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[Goptical] focal spot size

From: Gregory Vieux
Subject: [Goptical] focal spot size
Date: Wed, 03 Apr 2013 13:02:40 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130308 Thunderbird/17.0.4


I am wondering if there is a way, using spot analysis, to get the focal spot size as defined for a Gaussian beam. My system is defined by a point source at infinity, a 3 mm radius aperture and a f=250 mm plano-convex lens. When using get_max_radius() or get_rms_radius() I obtain results of the order of 3 um, which is not possible considering Gaussian optics. Moreover, when reducing the aperture size, the focal spot size is decreasing when it should be increasing. I am wondering if the problem is coming from defining the source as a point source.

Any advice is welcome.


Gregory Vieux

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