I think in the file you saw, paraxial lens was there to simplfiy the design at the very early stage; just to have some idea about what sort of lens power is required to collimate. In reality, you will need to substitute the real lens later on. M&K'5G)7
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For your second question, you shall check your light source illumination angle and see if majority of the rays hitting at the surface is beyond the critical angle. You may also zoom in the layout to see if some rays do emerge from this surface/lens cos in ZEMAX, if there is no objects ahead of the direction where the rays are travelling to then ZEMAX will normally terminate the ray tracing. =P<7tsSuoK
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Not usre of the lens or the surface has any coating assigned, if so, you better tick the option of "Use Polarization" and "Split Ray" in order to see some effects that are only accounted under polarization analysis. *4F6U
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"Splt" means having the ray split at interfaces between materials of different index and Upol implies use polarization. You will need to use both settings if rays are partially reflected and transmitted. JN-wToOF
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When rays are split at an interface into reflected and trasmitted parts, these parts are referred as Segments so it depends on which segments you wish to look at and you may specifiy under seg# field. dat# refers to different data returned, you should check against the user manual for details as there are plenty information. However, you should be aware that NSRA only trace one single ray. To optimize you will need to use NSTR. For illumination wise you will probably find the returned data from the detetctor using NSDD more useful. Under NSDD you could set Pix# = -4 and Data = 1 in order to achieve collimation. h48
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My apologies, from my end it is easier to type English instead.
