Recent content by LordKaramazov

Thats about right, when you consider the grand approximation. Even more accurate is the introduction of the nailed it correction which is: schfifteenteen point five and half third MINUS the number that also represents the weight of a new-born snail(of the Helix aspersa species), at exactly...

I did not mean to state, that stars make this natural lasers (I corrected after your observation...i do not know-also didnt search for-of scientific evidence of laser light out of a star. When i wrote my first post (i guess i should edit it) i was thinking of stellar gases, and the Nature...

i could also argue that if all those wavelenghts werent coherent with each other (in time and space) you wouldnt be able to see the intereference between them. each wavelength there is coherent to itself and to the others. They change their phase properties at the same time, keeping them...

Well, i can give you a real example of single lines white light source (instead of broadband) where the light is coherent (so, the second harmonic generation is a non-linear optical effect of the second order, when you go to the 3rd order, there is a process called four-wave mixing) where you...

even talking about CW or not, 2 different, single line lasers (although real CW doesnt exist, every laser has a finite bandwidth) can be coherent with each other or not. In the case of the 3 different sources where you then combine them together, well, yeah those are incoherent with each other...

mode-locking (i work with this every day...I should say its awesome! :D Consider your nits picked:eg:

You are right...When i posted the first time i was writing without thinking. Like the article said, this happens in stellar gases. But even in a star, you have a quite dense plasma, but it does not mean that you do not have neutral atoms. Actually there are lots of neutral atoms. A simple...

I didnt read all, Im in the laser optics field, and it does indeed occur in nature. Its called random lasing, and we also try to do it with randomly deposited nanoparticles in thin film layers. This makes a cavity a non necessary thing for a laser. There are stars that do this all the time, and...

Well...you can...I'm working with one right now.... but :shhh: dont tell anyone :D (best part is when we separare it chromatically and you see a perfect laser rainbow! :drool: ) To EpicHam: If you want a beam and not a projector, then TTL modulate the 3 different lasers until you get the...

1- you were wrong. We do not only use gaussian beams. Depending on many factors, either you use gaussian or not. For example 532 and 473 are gaussian, while 450nm (the direct injection one) is not. The diode has a fast diverging axis and slow diverging axis, making it rectangular in the far...

the thing is that for our eyes, the difference between 638nm to 660nm is not so noticeable as from 405 to 450, same power. At least from my experience. it has to do with absorption bands of our cones and also because of the transmisson of the eye lenses. at 405 transmission starts getting very...

I didnt read the last 3 or 4 posts. 1- you can use an IR laser any time of the day. Im still not sure of the distance you need to cover. by 400' i assumed 400 feet (121m). A really well collimated 808 or 700nm beam (which you would need to know how to collimate, as you cannot see it) would...

I would always recommend more red than green for yellow (which is necessary for the while light). In a ratio of about 1 green to 3 red. As you go to higher powers though, you dont need to keep this ratio so high and you could go to 1:2. For blue id say somewhere between green and red power...

You are comparing 750mW to 2W...thats more than twice the power...get ur 445 at 1W and do the same 2 feet experiments...the blu-ray will be better due to being single-mode direct injection diode and have a smaller radius at focus, while the 445 will have a bigger focus point, and in this case...

Omg a carpet is lasing!