Btukfyl

Having looked through the pst-optexp manual, it doesn't seem that there is a built-in off-axis parabolic mirror. I'm trying to make a diagram of a lab setup that goes like this:

1. Collimated beam falls on a converging lens.




2. The focal point of the lens is at the same point as the focal point of the OAP.




3. OAP reflects a collimated beam at a 90 degree angle to the incident beam.

Version 5.1 of pst-optexp contains an off-axis parabolic mirror as oapmirror. You must specify three nodes to align the mirror properly: the input nodes, the center node, where the actual mirror center is placed, and the focal point.

Here is an example for a mirror which reflects by 90°:

documentclass[margin=5pt, pstricks]{standalone}

usepackage{pst-optexp}

begin{document}

begin{pspicture}(5,4)

  pnodes(5,0.5){In}(1,0.5){C}(1,2){Focus}(1,4){Out}

  addtopsstyle{Beam}{fillstyle=solid,fillcolor=green!40!white}

  begin{optexp}

    oapmirror(In)(C)(Focus)

    lens[n=1.53](Focus)(Out)

    drawwidebeam[beamwidth=0.5](In){-}(Out)

    drawbeam[ArrowInside=->, ArrowInsidePos=0.2, arrowscale=3, arrowinset=0.3, linestyle=none](In){1}

  end{optexp}

  psdot(Focus)uput[0](Focus){focus}

end{pspicture}

end{document}

is there a bug related to oapmirror? I've been trying to draw one in my experimental setup sketch without success. In fact, I tried to compile the code from Christoph and it didn't work.