Description of Rutile Titanium Dioxide Crystal Substrate
The monocrystalline substrate made from rutile titanium dioxide (TiO₂) exhibits significant birefringence and a high refractive index. It is employed as a material for spectral prisms and polarising devices (e.g. optical isolators and beam splitters). When compared with YVO₄, the TiO₂ crystals show enhanced physical and chemical stability.
Specifications of Rutile Titanium Dioxide Crystal Substrate
Key Performance Parameters
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Crystal Structure
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Tetragonal System
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Lattice Constant
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a = 4.5936 Å c = 2.9582 Å
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Growth Method
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Flame Method, Floating Zone Method
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Density
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4.26 (g/cm³)
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Melting Point
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1870°C
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Heat Capacity
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0.17 (25°C)
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Transmission
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0.5 – 4.5 μm
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Refractive Index
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no = 2.47, ne = 2.73 at λ = 1.3 μm
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Thermo-Optic Coefficient
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dη/dT: a = -0.72 × 10⁻⁶/K, c = -0.42 × 10⁻⁶/K
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Linear Expansion Coefficient
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a = 7.14 × 10⁻⁶/K, c = 9.19 × 10⁻⁶/K
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Hardness
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7 (Mohs)
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Crystal Rod
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Φ25 mm × 90 mm
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Orientation
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<001>, <110>, <100>, <111>
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Standard Dimensions
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5 × 5 × 10 mm, 5 × 10 × 10 mm, 10 × 10 × 0.5 mm, Diameter 20 mm × 0.5 mm
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Polishing
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Single-sided or double-sided polished
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Tolerances and Optical Quality
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Dimension tolerance: +0.1 mm, Alignment tolerance: ±0.5°
Parallelism: <30′′, Flatness: <λ/4, Perpendicularity: <30′′,
Surface quality: 10/5
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Applications of Rutile Titanium Dioxide Crystal Substrate
- Spectral Prism
- Polarising Device (e.g. optical isolators and beam splitters)