ANTGLASS manufactures custom laser windows for beam delivery, laser enclosures, cutting and welding equipment, laboratory lasers and photonics instruments.
A laser window must be selected for the wavelength, beam power, pulse duration, angle of incidence and environment. Material absorption, surface quality, flatness, wedge and coating all influence heating, reflection and beam quality.
Product Types and Selection
| Laser window type | Primary use | Material direction |
|---|---|---|
| Fused silica laser window | UV, visible and near-infrared beams; low thermal expansion | Synthetic fused silica or high-purity quartz |
| N-BK7 laser window | Visible and near-infrared instruments at moderate power | Optical crown glass |
| CaF2 window | UV-to-infrared transmission | Calcium fluoride crystal |
| CO2 laser window | 10.6 µm beam transmission | ZnSe or selected infrared material |
Material Options
The most common starting point is fused silica because it combines broad transmission, low thermal expansion and strong laser use. Heraeus Suprasil supports demanding high-purity optical systems, while CaF2 extends into UV and infrared bands.
Specifications to Put on the Drawing
- Laser wavelength and bandwidth
- Continuous or pulsed power conditions
- Beam diameter and clear aperture
- Angle of incidence and polarization
- Flatness, wavefront, parallelism or wedge
- AR coating and laser-damage requirement
ANTGLASS Manufacturing Capabilities
ANTGLASS cuts, contours, drills, chamfers, laps and optically polishes laser-window materials. Controlled-wedge, Brewster-angle, round and custom mounting geometries are manufactured from drawings. Cleaned components are supplied uncoated, coating-ready or with the specified coating route.
Inspection, Cleaning and Packaging
The release plan controls clear aperture, surface quality, flatness or wavefront, wedge, coating side and edge condition. Packaging separates polished surfaces and identifies orientation.
Typical Applications
Laser windows are supplied for cutting, welding, marking, engraving, UV curing, beam delivery, laser protection and scientific photonics systems.
Laser Window Selection and Design Rules
A laser-window specification begins with the operating wavelength, but wavelength alone is not enough. Continuous-wave power, pulse energy, repetition rate, beam diameter and hot spots determine the power density at the surface. The material and coating must keep absorption low enough to avoid thermal lensing, coating damage and fracture.
Back-reflection can be controlled with an anti-reflection coating, a small wedge or a Brewster-angle design. A wedged window changes beam direction, so the wedge magnitude and orientation must be included in the optical layout. The mounting should support the window without point loading or contamination in the beam zone.
- State continuous or pulsed operation and the maximum beam condition.
- Define the usable aperture and beam location under all alignments.
- Specify coating band, angle of incidence and polarization.
- Identify allowed transmitted wavefront and surface-quality limits.
- Define replacement, cleaning and handling requirements for the equipment.
Laser systems operating outside the visible and near-infrared range may require infrared optical windows or wavelength-selective filter glass components.
Frequently Asked Questions
Which material is best for a laser window?
Fused silica is widely used for UV, visible and near-infrared laser windows because of its low thermal expansion and optical performance. N-BK7 is used for many visible and near-infrared systems, CaF2 extends into UV and infrared bands, and ZnSe is used for CO2 laser wavelengths.
What is the difference between a laser window and a protective glass cover?
A laser window is specified for a defined wavelength, power and beam path. Its material, polishing, flatness, wavefront, surface quality and coating are controlled to reduce absorption and optical distortion. A general cover glass mainly provides physical protection.
Can ANTGLASS manufacture wedged or Brewster-angle laser windows?
Yes. ANTGLASS manufactures controlled-wedge, tilted and Brewster-angle window geometries from drawings, together with custom edges, mounting features and coating masks.
Can laser windows be supplied with an anti-reflection coating?
Yes. Laser windows can be specified with wavelength-matched anti-reflection coatings or supplied as coating-ready polished components. State the wavelength band, angle of incidence, polarization and damage requirement.
What data is needed for a laser window RFQ?
Provide the wavelength, power or pulse energy, beam size, angle of incidence, material, clear aperture, flatness or wavefront, surface quality, wedge, coating, drawing and quantity.