Illumination Spot Size Calculator

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Description

Determine the illuminated spot size resulting from a collimated light source passing through a singlet based on the input beam diameter, the lens focal length, and the propagation distance. Calculator assumes a thin lens and uses the paraxial approximation. The calculator works for three possible scenarios: f > 0 and the propagation distance > f, f > 0 and the propagation distance < f, and f < 0. The larger the difference between propagation distance and focal length the greater the spot size will be.

Spot Size	Represents the resulting geometrical spot size after the beam has exited the lens
d_b	Represents the diameter of the beam that enters the lens (units are in mm)

Illumination Spot Size Calculator

Notes:

Description

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