Looking for flexible light pipes and fiber optic cables for laser...sal

Greetings ALL

I have a 4mw laser pen that I would like to put a cap on so I can direct the laser light In the direction I choose. Something like flexiable light pipes see link below

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The problem is:

1) the laser won't fit the fiber optic 2) the light at the other end of the fiber optic is not a pin point light (like a laser), the light ends up being more like a flashlight.

Any suggestions?


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If you put light through a fiber it will diverge severely on exiting the fiber. It is a physics problem. The only fix is to put a lens on the end of the fiber, either a separate one or lensing the fiber itself. The larger the fiber core the less divergence there will be but you will still need a lens.

P. Danek

snipped-for-privacy@spp.net wrote:

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(like a laser),

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This looks to be a large core fiber, something like 2 mm core diameter. This is a core diameter much bigger than you really need to transport light from a laser, especially if you are looking for a small diameter laser beam out the exit end of the fiber.

Here is the way it is normally done: Laser--->Focusing lens-->Fiber-->Collimating lens---->giving a collimated beam at the output of the fiber. The diameter of the collimated beam will depend on the focal length of the collimating lens. For a very small diameter beam (~ 1 mm diameter) you will need to use a singlemode fiber (core diameter ~3-9 microns, depending on the wavelength of hte laser), and a short focal length collimating lens (~2-5 mm focal length, which is normally done with a molded asphere lens).

Coupling to singlemode fibers from a laser requires positioning to the micron level, which is not easily done without proper equipment. You can also couple to a multimode fiber (such as a 62.5 micron core or a

100 micron core), which will make coupling into the fiber easier, but you will not be able to produce well-collimated small diameter beams at the far end of the fiber.


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Anthony Cook

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