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LBO Nonlinear Crystal | CRYLINK
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LBO Nonlinear Crystal | CRYLINK
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LBO is one of the excellent non-linear crystals in the ultraviolet band. It has been successfully used in second and third harmonic generation of YLF, YAG, YAP lasers. LBO crystal has wide transmission band, good ultraviolet transmittance, slightly deliquescence, good physical and chemical properties, moderate non-linear optical coefficient, good optical uniformity, high damage threshold, large allowable angle and small walk-off angle. It has been widely used in high average power second harmonic, sum frequency, difference frequency, third harmonic, fourth harmonic and parametric oscillation field

LBO crystal — the most excellent nonlinear crystal for Noncritical Phase Matched laser frequency doubling

The greatest advantage of LBO is that temperature tuning can be used to achieve non-critical phase matching (NCPM). When the non-critical phase matching relationship is satisfied in the frequency doubling process, the walk-off angle between the fundamental frequency light and the second harmonic of frequency doubling is 0. At this time, the effective length of LBO crystal can theoretically reach infinity, which can compensate for its small non-linear coefficient. Because its damage threshold is very large, it means that high-power fundamental wave pumping can be realized. Therefore, the conversion efficiency of fundamental frequency light will be greatly improved by using the non-critical phase matching of LBO crystal for the extra-cavity frequency doubling of pulsed laser. The beam quality and stability of frequency light will be greatly improved.

Parameter

PropertyValue
Chemical formulaLiB3O5
Crystal structureOrthorhombic, Space group Pna21, Point group mm2
Lattice Parametera=8.4473Å ,b=7.3788Å, c=5.1395Å, Z=2
Mass density2.47 g/cm3
Moh hardness6
Melting pointAbout 834°C
Thermal conductivity3.5W/m/K
BirefringenceNegative biaxial crystal: 2Vz = 109.2˚ at λ = 0.5321μm
Crystal Dimension/mmLength/mmApplication

Orientation Theta/Phi deg

ARCoatings S1/S2,nm/nm

5 x 515THG@1064nm, Type II (e-oe)42.2/901064 + 532 / 355
15SHG@1064nm, Type I (e-oo)90/11.61064 + 532 / 1064 + 532
6 x 60.9SHG@1030nm90/13.8515 + 1030 / 515 + 1030
1.9SHG@1030nm90/13.8515 + 1030 / 515 + 1030
2.8SHG@1030nm90/13.8515 + 1030 / 515 + 1030
3.7SHG@1030nm90/13.8515 + 1030 / 515 + 1030
10 x 100.9SHG@1030nm90/13.8515 + 1030 / 515 + 1030
1.9SHG@1030nm90/13.8515 + 1030 / 515 + 1030
2.8SHG@1030nm90/13.8515 + 1030 / 515 + 1030
3.7SHG@1030nm90/13.8515 + 1030 / 515 + 1030
3 x 310THG@1064nm, Type II   (e-oe)42.2/901064 + 532 / 355
15SHG@1064nm, NCPM I Type90/01064 + 532 / 1064 + 532
15THG@1064nm, Type II (e-oe)42.2/901064 + 532 / 355
15SHG@1064nm, Type I (e-oo)90/11.61064 + 532 / 1064 + 532
20SHG@1064nm, NCPM I Type90/01064 + 532 / 1064 + 532
PropertyValue
Orientation Tolerence< 0.5°
Thickness/Diameter Tolerance±0.05 mm
Surface Flatness<λ/8@632 nm
Wavefront Distortion<λ/4@632 nm
Surface Quality10/5
Parallel30〞
Perpendicular15ˊ
Clear Aperture>90%
Chamfer<0.2×45°
PropertyValue
Transparency Range169 – 2600 nm
Absorption Coefficient:<0.1%/cm at 1064nm;<0.3%/cm at 532nm
Refractive Indices 
at 1.0642 mmnx = 1.5656, ny = 1.5905, nz=1.6055
at 0.5321 mmnx = 1.5785, ny = 1.6065, nz=1.6212
at 0.2660 mmnx = 1.5973, ny = 1.6286, nz=1.6444
Sellmeier Equations(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
PropertyValue
SHG Phase Matchable Range551 ~ 2600nm (Type I);790-2150nm (Type II)
NLO coefficientsdeff(I)=d32cosΦ          (Type I in XY plane)
deff(I)=d31cos2θ+d32sin2θ   (Type I in XZ plane)
deff(II)=d31cosθ         (Type II in YZ plane)
deff(II)=d31cos2θ+d32sin2θ  (Type II in XZ plane)
Non-vanished NLO susceptibilitiesd31=1.05 ± 0.09 pm/V
d32=-0.98 ± 0.09 pm/V
d33= 0.05 ± 0.006 pm/V
Therm-Optic Coefficients(°C,λ in μm)dnx/dT=-9.3X10-6
dny/dT=-13.6X10-6
dnz/dT=(-6.3-2.1λ)X10-6
Angle Acceptance6.54mrad-cm (Φ, Type I,1064 SHG)15.27mrad-cm (q, Type II,1064 SHG)
T [K]αt×106[ K-1],||Xαt×106[K-1 ],||Yαt×106[ K-1],||Z
273107.1-95.433.7
323108.2-8833.6
373108.3-80.933.2
423107.3-74.032.6
473105.3-67.331.7
523102.3-60.730.5
57398.2-54.429.1
67387.0-42.325.5
72379.8-36.523.3
77371.6-30.920.9
87352.1-20.315.3
92340.8-15.312.1
97328.5-10.68.7
102315.1-5.95.0
10730.81.51.1
λ[µm]nXnYnZ
0.25371.63351.65821.6792
0.28941.62091.64671.6681
0.29681.61821.64501.6674
0.31251.60971.64151.6588
0.33411.60431.63461.6509
0.36501.595231.625181.64025
0.40001.589951.61918 
0.40471.59071.62161.6353
0.43581.58591.61481.6297
0.45001.584491.613011.62793
0.48611.58171.60991.6248
0.50001.580591.608621.62348
0.52501.579061.60686 
0.53211.578681.606421.62122
0.54611.57801.60571.6206
0.55001.577721.605351.62014
0.57801.57651.60391.6187
0.58931.57601.60351.6183
0.60001.575411.602761.61753
0.63281.57421.60141.6163
0.65631.57341.60061.6154
0.7000 1.598931.61363
0.80001.569591.596151.61078
0.90001.567641.593861.60843
1.00001.565861.591871.60637
1.06421.564871.590721.60515
1.10001.564321.590051.60449
Interacting wavelengths[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⇒0.4031.70 
0.794⇒0.39732.3 
0.786⇒0.39333 
0.78⇒0.3933.70 
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 86.0
1.3⇒0.65 86.1
1.24⇒0.62 86

