Wedged windows can eliminate fringe patterns and be used to help avoid cavity feedback. Paralight Optics offers wedged windows fabricated from N-BK7, UV Fused Silica, Calcium Fluoride, Magnesium Fluoride, Zinc Selenide, Sapphire, Barium Fluoride, Silicon, and Germanium. Our wedged laser windows have a wavelength-specific AR coating centered around commonly used laser wavelengths on both surfaces. In addition, wedged beam samplers with a broadband AR coating on one face and optical ports that incorporate wedged windows are also available.
Here we list Sapphire Wedged Window, Sapphire is the material of choice for very demanding applications that benefit from reliability, strength, a broad transmission range, or low transmitted wavefront distortion at both high and low operating temperatures. It is transparent from the UV to the IR and can be scratched by only a few substances other than itself. These sapphire windows are available either uncoated (200 nm – 4.5 µm) or with a broadband AR coating deposited on both surfaces. The AR coatings are specified for either 1.65 – 3.0 µm (Ravg < 1.0% per surface) or 2.0 – 5.0 µm (Ravg < 1.50% per surface). Please check the following graphs for your references.
30 acrmin
Eliminating Etalon Effects and Preventing Cavity Feedback
Available Either Uncoated or AR Coated as Request
Different Designs, Sizes and Thickness Available
Note: Back reflections from wedges are Not collinear with the Incident Beam
Substrate Material
N-BK7 (CDGM H-K9L), UV fused silica (JGS 1) or other IR materials
Type
Wedged Window
Size
Custom-made
Size Tolerance
+0.00/-0.20mm
Thickness
Custom-made
Thickness Tolerance
+/-0.10 mm
Clear Aperture
>90%
Wedged Angle
30+/- 10 arcmin
Surface Quality (Scratch - Dig)
Typical: 40-20 | Precision: 40-20
Surface Flatness @ 633 nm
Typical ≤ λ/4 | Precision ≤ λ/10
Chamfer
Protected < 0.5mm x 45°
Coating
AR coatings on both sides
Laser Damage Threshold
UVFS: >10 J/cm2 (20ns, 20Hz, @1064nm)
Other Material: >5 J/cm2 (20ns, 20Hz, @1064nm)
♦ The following graphs show the transmission at normal incidence of our 5 mm thick, AR-coated sapphire windows for 1.65 - 3.0 µm (Ravg < 1.0% per surface) and for 2.0 - 5.0 µm (Ravg < 1.50% per surface).
♦ We also supply planar windows with a variety of substrate materials and coating options. For more information on windows or get a quote, please contact us.