---
title: Catalog RFQ Sapphire Windows
---

[![Ross Optical](https://custom-optics.rossoptical.com/hs-fs/hubfs/Ross-POCI-Logo-Horizontal.png?width=200&height=86&name=Ross-POCI-Logo-Horizontal.png "Ross Optical")](https://www.rossoptical.com)

# Sapphire Windows

Windows made of Sapphire are similar to fused silica windows, except their surface is harder, the refractive index is higher, and they are more resistant to chemical damage.

| Material | Optical Sapphire (Al2O3) |
| --- | --- |
| Axis Orientation | Random |
| Dimensions | MM |
| Diameter Tolerance | + 0 / -0.10mm |
| Thickness Tolerance | ±0.10 mm |
| Clear Aperture | 90% |
| Surface Quality | 60-40 Scratch-Dig |
| Parallelism | < 1 Arc Minute |
| Coating | Uncoated (*See [Coating Chart](https://www.rossoptical.com/capabilities/optical-coatings) for Available Options*) |
| ** All dimensions are in mm* |  |