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Fe: LiNbO3 (Iron doped Lithium Niobate)

Fe:LiNbO3 is one of the most useful photorefractive materials with its high photo-refractive sensitivity, high diffraction efficiency, large electro-optic (EO) coefficients and excellent physical-chemical stabilities. Therefore it has a wide application in holographic storage, optical memories and information processing. Newlight Photonics supplies Fe:LiNbO3 grown from congruent melt with the Fe doping from 0.005 to 0.10 mol%.

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 deg C
Curie Temperature	1140 deg C
Mohs Hardness	5
Density:	4.64 g/cm3
Deliquescence	None
Refractive indices	ne = 2.20, no = 2.29 @ 632.8 nm
Thermal Expansion Coefficient (@ 25oC)	//a, 2.0x10-6/K
Thermal Expansion Coefficient (@ 25oC)	//c, 16.7x10-6/K
Thermal Conductivity Coefficient:	38 W/m/K at 250 oC
Thermal Optical Coefficient	dno/dT=-0.874x10-6/K at 1.4µm dne/dT=39.073x10-6/K at 1.4µm
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
Surface Damage Threshold	300 MW/cm2 (10 ns, 1064nm)

Specifications on finished products

Dopant tolerance: +/-0.01 mol %

Diameter tolerance: +/-0.1mm

Scratch/Dig: 20/10 per MIL-O-1380A

Parallelism: < 30 arc seconds

Surface flatness: ~< λ/4 at 632.8nm

Clear aperture: Central 95%

Coating: R< 0.2% for AR@532nm. AR at other wavelengths are available upon request.