Lithium niobate is a ferroelectric material with excellent electro-optic, nonlinear optical, and piezoelectric properties. It is one of the most thoroughly characterized electro-optic materials, and Inrad Optics’ crystal growing techniques consistently produce large lithium niobate crystals of exceptional quality. Lithium niobate has a broad transmission range from the visible to the mid-infrared and can be used for a variety of electro-optical and nonlinear optical applications.

Optical modulation and Q-switching. Thanks to its large electro-optic coefficients, lithium niobate is well suited to optical modulation and Q-switching of infrared wavelengths. Among its advantages in these applications are its low half-wave voltage and zero residual birefringence.

Nonlinear optical frequency conversion. Tunable wavelengths can be generated in lithium niobate over a broad range via phasematching processes. Lithium niobate can generate tunable infrared output via difference frequency mixing processes. For second harmonic generation of Nd:YAG lasers at 1.064 µm and low power laser diodes between 1.3 µm and 1.55 µm, lithium niobate is a highly efficient crystal.

Optical Design Notes

  • Consider using magnesium oxide doped lithium niobate (MgO:LiNbO3) for higher power applications. The addition of 5 mol% magnesium oxide (MgO) to lithium niobate produces material with significantly improved optical and photorefractive damage resistance. MgO doped lithium niobate is useful for high power laser applications. Inrad Optics offers MgO:LiNbO3 grown along the crystallographic x, y, or z axes in lengths up to 40 mm.
  • Consult the Inrad Optics white paper on electro-optic behavior for background information on the use of lithium niobate.
Material Properties 
Composition Congruent, 48.38 mol % Li2O
Crystal Symmetry and Class trigonal, R3c Point Group 3m
Lattice Parameters a =  5.15052 Å 
c = 13.86496 Å
Density 4.648  g/cm3
Mohs Hardness 5
Optical Class Uniaxial negative
Transmission Range 0.400 μm - 5.0 μm
Thermal Conductivity  @ 27 °C κ = 4.2 W/m·K
Thermal Expansion αa = 14.1 x 10-6 /K 
αc =  4.1 x 10-6 /K                  
Electro Optic Coefficients
@ 0.633 μm

T: unclamped
S: clamped

r13T = 10  pm/V
r22T = 7 pm/V
r13S =  9 pm/V
r22S =  3 pm/V
r33T = 33 pm/V
r51T =  33  pm/V
r33S = 31 pm/V
r51S = 28   pm/V

Dimensions

Typical apertures range from 3 mm up to 12 mm, but larger apertures are available on request. Available thicknesses range from 0.5 mm to 30 mm.

Finishing

  • Dielectric AR coating
  • Electrodes for Q-switching
  • Ring mounts compatible with standard optomechanics

Orientations

Standard cuts are available for OPO crystals, Q-switch elements, difference frequency mixing crystals and autocorrelation crystals.

Fill out this RFQ form for help in configuring your crystal.

Configuration Options

Designation Angle, θ Operation Input Output
"A" 68.8° DFM (564-600 nm) - 1064 nm  1200-1380 nm 
"B" 59.6° DFM (600-664 nm) - 1064 nm  1370-1770 nm 
SHG 1310 nm  655 nm 
"C" 46.8° DFM (664-923 nm) - 1064 nm  1770-4000 nm 
SHG 1550 nm  775 nm 
"D" 47° DFM 1064 - (1450-2000 nm)  2300-4000 nm 
OPO 1064 nm  1450-4000 nm 
"QS" Z Q-Switch    

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