Magnesium oxide doped lithium niobate (MgO:LiNbO3)

Material

Magnesium Oxide doped Lithium Niobate (MgO:LiNbO3) has a combination of excellent electro-optical and nonlinear optical properties (transparency in the spectral range of 0.4µm - 5µm, high nonlinear optical coefficient and resistance to laser radiation) with simultaneous mechanical and chemical stability.

It has similar effective nonlinear coefficients, optical and physical properties as pure LiNbO3.

 

The destruction threshold of MgO:LiNbO3 is much higher than that of pure LiNbO3 single crystals (>200MW/cm2@1064nm, 10ns for pure LiNbO3 and >300MW/cm2 @1064nm, 12ns for MgO:LiNbO3) because the doping of the single crystals with MgO in the range of 4mol% to 7mol% suppresses the photorefractive destruction. MgO:LiNbO3 features non-critical phase matching (NCPM) at room temperature and can achieve the angular tuning SHG of Nd:YAG and Nd:YLF lasers. MgO:LiNbO3 is widely used for electro-optic modulators (EOM Q-switches), high power frequency doublers (SHG), mixers (SFG), optical parametric oscillators (OPO) and amplifiers (OPA), and integrated wave guides.


Properties
Optical and spectral properties
Transmission range
320 ‐ 5600
Refractive index @1300 nm
ne=2,146

no=2,220

Reflection losses in % at 1 surface @ 633 nm
14,6
optical homogeneity in 1/cm
5·10-5
NLO coefficients in pm/V
d33= 34,40

d31=d15= 5,95

d22= 3,07

Damage threshold in MW/cm2 (10ns)
300
Absorption loss in %/cm @1064 nm
< 0,1
Physical properties
Density in g/cm3
4,64
Melting point in °C
1253
Specific heat capacity in J/(kg · K)
628
Thermal conductivity in W/(m · K) @25°C
4,19 (⊥ c-axis)

4,6 (∥ c-axis)

Thermal expansion in 1/K @25°C
14,8 · 10-6 (⊥ c-axis)

4,1 · 10-6 (∥ c-axis)

Dielectric constant @298K, 100kH
82
Solubility in water in g/100g
insoluble
Mohs hardness
5
Knoop hardness in kg/mm²
630
Material type
single crystalline, synthetic
Crystal structure
hexagonal
Lattice constants in Å
a = 5,15

c = 13,86

Elastic coefficient in GPa
C11 = 202

C12 = 55

C13 = 71

C14 = 8,3

C33 = 242

C44 = 60,1

Young's Modulus (E) in Gpa
170
Shear Modulus (G) in GPa
68
Bulk Modulus (K) in GPa
112
Poisson's ratio
0,25
Spectral properties
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