Good morning all, I'm currently working in some undergraduate research involving lasers and recently had the opportunity to play around with a few that my research professor has at our disposal. I've included a picture below of a strange phenomenon that has me a little puzzled, but then again I haven't taken any optics courses. https://scontent-ord1-1.xx.fbcdn.net/hphotos-xat1/v/t1.0-9/12509680_10156372942255580_8733921899061724202_n.jpg?oh=6d59dee08a311015be6e8811bd211c64&oe=573793A9 While the quality of the image isn't the best, what I've done is place the outputs of three 90 mW lasers of 656 nm, 532 nm, and 405 nm up on a wall located in a room with very little to no textural disturbances on the surface of the wall. I can't seem to understand why the green laser would have such an enormously wide output compared to the two others. Is there a property in optics that might explain this? I thought maybe diffuse reflection would be greater for longer wavelengths or something along those lines, but the red laser would have to display that property too, so I'm a little stumped. Any ideas?