Laser COLOR limits data capacity?!?

What can a rainbow tell us about the limits of focusing a laser? Focusing a laser beam into a tiny spot is important in many technologies. In this video I will go through two examples: optical discs like CDs, DVDs and Blu-rays as well as laser engravers. Does the wavelength of the laser matter? Let's find out! Thank you very much to Edwin En-Te Hwu and Anja Boisen for letting me use their illustration! Link to their publication with even more, interesting info: https://pubs.acs.org/doi/10.1021/acssensors.8b00340 Edwin Hwu's channel: https://www.youtube.com/c/EdwinHwuHacks4Science/videos Laser engraver Aufero Laser 1 and accessories donated by Ortur: https://www.aliexpress.com/item/1005003346728741.html?spm=5261.ProductManageOnline.0.0.34584edfdntv2L Why does light bend? (Fermilab): https://www.youtube.com/watch?v=NLmpNM0sgYk Why does light slow down (Fermilab): https://www.youtube.com/watch?v=CUjt36SD3h8 Calculate photon energy: https://www.omnicalculator.com/physics/photon-energy Calculate focus spot size: https://wavelength-oe.com/optical-calculators/focus-spot-size/ Calculate depth of focus: https://wavelength-oe.com/optical-calculators/depth-of-focus/ My Patreon-page: https://www.patreon.com/Brainiac75 Make your own laser beam dump: https://youtu.be/rRIlhskMYAM My strongest laser, 5W laser vs. 5W LED: https://youtu.be/vUwP7SY0Ajs Did you miss one of my videos?: https://www.youtube.com/user/brainiac75/videos FULL MUSIC CREDITS Time code: 0:01 "Fluidscape" Kevin MacLeod (incompetech.com) ISRC: USUAN1100393 Time codes: 0:41 + 7:36 + 8:57 "Lightless Dawn" Kevin MacLeod (incompetech.com) ISRC: USUAN1100655 Time codes: 3:21 + 5:00 "Darkness is Coming" Kevin MacLeod (incompetech.com) ISRC: USUAN1100584 (Looped by me) Time code: 4:19 "Impact Lento" Kevin MacLeod (incompetech.com) ISRC: USUAN1100619 Time code: 4:46 "Ossuary 6 - Air" by Kevin MacLeod (incompetech.com) ISRC: USUAN1500048 Time code: 6:41 "Light Awash" Kevin MacLeod (incompetech.com) ISRC: USUAN1100175 Time code: 9:29 "Adding the Sun" Kevin MacLeod (incompetech.com) ISRC: USUAN1900041 All music above licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/ Time code: 8:28 Mix of two tracks: 1) The Shimmering by fran_ky (freesound.org/s/237363) Licensed under Creative Commons 0 license 2) "Spacial Harvest" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/ ISRC: USUAN1100653 #Laser #Rainbow #Brainiac75