Grown under pressure. Finished to the micron.
STWIR Hong Kong Limited supplies single-crystal HPHT diamond substrates, anvils and optics, together with CVD heat spreaders, detectors and brazed assemblies, to laboratories and OEMs on four continents. Stock formats leave within days. Everything else is quoted from your drawing.
A material that does not negotiate.
Diamond is the stiffest, hardest and most thermally conductive solid that can be made in a factory. It is transparent from the deep ultraviolet to the far infrared, chemically indifferent to almost everything, and it shrugs off radiation doses that turn silicon into noise. The only difficulty is making it in the shape, orientation and purity a device actually needs. That is the part we do.
We grow single crystals by high-pressure high-temperature synthesis, grow polycrystalline and homoepitaxial layers by microwave-plasma CVD, and finish both with the same orientation, laser-cutting, polishing and inspection chain.
Technology and material dataSeven product families. One finishing line.
Whether the starting point is an HPHT crystal or a CVD wafer, every part passes through the same orientation, cutting, polishing and inspection stations and leaves with the same passport.
HPHT for the crystal. CVD for the area.
High pressure, high temperature
A carbon source, a metal solvent and a seed are held at several gigapascals and well above 1 300 °C until carbon crystallises on the seed as a single cuboctahedron. The result is a thick, low-dislocation crystal with the optical homogeneity that anvils, windows and high-end substrates require.
Microwave-plasma CVD
In a hydrogen-methane plasma excited at 2.45 GHz, carbon condenses atom by atom onto a heated substrate. On an HPHT seed the layer is single-crystal; on silicon or molybdenum it is polycrystalline and can be grown across a 50 mm wafer. This is the route for large windows, heat spreaders, thin membranes and detector plates.
From crystal to component in five stations.
Every part, regardless of growth route, passes through the same sequence. Inspection sits between the stations, not at the end.
Orientation
Each crystal or wafer is oriented by X-ray Laue diffraction before anything is cut, so the finished plate presents the plane you asked for, not the one that was convenient.
Water-jet-guided laser cutting
A laser coupled into a fine water jet slices plates, discs, anvils and multi-sector shapes with no heat-affected zone and with kerf losses small enough to make 15 × 15 mm substrates economic.
Lapping and polishing
Plates are lapped flat and then polished to Ra ≤ 5 nm on single crystal and ≤ 10 nm on polycrystalline material, one face or both, with wedge angles held where interference fringes must be suppressed.
Metallisation and joining
Sputtered Ti/Pt/Au, Ti/Ni/Au or Cr/Au stacks, lithographic patterning, and vacuum brazing to metal carriers for parts that must be soldered, biased or sealed.
Inspection and passport
Dimensions, flatness, roughness, orientation and, where relevant, optical and electrical figures are measured on every part and recorded in a material passport that travels with the shipment.
Six places where only diamond holds.
Our customers rarely choose diamond for its reputation. They choose it because the previous material failed in exactly that position.
High-pressure research
Anvils, seats and backing plates for diamond anvil cells, matched in pairs and selected for low fluorescence.
- Static high-pressure cells
- Raman and X-ray diffraction under pressure
- Geoscience and planetary materials
Lasers and photonics
Windows, output couplers, lenses and prisms that neither heat up nor distort under kilowatts of optical load.
- High-power CO₂ and fibre lasers
- Gyrotron and RF windows
- Long-wave infrared imaging, 8 – 14 µm
- Raman converters and disc lasers
Thermal management
Heat spreaders and submounts under GaN, laser diodes and RF transistors, where the junction temperature caps the output.
- Laser diode and VCSEL mounts
- RF and microwave power modules
- High-density power electronics
Synchrotrons and accelerators
Beam position monitors, fluorescent screens, instrumented windows and stripper foils for beamlines that destroy everything else.
- X-ray beam position and flux monitors
- Vacuum windows and filters
- Heavy-ion stripper foils
Quantum and electronics
Plates with measured nitrogen and boron for NV-centre sensing, radiation-hard electronics and power-device research.
- NV magnetometry and ODMR
- Boron-doped electrodes
- Wide-band-gap device substrates
Tooling and wear parts
Oriented blanks for dressers, indenters, turning tools and dies, where the hardest plane has to meet the work.
- Dressing and truing tools
- Indenters and styli
- Drawing dies and nozzles
How an order runs.
You send the problem
A drawing, a target specification, or just a description of what the part has to survive. Stock plates can be ordered directly by size and orientation.
We answer with a specification
Within one business day you receive a manufacturable specification, the tolerance we will hold in production, a lead time and a price. If a cheaper grade will do the job, we say so.
The part ships with its passport
Stock formats dispatch within ten working days. Custom parts take four to ten weeks. Every consignment carries a material passport, a certificate of conformance and the dimensional record.
Every part leaves with its passport.
A diamond component is small, expensive and often irreplaceable within a project deadline. We therefore measure every single part rather than a sample, record the figures against its serial number, and keep the record so that a question two years later still has an answer.
Quality and documentation- 100 % dimensional and surface inspection on every part
- Material passport with measured, not nominal, values
- Serial-number traceability from growth run to shipment
- End-use screening and export documentation handled before dispatch
Send the drawing.
We reply with a specification, a lead time and a price within one business day, in English, German, French or Chinese.