Request a quote Wedged Optical Windows
Custom wedged optical windows for reflection separation and reduced etalon interference.
Product Overview
Wedged optical windows have two polished faces set at a small angle to each other.
The wedge separates reflections from the two faces to reduce overlapping ghost beams and etalon interference, while introducing a small angular deviation in transmission.
Material, outline, thickness, wedge angle, surface flatness, and coatings can be specified for the beam geometry and operating wavelength.
Applications
- Laser Beam Delivery Systems: A wedged protective window directs surface reflections away from the main beam path to help reduce unwanted feedback.
- Laser Spectroscopy: A wedged window reduces parasitic etalon fringes that can interfere with weak spectral measurements.
- Interferometric Instruments: A wedged access window separates unwanted surface reflections from the measurement beam.
- Laser Beam Profilers: A wedged entrance window separates secondary reflections that could otherwise overlap the measured beam.
Typical Specifications
| Parameter | Standard Grade | Precision Grade |
|---|---|---|
| Materials | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request | N-BK7, Quartz, CaF₂, MgF₂, ZnSe, ZnS, and other optical glass upon request |
| Dimensions | Ø3–300 mm or side length 3–300 mm | Ø3–300 mm or side length 3–300 mm |
| Diameter Tolerance | +0 / −0.10 mm | +0 / −0.02 mm |
| Length and Width Tolerance | ±0.10 mm | ±0.02 mm |
| Thickness Tolerance | ±0.10 mm | ±0.02 mm |
| Parallelism | ≤3′ | ≤2″ |
| Surface Figure (P–V) | ≤λ/4 @ 632.8 nm | ≤λ/10 @ 632.8 nm |
| Surface Quality (Scratch–Dig) | 40–20 | 20–10 |
| Surface Roughness (Ra) | ≤1.0 nm | ≤0.3 nm |
| Clear Aperture | ≥85% of overall dimensions | ≥90% of overall dimensions |
| Coating | AR / HR, etc., to customer requirements | AR / HR, etc., to customer requirements |
Other specifications, materials, and coatings are available upon request.