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  • LiNbO3

  • LiNbO3 Crystal is widely used as frequency doublers for wavelength >1μm and optical parametric oscillators(OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Additionally due to its large Electro-Optic(E-O) and Acousto-Optic(A-O) coefficients, LiNbO3 crystal is the most commonly used material for Pockel Cells, Q-switches and phase modulators, waveguide substrate, and surface acoustic wave(SAW) wafers, etc. CASTECH can provide LiNbO3 crystals with high quality and large size for all these applications.
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                         Structure and Physical Properties of LiNbO3

Crystal Structure

Trigonal, Space group R3c, Point group 3m

Cell parameters

a=5.148 Å , c=13.863 Å

Melting Point

1253℃

Curie Temperature

1140℃

Mohs Hardness

5

Density

4.64g/cm3

Elastic Stiffness Coefficient

CE11 =2.33(×1011N/m2  )

CE33 =2.77(×1011N/m2  )

 

                    Optical and Electro-optical Properties of LiNbO3

Transparency Range

420-5200nm

Optical Homogeneity

5×10-5/cm

Refractive indices at 1064nm

ne = 2.146, no = 2.220 @ 1300 nm

ne = 2.156, no = 2.232 @ 1064 nm

ne = 2.203, no = 2.286 @ 632.8 nm

NLO Coefficients

d33 = 86 x d36 (KDP)

d31 =11.6 x d36 (KDP)

d22 = 5.6 x d36 (KDP)

Electro-optical Coefficients

γT33 = 32 pm/V, γS33 = 31 pm/V

γT31 =10 pm/V, γS31=8.6 pm/V

γT22 = 6.8 pm/V, γS22= 3.4 pm/V

Half-Wave Voltage,DC

Electrical field∥z,light⊥z:

Electrical field∥x or y,light∥z:

 

3.03 KV 

4.02 KV

Damage Threshold

100 MW/cm2 (10 ns, 1064nm)

 

                          Thermal and Electrical Properties of LiNbO3

Melting Point

1250 ℃

Curie Temperature

1140 ℃

Thermal Conductivity Coefficient

38W/m/K @25 ℃

Thermal Expansion Coefficientsat 25℃

//a, 2.0×10-6/K

//c, 2.2×10-6/K

Resistivity

2×10-6 Ω·cm @200 ℃

Dielectric Constant

εS11/ε0  =43               εT11/ε0=78  

εS33/ε0  =28               εT33/ε0= 32 

Piezoelectric Strain Constant

D22=2.04(×10-11C/N )

D33=19.22 (×10-11 C/N  )

 

 

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

 

Specification

  • Transmitting wavefront distortion: < λ/4 @633 nm
  • Dimension tolerance: (W ± 0.1 mm) × (H ± 0.1 mm) × (L ± 0.2mm)
  • Clear aperture:> 90% central area
  • Flatness: λ/8 @633 nm
  • Scratch/Dig code: 20/10 to MIL-PRF-13830B
  • Parallelism: < 20 arc seconds
  • Perpendicularity: 5 arc minutes
  • Angle tolerance: <± 0.5°
  • AR coating: dual wave band AR coating at 1064/532 nm on both surfaces, with R <0.2% at 1064 nm and R <0.5% at 532nm per surface.

*Other coatings are available upon request.

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