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solar light to laser beam ?

Hello,
would it be possible to concentrate solar light so to form a laser beam ?
In other words would it be possible to apply laser light principles to basic solar light with the help of optics of some sort ?




Picture of solar light to laser beam ?
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veloci88 months ago

So if i am not late... I am trying to do the same thing now but with normal light (flashlight....), so as I understood this. You need to place 2 magnifying glasses, so that the light from the first is fully concentrated (when the dot is smallest), then it needs to pass through the second magnifying glass. And then it should be converted in a laser or a concentrated beam...

Maybe you should read up on the definition of LASER.....
Light Amplification by Stimulated Emission of Radiation....
Three vital parts are missing in your concept:
Amplification, Stimulation and Emission.
Without that all you get is a focussed beam of plain and normal light.

Kiteman veloci88 months ago

Concentrated beam, yes. Laser, no. Read the other comments for reasons why.

twitt501 year ago

It will work, but the question I have is what type of laser are you thinking about developing? You can easily make Light Emitting Diodes (LED) which is a low power laser. If you are looking to make high power laser then you will need lots of money and a lab. This will take a lot of research...I worked on all types of lasers in the mid 1990's when Optics were 1st becoming popular....fun stuff!

bulwynkl2 years ago

so, I've been thinking about this too - because the Israeli military have done this... Taken sunlight, focused it, and fed it down an optic fibre to use as a medical cutting tool. circa 2003. http://www.israel21c.org/technology/scientists-har...

Wanting to do something like this at home is an interesting exercise. First thing to realise is that the sun is not a point source - it subtends about 1/2 a degree in the sky, so the minimum sized spot you can get with a lens or parabola depends entirely on the focal length of the primary lens. You can't get a more tightly focused beam with lenses than that. What you need (open to suggestions) is a way of feeding the entire focused beam into an optic fibre. - the scales are quite different. A 1m lens might focus down to a 1cm spot - sufficient to melt copper at 80kW/m^2, but that's rather large compared to the core of an optic fibre - e.g. communications fibres have a core ~9 um

I've been contemplating a internal reflection concentrator - simplest of which would be a cone of glass mirrored on the outside, possibly partially mirrored on the inside (light goes in, does not come back out.).

this would potentially take the focused beam down to ~1mm^2, or a bit smaller with acceptable loss - suspect energy densities at this point are sufficient to melt most things... and I still haven't reached the size of a typical fibre - any finer and we start running into precision issues beyond the home hobbyist as well. Not to mention that bubbles in the glass start to be a problem at this sort of scale too.

Are there larger optic fibres we could consider at this point?

OK, so the problem isn't as bad as I thought... multi-mode power application silica fibres have a core ~500um... http://www.newport.com/Multimode-Fibers,-Power-Del...

worst case, feed a lot of small lenses into a bunch of fibres and combine into one fibre/MUX

laser-> L.A.S.E.R. -> light amplification by stimulated emission of radiation 1 key feature of the laser is you get ONE and only ONE wavelength produced by the laser. Your lens system is merely increasing power/intensity at a given location, while a laser does have a high intensity it isn't a concentration like a lens is doing. But as suggested there's much simpler solutions to your lighting a room scenario.
Sunlight covers a huge range of frequencies, laser is by definition just one. Also there's something about their waveforms being synchronised, hence the term 'coherent' but I can't be bothered wikipediaring that just now.

I actually designed an optical device which will do exactly what you're wanting; collimate an arbitrary light source into a tight beam, but haven't got around to seeing if it works outside of my computer. I'd need to get it machined or 3d printed. Might get around to it some day.

The results I was getting from my optical previs software were a blowout of about one meter per kilometer. ie a 1mm beam would be 10 cm at 100 meters. And there's no real upper cap on how much power you could put through the thing (depending on the materials used), so it could make a pretty lightweight and cheap 'laser' cutter.

I originally started thinking about it for similar reasons to you; sending energy around, but it's not really practical. To light a room you'd need at least 50 watts of white light, and even the loosest of beams with that much power would cut through almost any material on earth. Or bird, frisbee, trampolining child etc.

Maybe look into liquid core light pipes. I made one out of silicone tube and mineral oil, but the silicone scatters the light too much. Teflon FEP or AF 1800/2400 apparently works pretty good, but is a little tricky to get hold of. Not impossible tho.

Good luck!

Have you checked my post down there lately? If not, then I'll say the single word you want that answers your question.

*drum roll*

YES!!! (as explained in my very long discussion with critterfluffy).
gabdab (author) 7 years ago
I am aware of the 'reflective aluminum pipe from the roof down to your room' solution ,but it is limited to under roof rooms mostly.
Other solution seems to be to use plastic fiber optics to transfere light from a solar concentrator (on the roof) to rooms ( distance or fiber optics length is limited in this case to 200 mts more or less).
So I was wondering it laser could be a viable option is some border cases like covered greenhouses or else..
Diamonds would be cool but maybe you would be burning off some satellite here and there occasionally with a 'death ray' sort of thing.
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