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Many lasers into one, by means of fiber glass

Posted by TheTechnicalNoob 
Many lasers into one, by means of fiber glass
February 02, 2014 11:08PM
Here the article describes how many lasers have been combined into one by means of fiberglass rods. If this works out to be practical perhaps this could be a way to use fifty 0.2watt dvd lasers to form a 10watt sintering laser.

Anyways, just an idea.. I just wanted to throw this out there.
Re: Many lasers into one, by means of fiber glass
February 04, 2014 01:04PM
Hi TheTechnicalNoob,

Optical fiber lasers have been out for quite some time now (BTW, no relationship with fiberglass whatsoever). These are quite inexpensive if made in China. [en.wikipedia.org] [www.rp-photonics.com]

bowzee
VDX
Re: Many lasers into one, by means of fiber glass
February 07, 2014 05:40AM
... read here - [www.photonlexicon.com]


Viktor
Re: Many lasers into one, by means of fiber glass
May 05, 2014 11:20PM
You can't combine lasers like this, unless they are exactly the same wavelength, and in phase with each other, or completely different wavelengths. Otherwise, you get a bunch of destructive interference, and don't actually end up with more power. Actually, this is not quite true, as you can combine two of them at different polarizations with a polarizing beam splitter.

Using multiple diodes of the same wavelength won't get you much as a result, since the wavelengths are not controlled, unless you also temperature control them. This is the reason that people usually knife edge the beams to stack them, and combine them that way, alas this type of multimode beam will not focus to a spot at all.

You can find many articles that describe these beam combining problems on the laser forums, like photonlexicon.


Mike Anton
[manton.wikidot.com]
[laserlight.wikidot.com]
Re: Many lasers into one, by means of fiber glass
July 08, 2015 04:48AM
Would you not just use multiple identical lasers, collimating lenses with known focal length fed to another collimating lens in to the optic cable?
Re: Many lasers into one, by means of fiber glass
July 08, 2015 12:28PM
Not really. As the waves of light would start to interfere with each other and start to cancel each other out. So you would have to get the wave lengths into sync with each other which isn't practical.
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