LiNbO3 変調器用結晶
.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), rc=(ne/no)3r33-r13.
LiNbO3 Q-Switch Specifications
| Size | 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
| Cut Type | SAW Velocity Vs (m/s) |
Electromechanical Coupling Factor k2s (%) |
Temperature Coefficient of Velocity TCV (10-6/oC) |
Temperature Coefficient of Delay TCD (10-6/oC) |
|---|---|---|---|---|
| 127.86o Y-X | 3970 | 5.5 | -60 | 78 |
| Y-X | 3485 | 4.3 | -85 | 95 |
Typical Specifications
| Type Specifications | Boule | Boule | Wafer | Wafer |
|---|---|---|---|---|
| Diameter | Φ3" | Φ4" | Φ3" | Φ4" |
| Length or Thickness(mm) | ≤100 | ≤50 | 0.35-0.5 | 0.35-0.5 |
| Orientation | ※ | ※ | ※ | ※ |
| Ref. Flat Orientation | X,Y | X,Y | X,Y | X,Y |
| Ref. Flat Length | 22±2mm | 32±2mm | 22±2mm | 32±2mm |
| Front Side Polishing | Mirror polished 5-15 Å | Mirror polished 5-15 Å | ||
| Back Side Lapping | 0.3-1.0 µm | 0.3-1.0 µm | ||
| Flatness (mm) | ≤ 15 | ≤ 15 | ||
| Bow (mm) | ≤ 25 | ≤ 25 |
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※127.86°Y, 64°Y, 135°Y, X, Y, Z, and other cut
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