Timeline for The need of the reference beam in Holography
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| Jan 15, 2021 at 9:34 | comment | added | Cees Timmerman | "Zone plates use diffraction instead of refraction or reflection. Based on analysis by French physicist Augustin-Jean Fresnel, they are sometimes called Fresnel zone plates in his honor." | |
| Jan 15, 2021 at 9:33 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
explain strict dictionary definition and need for diffraction caused by interference
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| Jan 15, 2021 at 9:14 | comment | added | Cees Timmerman | The Mirascope is more holo (whole) but less gram (record) without replicating the 3D object. | |
| Jan 14, 2021 at 23:42 | comment | added | PM 2Ring | A Mirascope is a matched pair of parabolic mirrors. It produces a "hologram-like" 3D image, but its principle of operation has little to do with actual holograms. Please see physicstoys.blogspot.com/2018/02/the-mirascope.html | |
| Jan 14, 2021 at 23:08 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
added non-diffraction hologram example for the mysterious downvoter
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| Jan 14, 2021 at 17:28 | comment | added | Cees Timmerman | Even in scratch holograms? Are reflective/refractive holograms impossible? | |
| Jan 14, 2021 at 16:30 | comment | added | garyp | The Fresnel "patterns" impressed in holography operate be diffraction, while Fresnel lenses operate by refraction. They are different phenomena. Hence the possibility of confusion. | |
| Jan 14, 2021 at 14:33 | comment | added | Cees Timmerman | I came here because i had the same question as OP yet knew about Fresnel lenses because those are easy compared to holograms which turn out to contain many more of them, even in transparency grate zone plate form. | |
| Jan 14, 2021 at 14:00 | comment | added | garyp | Keep in mind that this is a site for education. If someone knows the answer, they wouldn't be here. One often has to infer the questioners level of physics knowledge from hints in the question, and it only makes sense to respond at an appropriate level. In this case, uncertainty about the need for a reference beam suggests that the OP might not know about Fresnel "patterns", and in fact, there could be confusion with the Fresnel lens. | |
| Jan 14, 2021 at 13:28 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
added 43 characters in body
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| Jan 14, 2021 at 13:14 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
added 151 characters in body
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| Jan 14, 2021 at 13:06 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
better formatting
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| Jan 14, 2021 at 13:00 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
add link saying holograms with 3D objects also work
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| Jan 14, 2021 at 12:52 | history | edited | Cees Timmerman | CC BY-SA 4.0 |
added 218 characters in body
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| Jan 14, 2021 at 12:46 | comment | added | Cees Timmerman | @garyp If you know what a Fresnel lens is and does, as could be assumed on a physics site like this, then it is obvious to me that the light cones it creates (burning an object at its focal point) are the inverse of those the interference pattern of the laser creates (burning the lens). | |
| Jan 14, 2021 at 12:21 | comment | added | garyp | The comment about Fresnel patterns is interesting. But it stands as a comment, not an answer, unless you explain what you mean and how it arises. | |
| Jan 14, 2021 at 11:55 | history | answered | Cees Timmerman | CC BY-SA 4.0 |