Dichroic Coating Fused Silica – Fused Silica (CTE 0.55 x 10^-6 /K, 185 nm – 2.5 um); cut-on/cut-off slopes < 2% of edge wavelength. No minimum order; DFM review included with every RFQ.
dichroic coating fused silica is thin-film interference stack applied by ion-beam sputtering, 40 – 120 layers. On Fused Silica it wavelength-selective reflection and transmission – the specification we run to is cut-on/cut-off slopes < 2% of edge wavelength.
Key parameters
| 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 | Dichroic Coating – thin-film interference stack |
| Specification | cut-on/cut-off slopes < 2% of edge wavelength |
| Deposition / method | ion-beam sputtering, 40 – 120 layers |
| RFQ inputs | PDF/DXF/STEP drawing, quantity brackets, surface and edge spec |
Design guidance
Three items decide most of the cost and lead time on this work:
- Material note: its hardness and brittleness demand diamond tooling and controlled feeds.
- Sequence matters: all machining happens before dichroic 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.
The full rules live in our tolerance design guide and holes and edges design guide.
Process window
Beyond this page, Fused Silica routinely runs through ultrasonic machining, double-side polishing, drilling, laser cutting in our shop – most real parts combine two or three of these steps.
Typical applications
The recurring buyers of dichroic coating fused silica: aerospace optics (sensor windows, star-tracker flats, radiation-tolerant ports); machine vision (camera windows, ring-light diffusers, calibration plates); scientific instruments (reference flats, cells, prism mounts, stage inserts). 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: material selection guide, fused silica material guide, glass-bottom microplates.
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 dichroic coating add?
Wavelength-selective reflection and transmission. Applied by ion-beam sputtering, 40 – 120 layers to cut-on/cut-off slopes < 2% of edge wavelength.
Is there a minimum order for dichroic 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.