I would like use annular illumination with a LEDs ring illuminator or a optical fibers (a bundle) for an uniform (or relatively) of a surface (disk) of about few cm diameter?
Dear Mihail, I recommend you diffuse illminator for more uniform illumination over a few cm diameter surface using a dome diffuser combined with LED ring or optical fiber bundle. Otherwise, you will suffer from hot sopt issue. Regards, Shigeo
Many thanks, Shigeo.
I am thinking to that:
https://www.thorlabs.com/thorproduct.cfm?partnumber=FRI61F50
What do you think?
Mihail, Hot spot is harmful, when you want perfect uniformity. In my experience of miscrospcope image photos, they have been always accompanied with this. So, I recommend you diffuser dome. It should be as uniform as in integrating sphere in principle. But your intension is relatively uniform illumination, Thorlabs ring is not bad. Regards, Shigeo
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