File:Optical flat test with green and white light.jpg
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Original file (2,305 × 2,785 pixels, file size: 1.32 MB, MIME type: image/jpeg)
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Summary
| Description |
English: A precision glass window ground to a flatness of λ/10, resting upon an λ/10 optical flat, illuminated with both the green 532 nm light from a laser and white light from an incandescent bulb, showing interference fringes which reveal the unevenness of the surface. Image 1 shows that the fringes are fairly straight, with some small deviations, indicated that the surface of the window in very close to λ/10 flatness. The flat has slightly chamfered edges, which shows up as bends near the ends of the fringes. The bottom side of the flat is mirrored, which not ideal, masking some of the fringes.
Image 2 shows the interference fringes in white light. Image 3 is after an hour of wringing, as the surfaces come closer to parallel. Image 3 is after 2 hours or wringing. Images 5 and 6 are taken after the surfaces have fully wrung, becoming parallel. Both the white-light test and the finger-pressure test show that the surface of the window is concave. |
| Date | |
| Source | Own work |
| Author | Zaereth |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
 
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:45, 15 December 2013 | | 2,305 × 2,785 (1.32 MB) | Zaereth~commonswiki | Waited a while, and took some photos of wringing and fully wrung, and added to the mix. |
| 08:48, 15 December 2013 |  | 2,337 × 953 (458 KB) | Zaereth~commonswiki | Increased saturation for the white-light side | |
| 07:38, 15 December 2013 |  | 2,337 × 953 (434 KB) | Zaereth~commonswiki | User created page with UploadWizard |
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