Timeline for Bragg Diffraction with Lasers?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 30, 2021 at 11:44 | comment | added | Gert | No, I need to look up how to do that again. Also, need to check for 2nd order. I would urge you to try with your $432\,\mathrm{nm}$ laser. Also, it's clear your banner and mine aren't the same: with the green laser I get enormous amounts of scatter. | |
| Nov 29, 2021 at 23:33 | comment | added | Farcher | @Gert Were you able to get an estimate of the spacing? | |
| Nov 29, 2021 at 22:01 | comment | added | Gert | My result is great with a blue $432\,\\mathrm{nm}$ laser (unfortunately the photos are too heavy (>2 meg) to upload. It also seems my plastic generates much more scatter, at least with the green laser... | |
| Nov 26, 2021 at 20:23 | comment | added | Gert | That's very interesting too. The banner show very vivid diffraction. The material is highly anisotropic though. I'll try that thing about the silver spots. The laser should be fine: I've run countless double slits before. Ta. | |
| Nov 26, 2021 at 17:05 | comment | added | Farcher | Try making a double slit as I explained here, How can a double slit interference pattern be created without out going through a double slit to check the laser. PS I am just going to borrow my wife's opal! | |
| Nov 26, 2021 at 17:05 | comment | added | Farcher | About seven years ago from Amazon (UK) Green/Red/Blue Beam Laser Pointer Combo 3 Laser Light Pens 1mw 532nm 650nm 405nm Triple Colors Astronomy Powerful. I would suggest it is the banner which might be at fault? I have just checked and the diffraction pattern can be formed from all parts of the banner although better when the light passes through the silver bit. | |
| Nov 26, 2021 at 15:52 | comment | added | Gert | What laser did you use? With my $532\,\mathrm{nm}$ green laser I'm getting very variable results but nothing as definite as your result. Interestingly my red $650\,\mathrm{nm}$ laser shows $zero$ diffraction, indicating the "$d$" must be smaller than that value. | |
| Nov 24, 2021 at 19:18 | vote | accept | Gert | ||
| Nov 24, 2021 at 18:59 | comment | added | Gert | I've also bought a similar Happy Birthday banner with those interesting 'ecanescent' colours, so time to experiment. | |
| Nov 24, 2021 at 18:56 | comment | added | Gert | Yes, of course. For that reason Opal should also be useable for 'laser $\text{XRF}$' because its fleeting colours are due also to diffraction. Time to buy! | |
| Nov 24, 2021 at 18:26 | comment | added | Farcher | I wondered about the colouration of the banner which was characteristic of a diffraction/interference pattern. Shifting colours as the banner or my eyes moved. | |
| Nov 24, 2021 at 17:25 | comment | added | Gert | Hey, that's wonderful! So you shone the laser (a pointer pen?) straight (perpendicularly) on the material? What gave you the idea? | |
| Nov 24, 2021 at 17:21 | history | answered | Farcher | CC BY-SA 4.0 |