Lithium Niobate Properties

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Lithium Niobate - Properties
LiNbO₃

Wafer Specifications

Fundamental Properties

Item
Melting Point		1253° C
Crystal System		Trigonal
Point Group		3m
Crystal Density		4.647 x 10³ kg / m³
Curie Temperature (Tc)		1133 ± 3°C
Heat Capacity (Cp)		89 J / k.mol
Dielectric Constants	(^T₁₁)	85.2
	(^T₃₃)	28.7
Elastic Constants	(C^E₁₁)	2.03 x 10¹¹ N / m²
	(C^E₁₂)	0.573
	(C^E₁₃)	0.752
	(C^E₁₄)	0.085
	(C^E₃₃)	2.424
	(C^E₄₄)	0.595
Piezoelectric Strain Constants	(e₁₅)	3.7 C / m²
	(e₂₂)	2.5
	(e₃₁)	0.23
	(e₃₃)	1.33

Typical Acoustic Properties

Surface Acoustic Wave Properties

Description	Propagation	Design	Surface Wave Velocity (m/s)	Coupling Coefficient k² (%)	Group Delay Time Temp Coefficient (ppm/°C)	Propagation Loss of SAW (dB/cm)
127.86° Y - Cut	X - Axis	SAW	3980	5.5	75	-
64° Y - Cut	X - Axis	L, SAW	4742	11.3	70	-
41° Y - Cut	X - Axis	L, SAW	4792	17.2	50	-
Y - Cut	Z - Axis	SAW	3488	4.9	94	0.31 (1GHz)
SAW = Surface Acoustic Wave L, SAW =Leaky SAW

Selective Piezoelectric Coupling Factors & Frequency Constants

Plate Orientation	Wave Type	Coupling Factor	Resonance Frequency Constant (MHz-mm)
X	S	0.68	1.838
Z	E	0.17	3.615
36° Y - Cut	QE	0.49	3.300
163° Y - Cut	QS	0.62	1.866
E = extensional S = shear QE = quasi - extensional QS = quasi - shear

Typical Optical Properties

Electro-Optic Coefficients r(10^-12mV^-1) at 632.8 nm

r^T₁₃	10	r^S₁₃	11
r^T₂₂	6.8	r^S₂₂	3.4
r^T₃₃	32.2	r^S₃₃	36.7
r^T₅₁	32	r^S₅₁	18.2

Nonlinear Optical Coefficients at 1-06 μ m (*d₃₁=d₁₅)

d₂₂ / l d₃₆^KDP l	6.5
d₃₁ / l d₃₆^KDP l	-12.3
d₃₃ / l d₃₆^KDP l	-86

Refractive Index at 632.8 nm

n_o	2.2880
n_e	2.2030
n_o: TE mode n_e: TM mode

_{Roditi International 2007}