Windows protect without selecting wavelength
Optical windows are usually chosen to protect the optical path while keeping wavefront and transmission stable. Substrate and coating are the main decisions.
Optical Windows for UV, Visible, and IR Systems
Compare optical windows by material, coating, size, thickness, and transmission range. Use this page when the component must protect an optical path without changing the signal more than necessary.
12+ Years Experience
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ISO 9001 Certified
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Shipped to 60+ Countries
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99.8% Quality Rate
Selected Models
- Contact us for recommended models.
How to Choose
Choose material by wavelength range and mechanical environment. Sapphire is useful for durability, fused silica for UV, BK7/K9 for visible systems, and calcium fluoride for selected IR paths. Confirm coating, flatness, surface quality, and mounting tolerance.
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Optical Windows
OPTOStokes optical windows provide excellent transmittance across UV (200-400nm), visible (400-700nm), and IR (700-3000nm) spectra. Available materials include sapphire (high durability), K9/BK7 (visible), fused silica (UV), and calcium fluoride (IR), with uncoated, AR, or custom coating options. hese windows are suitable for laser protection windows, detector covers, and optical chamber windows.
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| Model | Material | ransmittance | ransmission Range (nm) | Note |
|---|---|---|---|---|
| Uncoated optical window | Sapphire glass | ave ≥≥85% | 350-3000 | |
| Uncoated optical window | Quartz glass | ave ≥≥93% | 250-2500 | |
| Uncoated optical window | BF33 | ave ≥92% | 350-2500 | |
| Uncoated optical window | K9 | ave ≥≥91% | 370-2500 | |
| Uncoated optical window | D263 | ave ≥≥91% | 370-2500 | |
| Single-side AR coated optical window | B270 | ave ≥≥91% | 370-2500 | |
| Single-side AR coated optical window | K9 | ave ≥≥94% | 400-700 | |
| Single-side AR coated optical window | K9 | ave ≥≥94% | 800-1100 | |
| Double-side AR coated optical window | K9 | ave ≥≥98% | 400-700 | |
| Double-side AR coated optical window | K9 | ave ≥≥98% | 800-1100 | |
| Double-side AR coated optical window | Quartz glass | ave ≥99% | 400-700 | |
| Double-side AR coated optical window | Quartz glass | ave ≥≥99% | 800-1100 | |
| Double-side AR coated optical window | Quartz glass | ave ≥≥99% | 1350-1650 |
Related Engineering Notes
When AR coating is useful
AR coating helps when reflection loss or ghost images affect performance. Single-side and double-side coating serve different mechanical and optical needs.
Mechanical fit matters
Diameter, thickness, flatness, surface quality, and mounting stress can affect system performance even when transmission looks acceptable.
FAQ
What is an optical window used for?
It protects sensors, lasers, chambers, or optical paths while transmitting the required wavelength range.
How do I choose window material?
Choose based on wavelength transmission, mechanical strength, thermal behavior, and environmental exposure.
Are AR coatings available?
Yes. Single-side, double-side, and custom anti-reflection coatings can be specified for target wavelength ranges.
Quality & Compliance
Documentation-ready optical filter supply
For OEM programs, laboratory instruments, and industrial systems, OPTOStokes keeps quality, material compliance, and engineering support visible from the start of supplier evaluation.
Quality system
ISO 9001 managed production
Process control, inspection records, and repeatable coating workflows for production optical components.
Material compliance
RoHS / REACH support
Compliance documentation can be prepared for qualified projects and regulated supply chains.
Factory-direct
Custom coating and dimensions
Wavelength, FWHM, substrate, AOI, size, and mounting requirements can be reviewed with engineering.
Procurement ready
Quote and data review
Share target wavelength, blocking level, transmittance, and drawing requirements for a focused quote.
Ready to Find Your Filter?
Our engineers will help you select the perfect optical solution.