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Fiber coupled laser beam very wide

Branson33

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How would I got about making a 660nm fiber coupled laser that has a super wide beam while aimed at a wall look more like a laser pointer, it is 500mw so I want to make it burn but I'm not sure how to make the beam into a focused point thank you!
 



H2Oxide

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This is your THIRD thread about this laser. Please ask additional questions pertaining to this laser in already existing threads.

Fiber-coupling is typically used to deliver laser light directly to where it needs to be, (e.g. for telecommunications or for use as an optical pump) and is therefore a poor choice for typical hobbyist applications such as burning, projecting, or holography where the beam itself is preferably collimated and can travel through air with relatively good divergence.

Since you had to ask this question, I'm going to assume that you do not have a myriad of laser optics on stand-by, which is what would be required to properly shape the light back into a "pointer-like" beam.

If you absolutely must shape the beam back into a column, this page will contain most, if not all of the relevant info needed to accomplish this task.

However, if you just want to be able to burn things with your laser, a magnifying glass should suffice. You won't have a nice, collimated beam, but it should burn objects placed at the focus. There will be a considerable amount of reflection too, so be sure to pick up some good-quality laser goggles (not the cheap $5 ones from eBay) BEFORE you turn the laser on.

Also, since I doubt you have an optical breadboard at your disposal, make sure that if you mount the fiber/optics to something that they are very secure. You don't want a 500mw fiber flailing all over the place as it falls to the ground. Trust me. :whistle:
 

Branson33

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I'm sorry I post more than one thread about this laser, but it seems that posting in a different topic seems to get more people to see it and answer faster. But thank you for the answer I will try the magnifying glass if that doesn't work then I will buy a special lens I saw somewhere I forget what it's called but it starts with an a. But thank you again.
 

diachi

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I'm sorry I post more than one thread about this laser, but it seems that posting in a different topic seems to get more people to see it and answer faster. But thank you for the answer I will try the magnifying glass if that doesn't work then I will buy a special lens I saw somewhere I forget what it's called but it starts with an a. But thank you again.
You're not going to get a narrow beam from a fiber, at least not with any reasonable divergence. It'll be nice and round at least ... but fat as hell.
 

Alaskan

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A magnifying glass will certainly focus the highly divergent output of a fiber laser into a small point and burn well.
 
Last edited:

lasersbee

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How would I got about making a 660nm fiber coupled laser that has a super wide beam while aimed at a wall look more like a laser pointer, it is 500mw so I want to make it burn but I'm not sure how to make the beam into a focused point thank you!
Buy a 500mw Red Laser Diode and you won't need all
the optics to recombine multiple Laser beams.

BTW Stop posting the same thing on multiple threads.
This is an internet Forum and all members are not here
24 hours a day to answer questions.
A little patience keeps you from getting Red Bars...

Jerry
 




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