Interacting wavelengths[μm] 

T[℃]

along X axis

          SHG, typeⅠ

 

1.547⇒0.7735

117

1.46⇒0.73

50

1.252⇒0.626

3.5

1.25⇒0.625

-2.9

1.215⇒0.6075

21

1.211⇒0.6055

20

1.206⇒0.603

24

1.2⇒0.6

24.3

1.15⇒0.575

61.1

1.135⇒0.5675

77.4

1.11⇒0.555

108.2

1.0796⇒0.5398

112

1.0642⇒0.5321

148/148.5/149/149.5/151

1.047⇒0.5235

166.5/167/172/175/176.5/180

1.025⇒0.5125

190.3

          SFG, typeⅠ

 

1.908+1.0642⇒0.6832

81

1.444+1.08⇒0.6179

23

1.135+1.0642⇒0.5491

112

1.547+0.7735⇒0.5157

141

          DFG, typeⅠ

 

0.532-0.8⇒1.588

135

along Z axis

          SHG, type II

 

1.342⇒0.671

35

1.3⇒0.65

46

Interacting wavelengths[μm]  T[℃]Δφint [deg] Δθint [deg]ΔT[℃]
along X axis     
          SHG, type I    
1.46⇒0.7350  6
1.252⇒0.6263.5  9
1.206⇒0.60324  13
1.135⇒0.567577.4  4.7
1.0642⇒0.53211483.542.573.9
148.5  2.7
1492.31.94
149.5  4.1
1512.12.12.9
1.047⇒0.5235175  3.5
          SFG, type I    
1.908+1.0642⇒0.683281  7.4
1.444+1.08⇒0.6179234.23 
1.135+1.0642⇒0.5491112  5
          DFG, type I    
0.532-0.8⇒1.588135  3.8
Interacting wavelengths[μm]  Φpm[deg]θpm[deg]Δφint[deg]Δθint[deg]ΔT[℃]Δν[cm-1]
XY plane, θ =90(T=293K)      
          SHG, o+o ⇒ e      
1.0796⇒0.539810.7 0.31   
1.0642⇒0.532110.8 0.272.63  
11.4 0.241.79  
11.6   5.8 
  0.342.646.78.8
0.886⇒0.44324.1   7.815.9
0.870⇒0.43525.4 0.12  141
0.78⇒0.3933.7 0.08  194
0.7605⇒0.3802535.9   15.310.5
0.715⇒0.357541 0.06   
          SFG, o+o ⇒ e        
1.0642+0.3547⇒0.266160.7   3.8 
YZ plane, φ =90(T=293K)      
          SHG, o+e ⇒ o      
1.0642⇒0.5321 20.63.20.77  
  30.81 11.5
          SFG, o+e ⇒ o      
1.0641+0.53205⇒0.3547 420.790.166 
1.0642+0.5321⇒0.35473 42.2 0.18  
 413.070.18  
Interacting wavelengths[μm]Φpm[deg]θpm[deg]β[fs/mm]
XY plane, θ =90◦   
           SHG, o+o ⇒ e   
1.2⇒0.62.36 18
1.1⇒0.559.37 37
1.0⇒0.515.74 59
0.9⇒0.4522.94 86
0.8⇒0.431.69 123
0.7⇒0.3543.38 175
0.6⇒0.362.63 257
YZ plane, φ =90◦   
           SHG, o+e ⇒ o   
1.1⇒0.55 15.9882
1.0⇒0.5 28.96106
0.9⇒0.45 45.36139
0.8⇒0.4 76.88186
λ[µm]τp [ns] Ithr [GW/cm2]Note
0.266112>0.04 
0.30817>0.05 
0.000347,000sharp focusing
0.354718>0.1810Hz
8>0.1 
7>0.14 
0.03>9.410Hz
0.015>2.8 
0.018>5 
0.025>610Hz
