Quartz (SiO2)
rystalline form of silica with excellent thermal stability
Crystalline Silica
Optical Quartz is the crystalline form of silicon dioxide and offers excellent thermal stability, low internal stress, and predictable optical behaviour. Unlike fused silica, quartz exhibits birefringence, making it suitable for resonators, frequency-control devices, and specialised optical components. It is commonly used in precision instrumentation and scientific applications.
Is this material right for your application?
Use When:
Avoid When:
Consider Alternatives:
Crystalline optical behaviour is required
Birefringence is acceptable or desired
Thermal stability and frequency control are important
Resonators or precision optical components are used
Long-term dimensional stability is required
Birefringence is undesirable
Isotropic optical behaviour is required
Lower-cost amorphous alternatives are acceptable
Fused Silica – isotropic behaviour and easier fabrication
Calcite – stronger birefringence for polarisation optics
Sapphire – improved mechanical robustness
Key Properties
Optical
Birefringent crystalline structure
Good UV transmission
Mechanical
High dimensional stability
Low internal stress
Thermal / Environmental
Excellent thermal stability
Predictable frequency behaviour
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Frequently asked questions about Barium Fluoride specifications and use-cases
FAQ
Q1. What wavelength range is Sapphire suitable for?
Sapphire transmits from ~150 nm to ~5.5 µm.
Q2. Is Sapphire mechanically strong?
Yes. Extremely hard and abrasion-resistant.
Q3. Is Sapphire suitable for harsh environments?
Yes. Performs well under high pressure and temperature.
Q4. What are alternatives to Sapphire?
Fused Silica and CaF₂.
High cost compared to glass
Difficult to machine
Excellent chemical resistance