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LiNbO3　非線形(NLO)結晶

Lithium Niobate Crystal (LiNbO3)

LiNbO3　非線形(NLO)結晶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.CASTECH can provide high quality and large size LiNbO3 crystals for all of these applications. .

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℃
Curie Temperature: 1140℃
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 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℃
Cruie Temperature: 1140℃
Thermal Conductivity: 38W/m/K@25℃
Thermal Expansion Coefficients(at 25℃): // a, 2.0x10-6/K
// c, 2.2x10-6/K
Resistivity: 2x10-6Ω·cm@200℃
Dielectric Constants: εS11/ε0  =43               εT11/ε0 =78  
εS11/ε0  =28               εT33/ε0  =32  
Piezoelectric Strain Constant: D22=2.04(x10-11C/N)
D33=19.22(x10-11C/N)

The Sellmeier equations(λ in µm):
The Sellmeier equations(λ in µm)

仕様

  • 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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