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  • LiNbO3

  • 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.
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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)3γ3313.

 

 

LiNbO3 Q-Switch Specifications

Size 9×9×25mmor 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′
Parallelism <20″
Finish 10/5
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

 

Cut Type SAW
Velocity
νs (m/s)

Electromechanical
Coupling Factor

κ2s (%)

Temperature
Coefficient of Velocity

TCV (10-6/℃)

Temperature
Coefficient of Delay
TCD (10-6/℃)
127.86° Y-X 3970 5.5 -60 78
Y-X 3485 4.3 -85 95

 

 

Typical Specifications

 

Type

Specifications

Boule Wafer
Diameter Φ3″ Φ4″ Φ3″ Φ4″
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 5-15Å
Back Side Lapping   0.3-1.0μm
Flatness(μm)   ≤15
Bow(μm)   ≤25

CASTECH can offer other sizes and specifications of wafers upon request.

 

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