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ANHUI CRYSTRO CRYSTAL MATERIALS Co., Ltd.
ANHUI CRYSTRO CRYSTAL MATERIALS CO., LTD.
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Fiber Optical Isolators Piezoelectric Effect Crystals Lithium Niobate - LiNbO3

ANHUI CRYSTRO CRYSTAL MATERIALS Co., Ltd.
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Fiber Optical Isolators Piezoelectric Effect Crystals Lithium Niobate - LiNbO3

Brand Name : Crystro
Place of Origin : China
MOQ : 1pc
Price : USD 20~200/pc
Payment Terms : T/T, Western Union, MoneyGram, Paypal
Supply Ability : 2000pcs per month
Delivery Time : 4-5 weeks
Packaging Details : Transparent clean box
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Lithium Niobate - LiNbO3 Crystal Material

LiNbO3 crystal combines low cost, good mechanical and physical properties as well as high optical homogeneity. Therefore, LiNbO3 wedges have been widely used in fiber isolators and circulators.


Crystro provides:

  • LiNbO3 wedges used for fiber optical isolators and circulators.
  • Reliable delivery
  • Strict quality control
  • Technical support
  • Very competitive prices

Basic Properties of LiNbO3

Crystal StuructureTrigonal, Space group R3c, Point group 3m
Melting Point1253℃
Mohs Hardness5
Density4.64g/cm3
DeliquescenceNone
Optical Homogeneity~5x10-5/cm
Transparency Range420-5200nm
Absorption Coefficient~0.1%/cm @1064nm
Refractive Indices at 1064nmne=2.146, no=2.220@1300nm ne=2.156, no=2.232@1064nm ne=2.203, no=2.286@632.8nm
Thermal Expansion Coefficients (at 25℃ )//a,2.0x10-6/K //a,2.2x10-6/K
Thermal Conductivity Coefficients38 W/m/K at 25℃
Thermal Optical Coefficientsdno/dT=-0.874 x 10-6/K at 1.4μm dne/dT=39.073 x 10-6/K at 1.4μm
The Sellmeier Equations (λ in μm)no2=4.9048+0.11768/(λ2-0.04750)-0.027169λ2 ne2=4.5820+0.099169/(λ2-0.04443)-0.02195λ2

Specifications of LiNbO3 wedges

Aperture1.0 x1.0 mm2 to 4 x 4 mm2
Dimension Tolerance±0.05mm
Wedge Angle Tolerance±0.1°
Optical Axis Orientation±0.5°
Flatnessλ/4 @632.8nm
Surface Quality20-10
AR-CoatingR<0.2% @1550nm±40nm
Standard Size1.25mmx1.25mmx0.5mm with 13º or 15º wedge, phi=22.5º

Note: Other sizes and coatings are available upon request.


LiNbO3 is also widely used as electro-optic modulators and O-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. The electro-optic coefficients of LiNbO3 are: r33= 32 pm/V, r31= 10 pm/V, r22= 6.8 pm/V at at low frequency and r33= 31 pm/V, r31= 8.6 pm/V, r22= 3.4 pm/V at high electric frequency. The halfwave voltage: Vπ=λd/no3γc1, γc=(ne/no)3γ3313.


LiNbO3 Q-switch Specifications

Size9 X 9 X25 mm3 or 4 X 4 X 15 mm3
Other size is available upon request
Tolerance of SizeZ-axis: ± 0.2mm
X-axis and Y-axis: ± 0.1mm
Chanferless than 0.5 mm at
Accuracy of OrientationZ-axis: < ±5′,X-axis and Y-axis: < ±10′
Parallelism<20′′
Finish10/5 scratch/dig
Flatnessλ/8 at 633nm
AR-CoatingR<0.2% @1064nm
ElectrodesGold/Chrome plated on X-faces
Wavefront Distortion<λ/4 @633nm
Extinction Ratio>400:1 @633nm, φ 6mm beam

LiNbO3 is also a good acousto-optic crystal and used for surface acoustic wave (SAW) wafer and A-O modulators. Crystro provides acoustic (SAW) grade LiNbO3 crystals in wafers, as-cut boules, finished components and custom fabricated elements.


Typical SAW Properties

Cut TypeSAW Velocity Vs (m/s)Electromechanical Coupling Factor K2s(%)Temperature Coefficient of Velocity TCV (10-6/℃)Temperature Coefficient of Delay TCD (10-6/℃)
127.86 ° Y-X39705.5-6078
Y-X34854.3-8595

Typical Specifications

SpecificationsBouleWafer
DiameterΦ3''Φ4''Φ3''Φ4''
Length or Thickness (mm)≤100≤500.35-0.5
Orientation127.86°Y,64°Y,135°Y,X,Y,Z, and other cut
Ref.Flat OrientationX,Y
Ref.Flat Length22±2mm32±2mm22±2mm32±2mm
Front Side polishing/Mirror polished 5-15 Å
Back Side Lapping/0.3-1.0μm
Flatness (μm)/≤15
Bow (μm)/≤25

Crystro can offer other size and specification of wafers upon request.



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