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LBO

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LBO

LiB3O5 (Lithium Triborate) crystal is one of the most excellent nonlinear optical crystals found so far that can be used for non-critical phase matching laser frequency doubling, it has good nonlinear optical properties and stable physical and chemical properties, which is especially important because its dispersion amount is sensitive to temperature changes, and it can achieve non-critical phase matching during the frequency doubling process, due to its large damage threshold, which means that it can achieve High-power fundamental pumping and also longer
optical crystals can be used, which are undoubtedly useful for obtaining high-power frequency doubling lasers. At 1.064 μm light, the effective SHG coefficient of the LBO crystal is three times higher than that of the KDP. the optical damage threshold of the LBO is the highest among the commonly used inorganic nonlinear optical crystals. Therefore, it is one of the best choices for high power second harmonic generators and other nonlinear optical applications.

FEATURES

  • High optical uniformity
  • Wide transparent area
  • Wide tunable wavelength range
  • low sensitivity to moisture
  • Wide receiving angle, small discrete angle
  • Spectral Noncritical Phase Matching (NCPM) close to 1300nm
  • Class I, II Non-Critical Phase Matching (NCPM) Wide Band Range
  • High damage threshold (1053nm laser with pulse width of 1.3ns can reach 10GW/cm2)
  • High frequency doubling conversion efficiency (equivalent to 3 times that of KDP crystal)

Physical and Chemical Properties

AttributeNumerical
Chemical FormulaLiB3O5
Crystal StructureRhombic, Space GroupPna21,Point Group mm2
Lattice Constanta=8.4473Å ,b=7.3788Å, c=5.1395Å, Z=2
Mass Density2.47 g/cm3
Mohs Hardness6
Melting PointAbout 834°C
Thermal Conductivity3.5W/m/K
BirefringenceNegative Biaxial Crystal:λ=0.5321μm,2Vz =109.2˚

Nonlinear Optical Properties

AttributeNumerical
SHG Phase Matching Range551 ~ 2600nm (Type I);790-2150nm (Type II)
NLO Coefficientdeff(I)=d32cosΦ(Type I in the XY Plane)
deff(I)=d31cos2θ+d32sin2θ(Type I in the XZ Plane)
deff(II)=d31cosθ(Type II in the YZ Plane)
deff(II)=d31cos2θ+d32sin2θ(Type II in the XZ Plane)
NLO Sensitivity Does not Disappeard31=1.05 ± 0.09 pm/V
d32=-0.98 ± 0.09 pm/V
d33= 0.05 ± 0.006 pm/V
Thermal-optical Coefficient(°C<,<λinμm)dnx/dT=-9.3X10-6
dny/dT=-13.6X10-6
dnz/dT=(-6.3-2.1λ)X10-6
Angle to Accept6.54mrad-cm(Φ,I型,1064 SHG)15.27mrad-cm(q,II型,1064 SHG)

Linear Optical Properties

AttributeNumerical
Transparent Range169 – 2600 nm
Absorption Coefficient <0.1%/cm @1064nm;<0.3%/cm @532nm
Refractive Index, #colspan#
At 1.0642 mmnx= 1.5656,
ny= 1.5905,
nz= 1.6055
At 0.5321 mmn= 1.5785,
n= 1.6065,
nz = 1.6212
At 0.2660 mmnx = 1.5973,
ny = 1.6286,
nz = 1.6444
Sellmeier Equation(λ in μm)nx2=2.454140+0.011249/(λ2-0.011350)-0.014591λ2-6.60×10-5λ4
ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.0×10-4λ4
nz2=2.586179+0.013099/(λ2>-0.011893)-0.017968λ2-2.26×10-4λ4

Phase Matching Angle Experimental Value (T=293K)

