LiNbO3 & MgO:LiNbO3

LiNbO3 Crystal

LiNbO3 crystals are widely used as frequency doubling for wavelengths 1m and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to their large

LiNbO3 crystals

LiNbO3 crystals are widely used as frequency doubling for wavelengths 1m and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to their large

LiNbO3 crystals Details:

LiNbO3 crystals are widely used as frequency doubling for wavelengths >1μm and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to their large Electro-Optic(E-O) and Acousto-Optic (A-O) coefficients.
LiNbO3 crystals are the most commonly used material for pockel cells, Q-switches and phase modulators, waveguide substrates, surface acoustic wave (SAW) wafers, etc.LiNbO3 crystals are widely used as frequency doubling for wavelengths >1μm and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to their large Electro-Optic(E-O) and Acousto-Optic (A-O) coefficients.
LiNbO3 crystals are the most commonly used material for pockel cells, Q-switches and phase modulators, waveguide substrates, surface acoustic wave (SAW) wafers, etc.

Physical and Optical Properties

Crystal StructureTrigonal, space group R3c
Cell Parametersa=0.515,c=13.863,Z=6
Melting Point1255 +/-5℃
Curie Point1140 +/-5℃
Mohs Hardness5
Density4.64 g/cm 3
Absorption Coefficient~ 0.1%/cm @ 1064 nm
Solubility:insoluble in H2O
Relative Dielectric ConstantεT11/ε0: 85
εT33/ε0:29.5
Thermal Expansion Coefficients at 25℃||a, 2.0 x 10 -6/K @ 25℃
||c, 2.2 x 10 -6/K @ 25℃
Thermal Conductivity38 W /m /K @ 25℃
Transparency Range420 – 5200 nm
Refractive Indicesn e = 2.146, n o = 2.220 @ 1300 nm
n e = 2.156, n o = 2.322 @ 1064 nm
n e = 2.203, n o = 2.286 @ 632.8 m
Optical Homogeneity~ 5 x 10 -5 /cm
Sellmeier Equations( l in m m)n o 2 (l ) = 4.9048+0.11768/(l2- 0.04750) – 0.027169l2
n e 2 ( l) = 4.5820+0.099169/( l2 – 0.04443) – 0.021950 l2
Crystal StructureTrigonal, space group R3c
Cell Parametersa=0.515,c=13.863,Z=6
Melting Point1255 +/-5℃
Curie Point1140 +/-5℃
Mohs Hardness5
Density4.64 g/cm 3
Absorption Coefficient~ 0.1%/cm @ 1064 nm
Solubility:insoluble in H2O
Relative Dielectric ConstantεT11/ε0: 85
εT33/ε0:29.5
Thermal Expansion Coefficients at 25℃||a, 2.0 x 10 -6/K @ 25℃
||c, 2.2 x 10 -6/K @ 25℃
Thermal Conductivity38 W /m /K @ 25℃

 

Transparency Range420 – 5200 nm
Refractive Indicesn e = 2.146, n o = 2.220 @ 1300 nm
n e = 2.156, n o = 2.322 @ 1064 nm
n e = 2.203, n o = 2.286 @ 632.8 m
Optical Homogeneity~ 5 x 10 -5 /cm
Sellmeier Equations( l in m m)n o 2 (l ) = 4.9048+0.11768/(l2- 0.04750) – 0.027169l2
n e 2 ( l) = 4.5820+0.099169/( l2 – 0.04443) – 0.021950 l2

Some applications of pure LN crystal are limited by its relative low optical damage threshold. While when doped with 5mol% magnesium oxide, MgO:LN crystal shows 1-2 orders of magnitude increase in optical damage threshold, coercive field for domain reversal also decreases from 21KV/mm to 6KV/mm below, UV-absorption edge position shifts to 310nm and OH-infrared absorption peak to 3535cm-1,which greatly develops the application of LN crystal.

We can provide MgO:LN crystal wafers, crystal blocks and bars with various specifications. Crystal defects and distributions of refractive index are strictly examined.

Applications: Quasi-phase Matching for SHG and OPO

Orientation

Z-cut±0.2°

Diameter

76.2mm±0.3mm

Orientation Flat(OF)

22mm±2mm

Perpendicular to X±0.2°(⊥)

Second Refer Flat(RF)

10mm±3mm

Cw270°±0.5°from OF

Cw315°±0.5°from OF

Thickness

50μm±5μm

1000μm±5μm

Surface

Double sides polished

S/D 20/10

TTV

≤6μm

WARP

≤20μm

Concentration

4.9-6mol%

Refraction Index

No=2.2827±0.0003

Ne=2.1928±0.0003

Prism coupler method @632.8nm, Doped 5mol%

Edge Beveling

Edge rounding

Pure congruent lithium niobate biggest drawback is that laser damage threshold is very low, which limits its applications. When mixed with 5mol% MgO after the grown MgO: LN crystal laser damage threshold increased 1-2 orders of magnitude, from 21KV/mm poling voltage drops 6KV/mm, violet absorption edge moved 310mm, OH-absorption peak red shifted to 3535cm -1, these changes greatly expanded the scope of application of the LN crystal.