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OPTICAL FLAT
An optical flat is a piece of glass that has been precision polished to a specific flatness on one or both sides. Optical flats may be used as a reference (test plate) against which the flatness of an unknown surface can be compared or also as an optical window.
For over 50 years Advanced Optics has taken great pride in manufacturing the highest quality optical flats. Our extensive stock of optical flats is available in a wide variety of accuracies (s (λ/4, λ/10 and λ/20). A wide range of in-stock materials, paired with our years of experience allows us to provide a high degree of parallelism to meet the most challenging and exacting applications.
SINGLE AND DOUBLE SIDED OPTICAL FLAT SPECIFICATIONS:
- In-stock optical flats precision polished up to 8 inches in diameter.
- Ability to polish up to 12 inches in diameter.
- Accuracy of λ/4, λ/10 or λ/20 available, many in-stock for immediate shipment.
- Every optical flat comes with a Certificate of Calibration traceable to the NIST.
- Extensive stock of raw materials available in-house for fast turnaround.
- In-stock optical flats uncoated with the option of adding an anti-reflective coating.
- Custom fabrication available including custom sizes, shapes, holes, bevels and coatings.
- Optical flat resurfacing with a fast turnaround.
AVAILABLE MATERIALS
Advanced Optics carries an extensive stock of raw materials including:
View our in-stock single and double sided fused silica optical flats below:
| Surface Accuracy: Single or Double Sided Flat | Diameter | Fused Silica (Thickness) |
| λ/20 (0.000001") | 25.4 (1") | 12.7 (1/2") |
| λ/10 (0.000002") | 25.4 (1") | 12.7 (1/2") |
| λ/20 (0.000001") | 50.8 (2") | 15.9 (5/8") |
| λ/10 (0.000002") | 50.8 (2") | 15.9 (5/8") |
| λ/20 (0.000001") | 76.2 (3") | 15.9 (5/8") |
| λ/10 (0.000002") | 76.2 (3") | 15.9 (5/8") |
| λ/20 (0.000001") | 101.6 (4") | 19.1 (3/4") |
| λ/10 (0.000002") | 101.6 (4") | 19.1 (3/4") |
| λ/20 (0.000001") | 127 (5") | 19.1 (3/4") |
| λ/10 (0.000002") | 127 (5") | 19.1 (3/4") |
| λ/20 (0.000001") | 152.4 (6") | 25.4 (1") |
| λ/10 (0.000002") | 152.4 (6") | 25.4 (1") |
| λ/20 (0.000001") | 203.2 (8") | 33.8 (1.33") |
| λ/10 (0.000002") | 203.2 (8") | 33.8 (1.33") |
The accuracy of each optical flat is traceable to the National Institute of Standards and Technology.
Fused Silica Technical Data Sheet from Corning Incorporated (pdf)
Optical Flat Interpretation
Double Surface Optical Flat/Optical Window
Advanced Optics offers in-stock fused silica double sided optical flats that may also be used as optical windows. Fused silica offers superior transmission characteristics, a high degree of purity, exceptional environmental durability and a low coefficient of thermal expansion.
Dual Surface Optical Flats/Optical Windows are an excellent choice when an optical system requires separation between two environments while passing a specific wavelength(s) of light or for demanding interferometry requirements.
Whether you require custom optical fabrication or one of our many off-the-shelf flats, call today for a competitive quote!
(1/2 wave)
(top view of optical flat)
Perfectly Flat
(top view of optical flat)
Additional information about optical flat interpretation and how to select the correct optical flat for your application can be found on our Optical Flat Techinical page.