Special Design for Crystals For Shg - LiNbO3 Crystal – WISOPTIC

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Special Design for Crystals For Shg - LiNbO3 Crystal – WISOPTIC Detail:

LiNbO₃(Lithium Niobate) crystal is a multifunctional material that integrates properties of piezoelectric, ferroelectric, pyroelectric, nonlinear, electro-optical, photoelastic, etc. LiNbO₃ has good thermal stability and chemical stability.

As one of the most thoroughly characterized nonlinear optical materials, LiNbO₃ is suitable for a variety of frequency conversion applications. For example, it is widely used as frequency doublers for wavelength >1 μm and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to its large E-O and A-O coefficients, LiNbO₃ crystal is also commonly used for phase modulators, waveguide substrate, surface acoustic wave wafers, and Q-switching of Nd:YAG, Nd:YLF and Ti-Sapphire lasers.

LiNbO₃can be doped with a variety of elements, such as Er, Pr, Mg, Fe, etc., which give the material unique properties. For example, the damage threshold of MgO: LiNbO₃is more than double that of pure LiNbO₃.

Contact us for the best solution for your application of LiNbO₃ crystals.

WISOPTIC Capabilities -LiNbO₃

• Various sizes of finished components for different applications.

• Strict quality control

• Reliable delivery

• Very competitive price

• Technical support

WISOPTIC Standard Specifications^* - LiNbO₃

Dimension Tolerance	± 0.1 mm
Angle Tolerance	± 0.5°
Flatness	< λ/8 @ 632.8 nm
Surface Quality	< 20/10 [S/D]
Parallelism	< 20”
Perpendicularity	≤ 5′
Chamfer	≤ 0.2mm @ 45°
Transmitted Wavefront Distortion	< λ/4 @ 632.8 nm
Clear Aperture	> 90% central area
Coating	AR coating: R < 0.2% @ 1064 nm, R < 0.5% @ 532 nm
* Products with special requirement upon request.

LN-2
LN-3

DOWNLOAD Technical Data – LiNbO3

Advantages of MgO:LiNbO₃ compared with LiNbO₃

• Higher frequency doubling (SHG) efficiency for pulsed Nd:YAG (65%) and CW Nd:YAG (45%)

• Higher performance in applications of OPO, OPA, QPM doublers and integrated waveguide

• Much higher photorefractive damage threshold

Primary Applications – LiNbO₃

• Frequency doublers for wavelength >1 μm

• Optical parametric oscillators (OPO) pumped at 1064 nm

• Quasi-phase-matched (QPM) devices

• Q-switches (for Nd:YAG, Nd:YLF and Ti-Sapphire lasers )

• Phase modulators, waveguide substrate, surface acoustic wave wafers

Physical Properties – LiNbO₃

Chemical formula	LiNbO₃
Crystal structure	Trigonal
Point group	3m
Space group	R3c
Lattice constants	a=5.148 Å, c=13.863 Å, Z = 6
Density	4.628 g/cm³
Melting point	1255 °C
Curie temperature	1140 °C
Mohs hardness	5
Thermal conductivity	38 W/(m·K) @ 25°C
Thermal expansion coefficients	2.0×10^-6/K (//a), 2.2×10^-6/K (//c)
Hygroscopicity	Non-hygroscopic

Optical Properties – LiNbO₃

Transparency region (at “0” transmittance level)	400-5500 nm
Refractive indices	1300 nm	1064 nm		632.8 nm
	n_e=2.146 n_o=2.220	n_e=2.156 n_o=2.232		n_e=2.203 n_o=2.286
Thermal optic coefficients	dn_o/dT=-0.874×10^-6/K @ 1.4 μm dn_e/dT=39.073×10^-6/K @ 1.4 μm
Linear absorption coefficients	326 nm		1064 nm
	α = 2.0 /cm		α = 0.001~0.004 /cm
NLO coefficients	d₃₃ = 34.4 pm/V, d₂₂ = 3.07 pm/V, d₃₁ = d₁₅ = 5.95 pm/V
Electro-optic coefficients	γ^T₃₃=32 pm/V, γ^S₃₃=31 pm/V, γ^T₃₁=10 pm/V, γ^S₃₁=8.6 pm/V, γ^T₂₂=6.8 pm/V, γ^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
Damage threshold	100 MW/cm² @ 1064nm, 10 ns

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