Criticalillumination

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Nonimaging optics

When checking however the edmund optics site a completely different (to my understanding) aproach is presented. https://www.edmundoptics.com/knowledge-center/tech-tools/koehler-illumination/ What is the principle of this design?

Collimated beams are very useful in laboratory setups with fiber-coupled LEDs, because the beam diameter remains fairly constant to work with other optical components and avoid excessive beam expansion.

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If a point source is placed at the front focal point of a positive lens, the beam leaving the lens would be a parallel beam by definition. However, a parallel beam is an ideal concept and does not exist in practice. A point source is only an approximation whereas real sources have some geometric extent. The spherical wave from the point source also undergoes diffraction by the lens. In any case, the exiting beam is now called a collimated beam although not perfect. Hence, the beam leaving the collimator will not be of constant diameter, but slightly expanding. LumeDEL Collimating Lenses use aspherical lenses which are best for high NA fiber collimation.

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LumeDEL had its genesis when the founders realized that an increasing number of life sciences, medical, scientific, and industrial customers needed the performance of a fiber-coupled LED for their applications.

A reflected light meter with spot metering (using the device's camera) and an incident light meter (using the device's light sensor) in one app.

I made the below design in zemax (fig 2. kohler) (with reverse ray-tracing placing an object at infinity and the LED on the image plane).

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I am trying to design a kohler illumination system in zemax (for a trasmited illumination system) based on the fig 1design.