LiTaO3_CASTECH INC.

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LiTaO3
LiTaO3 is an E-O crystal widely used for E-O devices, due to its good optical NLO and E-O properties, as well as high damage threshold. CASTECH supplies high quality LiTaO3 boules and wafers.

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Introduction

LiTaO₃ is an E-O crystal widely used for E-O devices, due to its good optical NLO and E-O properties, as well as high damage threshold. CASTECH supplies high quality LiTaO₃ boules and wafers with the following specifications for standard applications. We can also offer other specifications upon request.

Basic Properties of LiTaO₃：

Crystal Structure	Trigonal, Space group R3c, Point group 3m
Cell Parameters	a=5.154Å，c=13.781Å
Melting Point	1650℃
Curie Temperature	607℃
Mohs Hardness	5.5
Density	7.46g/cm³
Dielectric Constants	ε₁₁/ε₀：51.7 ε₃₃/ε₀：44.5
Elastic Stiffness Coefficients	C^E₁₁：2.33（×10¹¹N/m²） C^E₃₃：2.77（×10¹¹N/m²）
Piezoelectric Strain Constants	d₂₂：2.4（×10^-¹¹C/N） d₃₃：0.8（×10^-¹¹C/N）
Transmission range	400-4500nm
Electro-optical coefficients	r₃₃=30.4pm/V
Refractive index at 632.8nm	n_o=2.176，n_e=2.180

Typical Specifications：

Type Specifications	Boule		Wafer
Diameter	Φ3″		Φ3″	Φ4″
Length or Thickness	≤100mm	≤50mm	0.35-0.5mm
Orientation	127.86°Y，64°Y，135°Y，X，Y，Z，and other cut
Ref. Flat Orientation	X，Y
Ref. Flat Length	22±2mm	2mm	22±2mm	32±2mm
Front Side Polishing			Mirror polished 5-15Å
Back Side Lapping			0.3-1.0μm
Flatness（μm）			≤15
Bow（μm）			≤25