Timeline for Why does Light change color through Glass slab?
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22 events
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| Aug 23 at 0:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 16 at 10:08 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 18, 2023 at 1:04 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 18, 2023 at 10:37 | comment | added | PM 2Ring | Related with photos: physics.stackexchange.com/q/772103/123208 | |
| Aug 18, 2023 at 7:05 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Apr 18, 2023 at 22:33 | comment | added | Ed V | Having just seen this, I decided to try my luck using a 532 nm green laser pointer, 535 nm interference filter (to eliminate any 808 nm light the laser might also inadvertently emit) and a glass plate 1/4” thick and about 2.5” square. All room lightsout, I can see a faint green trace for the light passing through the glass plate. No red and way too dim for me to photograph. So, a null result, but I don’t doubt your observation. Personally, I think it is fluorescence from some impurity in the particular piece of glass you have (or had). Anyway, good question to upvote. Raman seems improbable. | |
| Apr 18, 2023 at 21:03 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Dec 8, 2022 at 21:07 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Nov 8, 2022 at 2:51 | answer | added | Jason Killian | timeline score: 0 | |
| Apr 4, 2016 at 17:24 | comment | added | Adam Karlson | Yes, I know that, but it is akin to raising your voice, which is what I did just to emphasise. The reason why it's rude is because raising one's voice in public is considered rude. Sorry, for the Non-Physics comment | |
| Apr 4, 2016 at 16:22 | comment | added | David Z | @AdamKarlson just letting you know, writing in all caps is generally considered somewhat rude on the internet. Please avoid it in the future. | |
| Apr 2, 2016 at 11:13 | comment | added | Peter Diehr | @adam karlson: <1.000 mW? A green laser pointer? Or what? If a laser pointer see technologyreview.com/s/420214/… They often emit more than one wavelength. I can see 780 nm scatterred in air, so possibly you are seeing 808 nm leakage scattered in the glass. Cheap green laser pointers lack adequare filters, and should be tossed. Test with another, newer laser source. | |
| Apr 2, 2016 at 10:25 | comment | added | anna v | use a piece of paper, or a film, for the beam to fall on. The bulk of photons is elastically scattered and keeps the frequency. I expect you should see a thin halo around the green spot that is red, from the few inelastically scattered inside the glass. ( because they have scattered there will he an angle) | |
| Apr 2, 2016 at 10:07 | comment | added | Adam Karlson | @Anna v... Ok, external scattering results in green, while inelastic internal scattering results in red. Hypothetically, What if i look at the green laser beam ( which one shouldn't), say the beam is 2 feet away. Now, I place a glass slab 1 feet away from myself and look at the beam through it? It's hardly visible but green! The low probability explains green, but why do not these photons change color now?Why? | |
| Apr 2, 2016 at 9:53 | comment | added | Adam Karlson | @Peter Material: Not sure, but it's standard laboratory glass slab. Power: It says <1000mW Nope, no goggles. | |
| Apr 2, 2016 at 3:17 | comment | added | anna v | @AdamKarlson The scattered light outside is elastic, through the glass the photons coming to your eye have not scattered from their original direction in the glass ( to change color) because the probability is very small. It is the huge number of photons in the laser beam that allows for observable scatter. | |
| Apr 1, 2016 at 21:21 | comment | added | Peter Diehr | Please describe the glass in detail -- what is its composition? Is it a standard optical glass, like BK7? Also what is the power of the laser beam? Some glasses can fluoresce, which could give your red color; if the laser fluence is high enough the glass may fluoresce. Also what type of laser goggles are you wearing; these can alter color perception. | |
| Apr 1, 2016 at 18:47 | comment | added | Adam Karlson | Um...Anna. I have also tried looking at the beam through a glass and I can see green. Shouldn't any part of that light going through the glass interact in the same way, thus producing red every time? It's a beam WHICH PASSES THROUGH THE SLAB WHICH IS REDDENED not one being looked at. I hope I am clear, (wish I could explain better) | |
| Apr 1, 2016 at 17:21 | comment | added | anna v | What the eye sees outside the glass slab as green, is the scattered light on molecules of air. What the eye sees when the beam goes through the slab is the scattered light on molecules of glass. As you say that the beam looks again green coming out of the slab, the frequency of the scattered light does not change in the air, an elastic scatter. My first guess is that the scatter in the glass is inelastic and the red color appears ( which could be a perception of red by the retina en.wikipedia.org/wiki/Color_vision ). i am waiting for an optics expert | |
| Apr 1, 2016 at 16:11 | comment | added | Adam Karlson | But it's green when it comes out... And also it is not because the light is being seen through the slab... I kept the slab above the green beam, and looked from above- it was still green. Conclusion: it only occurs when beam PASSES THROUGH the slab. | |
| Apr 1, 2016 at 16:11 | comment | added | garyp | What color is it after it exits the back side of the glass? | |
| Apr 1, 2016 at 15:54 | history | asked | Adam Karlson | CC BY-SA 3.0 |