.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
Coupling Factor k2s
Coefficient of
Velocity TCV
Coefficient of
Delay TCD
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
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
  • 127.86°Y, 64°Y, 135°Y, X, Y, Z, and other cut




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