‌Sapphire EFG Tubes with 2–400mm Outer Diameter Optimized for High-Temperature Optical and Industrial Applications

CrystalTech Ruby CZTS Hollow Rods are precision-manufactured cylindrical components synthesized via Chemical Vapor Transport Deposition (CZTS) technology. Composed of ultra-pure single crystal Al₂O₃ with chromium doping, these rods demonstrate exceptional thermal shock resistance, infrared transparency, and mechanical durability.

Our ruby rods are extensively deployed in laser systems, high-temperature sensors, and semiconductor processing equipment, particularly in ultra-high vacuum (UHV), ionizing radiation, and cryogenic environments where conventional materials like fused silica or yttria-stabilized zirconia exhibit performance limitations.

The CZTS process enables cost-effective production of complex geometries—including rods, tubes, and crucibles—with sub-micron surface finish and strict dimensional control, making them ideal for optical windows, ion implantations, and plasma etching applications.

• Extreme Temperature Stability: Maintains structural integrity from -196°C to 1800°C with minimal thermal expansion (CTE: 5.3*10⁻⁶/°C)
• Superior Hardness: Vickers hardness of 1800 HV, surpassing tungsten carbide in wear resistance
• Broadband Transparency: High transmittance from 200 nm to 5.5 μm (UV–mid-IR range)
• Chemical inertness: Resistant to HF, H₂SO₄, and molten alkali metals
• Customizable Dimensions: OD from 5–500mm, ID from 2–400mm, lengths up to 1200mm

• Laser gain media for solid-state lasers
• High-temperature viewports for plasma reactors
• Semiconductor inspection windows
• Nuclear instrumentation components
• Cryogenic optical systems
• Aerospace sensor protection

Ruby combines the optical clarity of sapphire with chromium-induced fluorescence properties, enabling simultaneous optical transmission and luminescence detection. Unlike polycrystalline alumina, ruby maintains phase purity up to 2000°C and exhibits zero water absorption, making it indispensable for demanding applications requiring simultaneous mechanical strength and optical functionality.

1. What is CZTS Ruby? CZTS (Chemical Vapor Transport Deposition) Ruby is a defect-free single crystal grown through vapor phase transport, offering superior optical quality compared to flame fusion methods.
2. What are the advantages of CZTS-grown ruby rods? They provide exceptional homogeneity, low birefringence, and the ability to produce large-diameter rods with minimal internal stress.
3. Can CrystalTech produce custom-shaped ruby components? Yes. We offer custom machining of rods, tubes, and plates with precision boreholes, threading, and surface treatments.
4. What industries benefit most from ruby components? Ruby is critical for aerospace optics, semiconductor metrology, medical lasers, and nuclear instrumentation due to its unique combination of properties.