0.5145CW>0.00003 
0.52350.055>1.1500Hz
0.5321CW>0.0004 
60>0.07900Hz
10>0.22 
0.1>4.5500Hz
0.035>3.1 
0.015>4.4 
0.5920.0005>501kHz
0.6050.0002>25 
0.6160.000431,000sharp focusing
0.6520.02>0.81 
0.7–0.910>0.0310Hz
0.71–0.87251.1–1.425Hz
0.72–0.850.001>8 
0.77–0.830.00005>2280MHz
1.0642CW>0.001 
60>0.061333Hz
18>0.610Hz
9>0.910Hz
8>0.5 
1.319 
1.145bulk damage
0.125 
0.035>4.8 
0.025>3.310Hz
1.07965201–25Hz
0.0430 

for spectral range 0.4–1.0µm and temperature range 293–338K (λ in µm):

dnX/dT=-1.8×10-6K-1

dny/dT=-13.6×10-6K-1

dnz/dT=-(6.3+2.1λ)×10-6K-1

for spectral range 0.4–1.0 µm and temperature range 293–383K (λ in µm):

dnX/dT=-(3.76λ-2.3)×10-6K-1

dny/dT=-(19.40-6.01λ)×10-6K-1

dnz/dT=-(9.70-1.50λ)×10-6K-1

for λ =0.6328µm and temperature range 293–473K (λ in µm, T in K):

dnX/dT=[0.20342-1.9697×10-2 (T-273)-1.4415×10-5(T-273)2]×10-6K-1

dny/dT=-[10.748+7.1034×10-2 (T-273) +5.7387×10-5(T-273)2]×10-6K-1

dnz/dT=-[0.85998+1.5476×10-1 (T-273) -9.4675×10-4(T-273)2+2.2375×10-6(T-273)3]×10-6K-1

Specific Heat Capacity cp  at P =0.101325 MPa
T [K]cp[J/kgK]  
2981060  
Linear Absorption Coefficient α 
λ[µm]α [cm-1]  
0.35–0.360.0031  
1.06420.00035  
Two-photon Absorption Coefficient β
λ[µm]τp[ns]β×1011[cm/W]Note
0.2110.0009103±36θ =90°, Φ=30°
0.2640.000815±5θ =90°, Φ=30°
Nonlinear Refractive Index γ
λ[µm]γ×1015[cm2/W]Note 

0.78

0.26±0.03[100] direction 
0.19±0.03[010] direction 
0.850 .19±0.04  
LBO  Transmission SpectrumSHG tuning curves of LBO Nonlinear Crystal
OPO tuning curves of LBO (TypeI (ooe) in ‘XY’ plane) with different pump light, namely 530 nm, 355 nm and 266 nm
  •  Low sensitivity to moisture
  • Dispertive angle is small
  • High optical homogeneity
  • The range of tunable wavelengths is large
  • The region of transparency is wide
  • Damage threshold is high
  • Wide acceptance angle

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LBO Crystal
LBO Crystal

LBO Crystal
Size: 3×3×10mm
Laser induced damage threshold: >10J/cm2@1064nm,10ns,10HZ
Coating: AR@1064+532nm/355nm

LBO Crystal
Size: 3×3×10mm
Laser induced damage threshold: >10J/cm2@1064nm,10ns,10HZ
Coating: AR@1064+532nm/355nm

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