Timeline for Why does the light of this infrared laser become visible after reflection?
Current License: CC BY-SA 4.0
15 events
| when toggle format | what | by | license | comment | |
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| May 28, 2021 at 22:35 | answer | added | Árpád Szendrei | timeline score: 0 | |
| May 28, 2021 at 13:36 | history | edited | Peter Mortensen | CC BY-SA 4.0 |
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| May 27, 2021 at 23:39 | comment | added | aquirdturtle | Side note, your iphone camera is almost certainly a CMOS camera and definitely has a pretty good IR filter on it, but the filter is designed to mimic your eye's response to light in order to take pictures accurately. You're eye is slightly sensitive to this light, so the filter would be designed to be similarly transmissive. Without any filters, pictures, especially those taken outside look very unnaturally red. | |
| May 27, 2021 at 20:53 | vote | accept | jamie1989 | ||
| May 27, 2021 at 19:26 | answer | added | tansy | timeline score: -1 | |
| May 27, 2021 at 18:00 | history | tweeted | twitter.com/StackPhysics/status/1397975914802200578 | ||
| May 27, 2021 at 16:27 | comment | added | llama | "when an object is stationary, the reflected beam should lose energy" - this is only true in the sense that reflection isn't 100% efficient. The energy per photon does not change with reflection from a nonmoving object (ie the wavelength doesn't change), unless fluorescence or some nonlinear process is involved | |
| May 27, 2021 at 15:55 | comment | added | Chris H | I have always been able to see 785nm. It's dangerous because it looks at least 1000x weaker than it is (compared to typical red lasers). 830nm is also visible but weaker still. | |
| May 27, 2021 at 15:03 | history | became hot network question | |||
| May 27, 2021 at 8:54 | comment | added | jamie1989 | Goggles are used and mpe calculations are always done. Alignment of the beam is always done with minimal power. Optical benches are covered. Inevitably, you do sometimes forget to put on the goggles whilst walking into the lab, which is how I noticed this. | |
| May 27, 2021 at 8:50 | comment | added | my2cts | What about safety? If you can see this your eyes may be damaged. | |
| May 27, 2021 at 8:06 | answer | added | Andrew Steane | timeline score: 32 | |
| May 27, 2021 at 7:28 | answer | added | Andreas H. | timeline score: 10 | |
| May 27, 2021 at 7:11 | comment | added | jamie1989 | But that will just be the camera picking up the infrared. What you can see in the picture can be seen with your eye. | |
| May 27, 2021 at 7:02 | history | asked | jamie1989 | CC BY-SA 4.0 |