Interaction Wavelength[μm]Φexp [deg]θexp [deg]
XY Plane θ= 90°  
          SHG, o+o ⇒ e
1.908⇒0.95423.8 
1.5⇒0.757 
1.0796⇒0.539810.6/10.7 
1.0642⇒0.532111.3/11.4/11.6/11.8 
0.946⇒0.47319.4/19.5 
0.930⇒0.46521.3 
0.896⇒0.44823.25 
0.88⇒0.4424.53 
0.850⇒0.42527 
0.84⇒0.4227.92 
0.836⇒0.41828.3 
0.80⇒0.4031.7 
0.794⇒0.39732.3 
0.786⇒0.39333 
0.78⇒0.3933.7 
0.7735⇒0.3867534.4 
0.75⇒0.37537.13/37 
0.746⇒0.37337.5 
0.7094⇒0.354741.8/41.9/42/43.5 
0.63⇒0.31555.6 
0.555⇒0.277586 
0.554⇒0.27790 
          SFG, o+o ⇒ e
1.3414+0.6707⇒0.4471320 
1.0642+0.5321⇒0.3547337/37.1/37.2 
1.053+0.5265⇒0.35138.2 
1.0642+0.35473⇒0.2660560.7/61 
0.86+0.43⇒0.286761 
1.3188+0.26605⇒0.2213970.2 
0.21284+2.35524⇒0.195250.3 
0.21284+1.90007⇒0.191463.8 
0.21284+1.58910⇒0.1877488 
YZ Plane, Φ=90◦  
          SHG, o+e ⇒ o
1.908⇒0.954 46.2
1.5⇒0.75 14.7
1.0796⇒0.5398 19.2
1.0642⇒0.5321 19.9/20.5/20.6/21.0
          SFG, o+e⇒ o
1.0641+0.53205⇒0.3547 42/42.7
1.0642+0.5321⇒0.35473 42.2/42.5/43.2
XZ Plane, Φ=0◦, θ<VZ  
          SHG, e+o ⇒ e
1.3414⇒0.6707 3.6/4.2/5.0
1.3188⇒0.6594 5.2
1.3⇒0.65 5.4
XZ Plane, Φ=0◦, θ>VZ  
          SHG, e+e ⇒ o
1.3414⇒0.6707 86.1/86.3/86.6
1.3188⇒0.6594 86
1.3⇒0.65 86.1
1.24⇒0.62 86

Experimental Values ​​of Non-critical Phase Matching (NCPM) Temperature

Interaction Wavelength[μm]T[℃]
Along the X-Axis       SHG, typeⅠ 
1.547⇒0.7735117
1.46⇒0.7350
1.252⇒0.6263.5
1.25⇒0.625-2.9
1.215⇒0.607521
1.211⇒0.605520
1.206⇒0.60324
1.2⇒0.624.3
1.15⇒0.57561.1
1.135⇒0.567577.4
1.11⇒0.555108.2
1.0796⇒0.5398112
1.0642⇒0.5321148/148.5/149/149.5/151
1.047⇒0.523166.5/167/172/175/176.5/180
1.025⇒0.5125190.3
          SFG, typeⅠ 
1.908+1.0642⇒0.683281
1.444+1.08⇒0.617923
1.135+1.0642⇒0.5491112
1.547+0.7735⇒0.5157141
          DFG, typeⅠ 
0.532-0.8⇒1.588135
Along the Z Axis         SHG, type II 
1.342⇒0.67135
1.3⇒0.6546

Spectrum

LBO nonlinear crystal OPO NanjingGuangbao CRYLINKLBO nonlinear crystal SHG NanjingGuangbao CRYLINK
LBO nonlinear crystal transmission NanjingGuangbao CRYLINK

