyusedinlaserfr…  相似文献   

12.
1 Introduction  Inphotorefractivecrystal,manyapplications,suchasimageamplificationandimagestorage ,needtousethepropertyofhighdiffractionefficiency .Someauthors[1] havereferredthathighdiffractionefficiencyinphotorefractiveLiNbO3crystalcanbeobtainedbywriting…  相似文献   

13.
本文采用对角化三角场中d5组态完全能量矩阵的方法,研究了KZnF3Fe3+体系的局域晶体结构和EPR参量之间的关系.在分析中我们引入了双层配位模型,即配位体包括Fe3+离子最近邻的6个F-离子和次近邻的8个K+离子.计算表明KZnF3Fe3+的局域结构畸变源于一个K+离子沿C3轴方向(即[111]方向)向Fe3+离子的移动,从而诱导F-离子的位移,使得Fe3+-F-键与C3轴夹角发生变化.通过计算EPR的低对称参量D和(a-F),我们分别得出室温(T=300K)时的畸变角为△θ1=2.58°,△θ2=-1.4°和低温(T7=77 K)时畸变角为△θ1=2.85°,△θ2=-1.40计算结果与实验观察值△θ1=2.8±0.3°,△θ2=-1.1±0.3°相符合.  相似文献   

14.
Polymerliquidcrystals(PLC)withazobenzenemoietiesarepromisingmaterialsforopticalswitchingandimagestoragebecausetheorientationofmesogensinthinfilmsofthismaterialmaybemodifiedbylight.Recently,wefoundthatthereorientationofazobenzenemesogenscanbeachievedbyt…  相似文献   

15.
本文在E_d=0.1—2.5MeV能量范围内,研究了Be~9(d,p_0)Be~(10)(0),Be~9(d,p_1)Be~(10)(3.368MeV),Be~9(d,t_0)Be~8(0),Be~9(d,α_0)Li~7(0)及Be~9(d,α_1)Li~7(0.478MeV)诸反应。在E_d=0.150,0.220,0.401,0.706,1.005,1.301,1.484,1.750,2.000,2.250和2.500MeV共十一个能量上分别测量了这五群出射粒子在θ_L=10—155°区间的角分布。在θ_L=135°,E_d=0.1—2.5MeV,在θ_L=95°,E_d=0.1—2.2MeV,和在θ_L=112.5°,E_d=0.5—2.5MeV测量了Be~9(d,p_0)Be~(10)的激发函数。在θ_L=135°和112.5°,E_d=1.2MeV,用较厚靶(100—300μg/cm~2)测量了Be~9(d,p_0)Be~(10)(0)反应的截面绝对值,结果为σ_p_0(θ_L=135°)=1.60mb/sr,σ_p_0(θ_L=112.5°)=1.55mb/sr。这样就得到了在此能区内,这五群出射粒子的截面情况。对所得结果进行了一些讨论。  相似文献   

16.
Al2O3:Fe3+体系晶格局域结构的EPR理论研究   总被引:3,自引:1,他引:2  
本文通过分析Al2O3∶Fe3+体系中Fe3+离子的EPR谱,研究Fe3+的局域晶体结构结果表明Al2O3∶Fe3+的局域结构存在各向异性膨胀.用拟合EPR谱的低对称参量D和(a-F)实验值的方法,求得两个三棱锥的棱与C3轴的夹角分别为θ1=46.54°和θ2=61.26°,相对于原Al2O3结构的畸变角分别是Δθ1=-1.1°±0.1°,Δθ2=-1.8°.两畸变角同时均小于0说明Al2O3∶Fe3+体系中含Fe3+离子的晶格主要产生沿C3轴的伸长畸变.  相似文献   

17.
《物理》2000,29(10)
1 Phase sensitiveX rayimaging(RichardFitzger ald .Phys .Today ,2 0 0 0 ,No .7)2 AhistoricalperspectiveonCopenhagen (DavidC .Cassidy .Phys .Today ,2 0 0 0 ,No .7)3 TheGermanuranium project(HansA .Bethe .Phys.Today ,2 0 0 0 ,No .7)4 WernerHeisenbergandAlbertEinstein(GeraldHolton .Phys.Toda…  相似文献   

18.
1 Introduction  Therapiddevelopmentofhigh powerdiodelasershasresultedinthesearchformoreefficientsolid statelasermaterialsforvariousapplications.Thelaseremissionfromthe4F3 / 2 4I11/ 2 transitionofNd3 + ionshasbeenobservedinavarietyofNd dopedcrystalsusingflashlam…  相似文献   

19.
1 Introduction  Self frequency doublinglasercrystals,whichcombinetwodifferentfunctionsoflaseremissionandfrequencyconversion ,provideasimplewayofgeneratingcoherentvisibleradiation .Amongthevariousself frequency doublingcrystals ,neodymiumyttriumaluminumbora…  相似文献   

20.
6 电偶极振子的Ec 线图图 2中F(r,π/2 ,t)图线的零点 ,极值点、拐点等反映了什么 ?为说明这些问题我们需先作电偶极振子的Ec 线图 .在 φ =φ0 (定值 )的平面内 ,Ec 线满足的微分方程是drEcr=rdθEcθ将式 ( 4)代入上式 ,消去相同因子 ,得dr2cosθ=rdθsinθ即 drr =2 cosθdθsinθ =d(sin2 θ)sin2 θ解上式得 1rsin2 θ=恒量 ( 1 4′)或 G(r,θ) =1krsin2 θ=K(恒量 )   ( 1 4 )式 ( 1 4 )中k仍为 wc,值得注意Ec 线形状不随时间变化 .用类似于求E线的作图法画出E…  相似文献   

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