Quick answer: AR Coating Fused Silica covers Fused Silica (CTE 0.55 x 10^-6 /K, 185 nm – 2.5 um); R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um). Prototypes ship in 5-10 working days.
ar coating fused silica is anti-reflective multilayer applied by ion-assisted e-beam deposition. On Fused Silica it raises transmission from ~92% to above 99% – the specification we run to is R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um).
Specifications at a glance
| Material | Fused Silica (JGS1 (UV), JGS2 (standard), JGS3 (IR)) |
|---|---|
| Thermal expansion (CTE) | 0.55 x 10^-6 /K |
| Service temperature | 1,100 C continuous |
| Transmission range | 185 nm – 2.5 um |
| Density | 2.20 g/cm3 |
| Knoop hardness | 500 kg/mm2 |
| Refractive index | 1.458 @ 587 nm |
| Stock thickness | 0.10 – 50 mm |
| Maximum blank size | 450 x 450 mm |
| Treatment | AR Coating – anti-reflective multilayer |
| Specification | R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um) |
| Deposition / method | ion-assisted e-beam deposition |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
What the process holds
Beyond this page, Fused Silica routinely runs through dicing, ultrasonic machining, drilling, edge grinding in our shop – most real parts combine two or three of these steps.
Specification advice
Before sending the RFQ, check these against your drawing:
- Material note: its hardness and brittleness demand diamond tooling and controlled feeds.
- Sequence matters: all machining happens before ar coating; post-coating rework is not economical.
- Over-specification is the quiet budget killer: a 20/10 scratch-dig face costs roughly three times an 80/50 face, so grade each surface individually.
For the complete framework, see the tolerance design guide and the holes and edges design guide.
Application context
Orders for ar coating fused silica cluster in microfluidic devices (chips, manifolds, via plates, bonded stacks); machine vision (camera windows, ring-light diffusers, calibration plates); aerospace optics (sensor windows, star-tracker flats, radiation-tolerant ports). Background reading on the underlying material science: RP Photonics: fused silica.
The fastest route to a quote is geometry: use the 3D builder below, draw a dimensioned 2D drawing from it, or open the site-wide custom glass machining 3D + 2D builder for fully custom parts.
Related reading on this site: tolerance design guide, laser glass cutting, alkali-free glass wafers.
Frequently asked questions
How does Fused Silica behave under heat?
CTE is 0.55 x 10^-6 /K and continuous service reaches 1,100 C continuous, which is what drives its use where near-zero thermal expansion matters.
What does ar coating add?
Raises transmission from ~92% to above 99%. Applied by ion-assisted e-beam deposition to R < 0.5% per face, 400 – 700 nm (custom bands 193 nm – 2 um).
Is there a minimum order for ar coating fused silica?
No. Single prototypes are accepted, and pricing steps down at 10, 100 and 1,000 pieces.
How fast can prototypes ship?
Machined prototypes ship in 5 – 10 working days. Coated or bonded parts add 1 – 2 weeks depending on queue slots.
What files do you need for a quote?
A dimensioned PDF plus DXF or STEP geometry. If only a sketch exists, our drawing review service formalizes it before quoting.
Specifications on this page were last reviewed by our engineering team in August 2026.