References

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[2] Reinvestigation on the phase transition of a LiB3O5 crystal near its melting point[J]. Journal of Crystal Growth, 2016, 435:1-5.
[3]  A Y J ,  A C L J ,  A L W , et al. The optical properties of planar waveguides in LiB3O5 crystals formed by Cu+ implantation – ScienceDirect[J]. Applied Surface Science, 2006, 253( 5):2674-2677.
[4]  Yang L ,  Yue Y ,  Mao Q , et al. Growth and nonlinear optical properties of Zn-doped LiB3O5 crystals[J]. Optical Materials, 2015, 43:6-9.
[5]  Kananen B E ,  Mcclory J W ,  Giles N C , et al. Copper-doped lithium triborate (LiB3O5) crystals: A photoluminescence, thermoluminescence, and electron paramagnetic resonance study[J]. Journal of Luminescence, 2017:S0022231317309109.
[6]  Shepelev Y F ,  Bubnova R S ,  Filatov S K , et al. LiB3O5 crystal structure at 20, 227 and 377°C[J]. Journal of Solid State Chemistry, 2005, 178(10):2987-2997.
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[8]  Surovtsev N V ,  Malinovsky V K ,  Solntsev V P , et al. Peculiarities of LiB3O5 crystallization from melts studied by Raman spectroscopy[J]. Journal of Crystal Growth, 2008, 310(15):3540-3544.
[9]  Ogorodnikov I N ,  Kruzhalov A V ,  Porotnikov A V , et al. Dynamics of electronic excitations and localized states in LiB3O5[J]. Journal of Luminescence, 1998, 76-77(2):464-466.
[10]  I. N , Ogorodnikov, and, et al. Sub-nanosecond time-resolved spectroscopy of LiB3O5 under synchrotron radiation[J]. Journal of Luminescence, 1997.
[11]  Depci T ,  Oezbayoglu G ,  Yilmaz A , et al. The thermoluminescent properties of lithium triborate (LiB3O5) activated by aluminium[J]. Nuclear Inst & Methods in Physics Research B, 2008, 266(5):755-762.
[12]  Neumair S C ,  Vanicek S ,  Kaindl R , et al. High-pressure synthesis and crystal structure of the lithium borate HP-LiB3O5[J]. Journal of Solid State Chemistry, 2011, 42(52):no-no.
[13]  Kannan C ,  Kimura H ,  Miyazaki A , et al. Nucleation, growth and characterization of LiBO single crystals[J]. Journal of Crystal Growth, 2005, 275(1–2):e769-e774.
[14]  Lim A R ,  Yoon C S . Structural nature of 7Li and 11B sites in the nonlinear optical material LiB3O5 using static NMR and MAS NMR[J]. Materials Chemistry & Physics, 2014, 147(3):644-648.
[15]  Li H Q ,  Zhang H B ,  Bao Z , et al. High-power nanosecond optical parametric oscillator based on a long LiB3O5 crystal[J]. Optics Communications, 2004, 232(1-6):411-415.
[16]  Kannan C ,  Ganesamoorthy S ,  Rajesh D , et al. Anisotropic properties of self-flux grown LiB 3O 5 single crystals[J]. Solid State Communications, 2005, 136(4):215-219.
[17]  Ogorodnikov I N ,  Isaenko L I ,  Kruzhalov A V , et al. Thermally stimulated luminescence and lattice defects in crystals of alkali metal borate LiB3O5 (LBO)[J]. Radiation Measurements, 2001, 33(5):577-581.
[18]  Sabharwal S C ,  Tiwari B , Sangeeta. Investigations on the growth of LiB 3 O 5 crystal by top-seeded solution growth technique[J]. Journal of Crystal Growth, 2004, 263(1/4):327-331.
[19]  Sabharwal S C ,  Tiwari B , Sangeeta. Effect of highest temperature invoked on the crystallization of LiB 3O 5 from boron-rich solution[J]. Journal of Crystal Growth, 2003, 249(3):502-506.
[20]  Almeida A ,  Thomazini D ,  Vasconcelos I F , et al. Structural studies of lithium triborate (LBO–LiB3O5) in borophosphate glass-ceramics[J]. International Journal of Inorganic Materials, 2001, 3(7):829-838.

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