2020 High quality Nlo Crystals - LiNbO3 / PPLN Crystal – WISOPTIC

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2020 High quality Nlo Crystals - LiNbO3 / PPLN 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.

PPLN: Periodically Polarized Lithium Niobate (PPLN) is a highly efficient wavelength conversion non-linear crystal with wide light transmission range (0.4-4.5 µm) covering the near and mid-infrared regions, long service life, and can be used for frequency doubling, beat frequency, sum frequency, optical parametric oscillation and optical parametric amplification, etc. Temperature control is required during use. The PPLN OPO process can be used to obtain light with wavelength of 3~4.5 µm, which is difficult to be achieved (as high-efficiency output) with conventional phase matching. Different wavelengths of PPLN correspond to different polarization periods.

Contact us for the best solution for your application of LiNbO₃ and PPLN 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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