LiNbO3&MgO:LiNbO3

Lithium Niobate (LiNbO3) is widely used as electro-optic modulator and Q-switch for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulator for fiber optics, etc. The transverse modulation is mostly employed for LiNbO3 crystal.

Also LiNbO3 Crystal is widely used as frequency doublers for wavelength >1um and optical parametric oscillators (OPO) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices.

Properties

Large Electro-Optic (E-O) coefficients

Large Acousto-Optic (A-O) coefficients

Applications

Frequency doublers

Optical parametric oscillators (OPO)

Quasi-phase-matched (QPM) device

Q-switches and modulator

Properties

Crystal Structure

Trigonal, space group R3c

Cell Parameters

a = 0.515Å, c = 13.863Å, Z = 6Å

Melting Point

1255±5^oC

Curie Point

1140±5^oC

Mohs Hardness

5

Density

4.64g/cm³

Absorption Coefficient

~ 0.1%/cm @ 1064 nm

Solubility

insoluble in water

Relative Dielectric Constant

e^T₁₁/e₀: 85, e^T₃₃/e₀: 29.5

Thermal Expansion Coefficients( @ 25^oC)

||a, 2.0 x 10^-6/K, ||c, 2.2 x 10^-6/K

Thermal Conductivity

38 W /m /K @ 25^oC

Transparency Range

420-5200 nm

Optical Homogeneity

~5 x 10^-5 /cm

Sellmeier Equations( λ in um)

n_o² = 4.9048+0.11768/(λ² - 0.04750) - 0.027169λ²
n_e² = 4.5820+0.099169/(λ²- 0.04443) - 0.021950λ²

NLO Coefficients

d₃₃ = 34.4 pm/V
d₃₁ = d₁₅ = 5.95 pm/V
d₂₂ = 3.07 pm/V

Electro-Optic Coefficients

g^T₃₃ = 32 pm/V, g^S₃₃ = 31 pm/V
g^T₃₁ = 10 pm/V, g^S₃₁ = 8.6 pm/V
g^T₂₂ = 6.8 pm/V, g^S₂₂ = 3.4 pm/V

Half-Wave Voltage, DC

Electrical field ||z, light ⊥ z 3.03 KV
Electrical field ||x or y, light || z 4.02 KV

Efficiency NLO Coefficients

d_eff=5.7pm/V or~14.6xd₃₆(KDP) for frequency doubling 1300 nm;
d_eff=5.3pm/V or~13.6xd₃₆(KDP) for OPO pumped at 1300nm;
d_eff=17.6pm/V or~45xd₃₆(KDP) for quasi-phase-matched structure;

Damage Threshold

200 MW/cm²

DELN can provide LiNbO3 products used for many applications, such as E-O modulator, waveguide substrate, frequency doubling, SAW wafer application etc.

Specifications

Dimension Tolerance	±0.1mm
Angle Tolerance	±0.5°
Surface Flatness	<λ/8@633nm
Wavefront Distortion	<λ/4@633nm
Parallelism	<20 arc seconds
Perpendicularity	<5 arc minutes
Surface Quality	20/10 Scratch and Dig
Clear Aperture	>95%
Coating	AR coating Upon customer’s request

Magnesium Oxide Doped Lithium Niobate Crystal

Compared with LiNbO3 crystal, MgO:LiNbO3 crystal exhibits its particular advantages for NCPM frequency doubling (SHG) of Nd:Lasers, mixing (SFG) and optical parametric oscillators (OPOs). MgO:LiNbO3 is also a good crystal for optical parametric oscillators (OPOs) and amplifiers (OPAs), quasi-phase-matched doublers and integrated waveguide.

MgO:LiNbO3 has similar effective nonlinear coefficients to pure LiNbO3, Its Sellmeier equations (for MgO dopant 7 mol%) are:

no2=4.8762+0.11554/(λ2 - 0.04674) - 0.033119λ2

ne2=4.5469+0.094779/(λ2 - 0.04439) - 0.026721λ2

Lithium Tantalate Crystal

LiTaO3 crystal is also widely used as electro-optic modulator, with NLO and E-O properties similar to those of LiNbO3 but higher damage threshold (>500 MW/cm for ns pulsed).

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Crystal Structure	Trigonal, space group R3c
Cell Parameters	a = 0.515Å, c = 13.863Å, Z = 6Å
Melting Point	1255±5^oC
Curie Point	1140±5^oC
Mohs Hardness	5
Density	4.64g/cm³
Absorption Coefficient	~ 0.1%/cm @ 1064 nm
Solubility	insoluble in water
Relative Dielectric Constant	e^T₁₁/e₀: 85, e^T₃₃/e₀: 29.5
Thermal Expansion Coefficients( @ 25^oC)	\|\|a, 2.0 x 10^-6/K, \|\|c, 2.2 x 10^-6/K
Thermal Conductivity	38 W /m /K @ 25^oC
Transparency Range	420-5200 nm
Optical Homogeneity	~5 x 10^-5 /cm
Sellmeier Equations( λ in um)	n_o² = 4.9048+0.11768/(λ² - 0.04750) - 0.027169λ² n_e² = 4.5820+0.099169/(λ²- 0.04443) - 0.021950λ²
NLO Coefficients	d₃₃ = 34.4 pm/V d₃₁ = d₁₅ = 5.95 pm/V d₂₂ = 3.07 pm/V
Electro-Optic Coefficients	g^T₃₃ = 32 pm/V, g^S₃₃ = 31 pm/V g^T₃₁ = 10 pm/V, g^S₃₁ = 8.6 pm/V g^T₂₂ = 6.8 pm/V, g^S₂₂ = 3.4 pm/V
Half-Wave Voltage, DC	Electrical field \|\|z, light ⊥ z 3.03 KV Electrical field \|\|x or y, light \|\| z 4.02 KV
Efficiency NLO Coefficients	d_eff=5.7pm/V or~14.6xd₃₆(KDP) for frequency doubling 1300 nm; d_eff=5.3pm/V or~13.6xd₃₆(KDP) for OPO pumped at 1300nm; d_eff=17.6pm/V or~45xd₃₆(KDP) for quasi-phase-matched structure;
Damage Threshold	200 MW/cm²