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LiNbO3 Crystal
LN Crystal¡ª has a lot super performance, such as ,Piezoelectric Strain, electro-optic,voice-optic ,nonlinear and so on.Due to its large Electro-Optic (E-O) and Acousto-Optic (A-O) coefficients, LiNbO3 crystal is the most commonly used material for Pockel Cells, Q-switches and phase modulators, waveguide substrate, and surface acoustic wave (SAW) wafers, etc.
LN cystal is an most imporant and versatile one. It is of nonlinear¡¯s properties,and the nonlinear¡¯s coefficient is very large.Further more, it can enhance their performance through some special way.Mixing the Mg, then the LN systal ¡®slaser damage threshold will be improved largely,as a result, it promote the use of LN crystal in in nonlinear fields. Nd:Mg:LN crystal,it can achieve the domino offect of self -frequency;Mixing the Fe,then the LN cystal will performace better in light storage in Electron-optic application. LN crystal is a super material for light-wave transmit. Aslo,LN crystal is a goodPiezoelectric Stain one, it can be used in high _low frequency SAW filter or large power change machine.
1, Basic Properties
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Crystal structure |
3m£¬a=b=5.148Å,c=13.863Å |
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Methods of growth |
(CZ) |
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Melting Point |
1250¡æ |
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Density |
4.64g/cm2 |
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Curie Point |
1142¡À1¡æ |
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Mohs Hardness |
5 |
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Thermal Expansion Coefficient |
a11=15.4¡Á10-6/K a33=7.5¡Á10-6/K |
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Refractive Indexes |
n0=2.286 ne=2.203 @632.8nm |
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Refractive Indexes Grade |
£¨633nm£©¡Ü5¡Á10-5/cm |
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NonlinearCoefficients (pmV-1) |
d31=11.6
d33=86
d22=5.6 |
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Electro-optic Coefficients pm/V |
r33=30.8
r31=8.6
r22=3.4
r51=28 |
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Transparency rate |
370¡«5000nm
¡Ý68%@633 nm |
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Crystal Structure |
Trigonal, point group 3m |
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Lattice Parameters |
a=5.148Å, c=13.863Å |
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Density |
4.64 g/cm3 |
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Melting Point |
1250 ¡ãC |
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Curie Point |
1142¡À1¡æ |
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Mohs Hardness |
5 |
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Dielectric Constant |
e11/e0 = 85; e33/e0 = 29.5 |
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Thermal Conductivity |
38 W/m/¡ãC at 25¡ãC |
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Thermal Expansion Coefficient |
a1=a2 =2x10-6/¡ãC, a3=2.2x10-6/ ¡ãC at 25¡ãC |
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Piezoelectric Strain Constant |
d22 = 2.04 x 10-11 C/N, d33 = 19.22 x 10-11 C/N |
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Elastic Stiffness Constant |
CE11 = 2.04 x 1011 N/m2, CE33 = 2.46 x 1011 N/m2 |
Optical and NLO Properties
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Transparency Region |
3700 ~ 5000 nm |
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Sellmeier Equations (l in mm) |
no2 = 4.9048+0.11768/(l2-0.0475)-0.027169l2
ne2 = 4.5820+0.099169/(l2-0.04443)-0.02195l2 |
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Optical Homogeneity |
Dn ~ 5x105/cm2 |
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Nonlinear Coefficients |
deff=13.6 d36(KDP) for OPO at 1064 nm
deff =14.6 d36(KDP) for SHG at 1300 nm
deff =45.0 d36(KDP) for QPM |
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Refractive Indexes |
none
2.2202.146@ 1300 nm
2.3222.156@ 1064 nm
2.2862.203@ 632.8 nm |
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Electro-optic Coefficients (pm/V) |
Low frequencyHigh frequency
g333231
g31108.6
g226.83.4 |
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Damage Threshold |
> 250 KW/cm2 at 1064 nm (10 ns) |
2. Linear Optical Properties
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Transparency Range
420-5200nm |
LiNbO3 Transparency Curve
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Refractive Indices
ne=2.146, no = 2.220 @ 1300 nm
ne= 2.156, no = 2.232 @ 1064 nm
ne= 2.203, no = 2.286 @ 632.8nm |
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Optical Homogeneity ~ 5 x 10-5 /cm |
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Sellmeier Equations (l in mm):
n2o (l) = 4.9048+0.11768/(l2 - 0.04750) - 0.027169l2
n2e (l) = 4.5820+0.099169/(l2 - 0.04443) - 0.021950l2 |
3. Nonlinear Optical Properties
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NLO Coefficients |
d33 = 34.4 pm/V
d31 = d15 = 5.95 pm/V
d22 = 3.07 pm/V |
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Efficiency NLO Coefficients |
deff =5.7 pm/V or ~14.6 x d36 (KDP) for frequency doubling 1300 nm;
deff =5.3 pm/V or ~13.6 x d36 (KDP) for OPO pumped at 1064 nm;
deff =17.6 pm/V or ~45 x d36 (KDP) for quasi-phase-matched structure. |
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Electro-Optic Coefficients |
gT33 = 32 pm/V, gS33 = 31 pm/V,
gT31=10 pm/V, gS31=8.6 pm/V,
gT22 = 6.8 pm/V, gS22=3.4 pm/V, |
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Half-Wave Voltage, DC
Electrical field||z, light ^z:
Electrical field||x or y, light||z: |
3.03 KV
4.02 KV |
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Damage Threshold |
100 MW/cm2 (10 ns, 1064nm) |
4. (1) Standard Specifications of laser grade LiNbO3 crystals:
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Transmitted wavefront distortion |
better than l/4 @ 633nm |
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Dimension tolerance |
(W¡À0.1mm) x (H¡À0.1mm) x (L¡À0.2mm) |
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Clear aperture |
over 90% central diameter |
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Flatness |
l/8 @ 633nm |
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Surface quality |
20 /10 Scratch/Dig |
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Parallelism |
better than 20 arc sec |
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Perpendicularity |
5 arc min |
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Angle tolerance |
Dq < 0.5o, Df < 0.5o |
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AR-coating |
Per your requirements |
LiNbO3 typical orientations:
► q¹0¡ã, f=-90¡ã,For SHG@1064nm Type I, fundamental wavelength range: 1.078¡ª3.5mm.
The following parameters are typically required to specify when ordering:
► Sizes► Width x Height x Length (mm)
► Phase matching angleq and f► Coating on S1&S2
► Protective coating or reflectivity @ wavelength
(2):
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Dimension tolerance |
¡À0.1mm |
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Thickness tolerance |
¡À0.01mm |
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Clear aperture |
over 90% central diameter |
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Surface flatness |
10-15mm |
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Surface quality |
Ra<10Å |
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Bow |
<20mm for f<60mm |
LiNbO3 wafer typical orientations:
X, Y, Z, 127.86¡ãY, 64¡ãY, 135¡ãY, 41¡ãY
LiNbO3 wafer typical diameter and thickness
f25.4mm, f50.8mm, f76.2mm,T=0.2~1.0mm
The following parameters are typically required to specify when ordering:
► Sizes►Diameter, thickness
► Orientation►Normal to surface
► Surface finishOne surface or double / surfaces polished Note: Other specifications of LN crystals and coatings are available upon your request
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