LiNbO3
When an electric field (E) is applied to an electro-optic (E-O) crystal, the refractive index of E-O crystal will change linearly to electric field. The phenomenon is called linear electro-optic effect. For KD*P crystal, for example, the change of the refractive index (Dn) is Dn = 0.5no3r63E if both the directions of light propagation and electric field are along the z-axis, where no is refractive index without electric field and r63 is electro-optic coefficient of KD*P.There are two kinds of E-O modulations. One is longitudinal E-O modulation if the directions of electric field and light propagation are the same. The KDP isomorphic crystals are normally used in this scheme. If the directions of electric field and light propagation are perpendicular, it is called transverse E-O modulation. The LiNbO3, MgO:LiNbO3, ZnO:LiNbO3, BBO and KTP crystals are usually employed in this scheme.
Physical and Optical Properties
Physical and Optical Properties
Crystal Structure: ............................................................Trigonal, space group R 3cTransparency Range: .........................................................................420 - 5200 nm
Cell Parameters: .................................................................a = 0.515Å, c = 13.863Å
Melting Point: .......................................................................................1255 +/-5°C
Curie point: ...........................................................................................1140 +/-5°C
Optical Homogeneity: ...................................................................Δn ≈ 5 x 10 -5 /cm
Mohs Hardness: .......................................................................................................5
Density: ....................................................................................................4.64 g/cm3
Thermal Conductivity: ................................................................38 W /m /K @ 25°C
Absorption Coefficient: ............................................................<0.1%/cm @ 1064 nm
NLO coefficients: ................d33 = 34.4pm/V d31 = d15 = 5.95pm/V d22 = 3.07pm/V
Damage Threshold at 1.064 mm: ..........................................................200 MW/cm2
Refractive Indices:...............................................ne = 2.146, no = 2.220 @ 1300 nm
...............................................ne = 2.156, no = 2.322 @ 1064 nm
..............................................ne = 2.203, no = 2.286 @ 632.8 nm
Typical Specification and Capabilities
Angle tolerance: .................................................................Δθ< ± 0.5°; Δφ< ±0.5°
Dimension tolerance: ................(W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)
Flatness: ...........................................................................................< λ/8 @ 633nm
Scratch/Dig code: ...........................better than 10/5 Scracth/dig per MIL-O-13830A
Parallelism: ....................................................................................< 20 arc seconds
Perpendicularity: ...............................................................................< 5 arc minutes
Wavefront distortion: ........................................................................< λ/8 @ 633nm
Clear aperture: ...........................................................................> 90% central area
Aperture: ....................................................................................................1~50 mm
Length: ....................................................................................................0.3~20 mm
Phase matching type: ......................................................................Type I or Type II
End configuration: .............................................Flat, spherical, parallel and wedged
Typical Coating: .......................................................................Antireflective Coating
