Re: Help: how to couple light into photonic crystal fiber?

dgross01_at_comcast.net
Date: 12/08/04 

Date: Wed, 08 Dec 2004 01:07:07 GMT

On 7 Dec 2004 14:02:07 -0800, "Jim" <jmgong74@tom.com> wrote:

>I need to couple the light of a Tungsten or Xenon lamp into a
>single-mode photonic crystal fiber.
>I am now using a condensor followed by a lens with aperture of 50mm and
>focus length of 200mm. But i can get less than 1uW output from the
>fiber.
>Does anyone have good idea?
>Thanks a million!

Radiance can not be increased. The best that can be done is to fill
the extent and angles of the fiber with the radiance of the source.
Usualy this is done by butting the fiber up to the source. If the
source is to small to fill the angles that propogate, a lens will
match the F# of the fiber.
To set up you can work backwards with light coming out of the fiber.
Use a lens that covers all the light coming out. At the focus put the
source, by source I mean the coil, arc or other part that has the max
radiance. The fiber view of the lens will be flashed, showing the
radiance of your source, as good as it gets.

Dave

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