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Zemax: how to control diameter of the light ring?

thread386-296640

Zemax: how to control diameter of the light ring?

Zemax: how to control diameter of the light ring?

(OP)
Hi,

I am using Zemax software. I want with axicon and lens make a ring of light (dia100um), but I don't how to control the diameter ligth (what operand do I have to use?) in the merti function. The light input is dia15mm. Can anyone help me?

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