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LiNbO3 Crystal
LiNbO3 is widely used as electro-optic modulators and Q-switches for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulators for fiber optics. The following table list the specifications of a typical LiNbO3 crystal used as Q-switch with transverse E-O modulation. The light propagates in z-axis and electric field applies to x-axis. The electro-optic coefficients of LiNbO3 are: r33 = 32 pm/V, r31 = 10 pm/V, r22 = 6.8 pm/V at low frequency and r33 = 31 pm/V, r31= 8.6 pm/V, r22 = 3.4 pm/V at high electric frequency. The half–wave voltage: Vπ=λd/(2no3r22L), r c=(ne/no)3r33-r13.
LiNbO3 Q-Switch Specifications
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Size
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9 X 9 X 25 mm3 or 4 X 4 X 15 mm3 |
| Other size is available upon request |
| Tolerance of size |
Z-axis: ± 0.2 mm |
| X-axis and Y-axis:±0.1 mm |
| Chamfer |
less than 0.5 mm at 45° |
| Accuracy of orientation |
Z-axis: <± 5’
X-axis and Y-axis: < ± 10’ |
| Parallelism |
< 20" |
| Finish |
10/5 scratch/dig |
| Flatness |
λ/8 at 633 nm |
| AR-coating |
R < 0.2% @ 1064 nm |
| Electrodes |
Gold/Chrome plated on X-faces |
| Wavefront distortion |
<λ/4 @ 633 nm |
| Extinction ratio |
> 400:1 @ 633 nm, φ6 mm beam |
LiNbO3 is also a good acousto-optic crystal and used for surface acoustic wave (SAW) wafer and A-O modulators. CASTECH provides acoustic (SAW) grade LiNbO3 crystals in wafers, as-cut boules, finished components and custom fabricated elements.
Typical SAW Properties
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Cut Type
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SAW Velocity
Vs (m/s)
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Electromechanical Coupling Factor
k2s (%)
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Temperature Coefficient of Velocity
TCV (10-6/oC)
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Temperature Coefficient of Delay
TCD (10-6/oC)
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127.86o Y-X
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3970
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5.5
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-60
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78
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Y-X
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3485
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4.3
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-85
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95
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Typical Specifications
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Type Specifications
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Boule
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Wafer
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Diameter
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Φ3"
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Φ4"
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Φ3"
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Φ4"
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Length or Thickness(mm)
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≤100
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≤50
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0.35-0.5
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Orientation
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127.86°Y, 64°Y, 135°Y, X, Y, Z, and other cut
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Ref. Flat Orientation
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X, Y
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Ref. Flat Length
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22±2mm
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32±2mm
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22±2mm
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32±2mm
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Front Side Polishing
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Mirror polished 5-15 Å
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Back Side Lapping
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0.3-1.0 mm
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Flatness (mm)
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≤ 15
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Bow (mm)
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≤ 25
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CASTECH can offer other sizes and specifications of wafers upon request.
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LiNbO3 产品详情介绍