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Crystal
LiNbO3
details

LiNbO3 Crystal is widely used as frequency doublers for wavelength > 1μm and optical parametric oscillators (OPOs) pumped at 1064 nm and quasi-phase-matched (QPM) devices. Additionally due to its large Electro-Optic(E-O) and Acousto-Optic(A-O) coefficients, LiNbO3 is the most commonly used material for Pockel Cells, Q-switches and phase nodulators, waveguide substrate,and surface acoustic wave (SAW) wafers, etc. 

Structural and Physical Properties of LiNbO3

  Crystal Structure:

  Trigonal, Space group R3C, Point group 3m

  Cell Parameters:

  a=5.148Å , c=13.863 Å

  Melting Point:

  1253°C

  Curie Temperature:

  1140°C

  Mohs Hardness:

  5

  Density:

  4.64 g/cm3

  Elastic Stiffness Coefficients

  CE11= 2.33(×1011N/m2  )

  CE33= 2.77(×1011N/m2  )


Optical and Electro-optical Properties of LiNbO3

  Transparency Range:

  420-5200nm

  Optical Homogeneity:

  ~ 5 x 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)

  Effective NLO Coefficients:

  deff(I)=d31sinθ-d22cossin3Φ
  deff(II)=d22cos2θcos3Φ

  Electro-Optic Coefficients

  rT33 = 32 pm/V,   rS33 = 31 pm/V,
  rT31 =10 pm/V,     rS31=8.6 pm/V,
  rT22 = 6.8 pm/V,   rS22= 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 LiNbO


  Melting Point:

  1250°C

  Cruie Temperature:

  1140°C

  Thermal Conductivity:

  38W/m/K@25°C

  Thermal Expansion Coefficients(at 25°C):

  // a, 2.0x10-6/K

  // c, 2.2x10-6/K

  Resistivity:

  2x10-6Ω·cm@200°C

  Dielectric Constants:

  εS110­  =43               εT110­ =78  

  εS110­  =28               εT330­  =32  

  Piezoelectric Strain Constant:

  D22=2.04(x10-11C/N)

  D33=19.22(x10-11C/N)


The Sellmeier equations(λ in μm):



Specifications

● Transmitting wavefront distortion: less than λ/4 @ 633 nm
● Dimension tolerance: (W ± 0.1 mm) x (H ± 0.1 mm) x (L ± 0.2mm)
● Clear aperture: > 90% central area
● Flatness: λ/8 @ 633 nm
● Scratch/Dig code: 20/10 to MIL-PRF-13830B
● Parallelism: better than 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 532 nm per surface. Other coatings are available upon request.



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