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/no3γcl, γc=(ne/no)3γ33-γ13.
LiNbO3 Q-Switch Specifications
|Size||9×9×25mm3 or 4×4×15mm3|
|Other size is available upon request|
|Tolerance of size||Z-axis：±0.2mm|
|X-axis and Y-axis：±0.1mm|
|Chamfer||＜0.5mm @ 45°|
|Accuracy of orientation||Z-axis：＜±5′，X-axis and Y-axis：＜±10′|
|Flatness||λ/8 at 633nm|
|AR-coating||R＜0.2% @ 1064nm|
|Electrodes||Gold/Chrome plated on X-faces|
|Wavefront distortion||＜λ/4 @ 633nm|
|Extinction ratio||＞400:1 @ 633nm，Φ6mm 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
Coefficient of Delay
|Length or Thickness (mm)||≤100mm||≤50mm||0.35-0.5mm|
|Orientation||127.86°Y，64°Y，135°Y，X，Y，Z，and other cut|
|Ref. Flat Orientation||X，Y|
|Ref. Flat Length||22±2mm||32±2mm||22±2mm||32±2mm|
|Front Side Polishing||Mirror polished 5-15?|
|Back Side Lapping||0.3-1.0μm|
CASTECH can offer other sizes and specifications of wafers upon request.
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