Risley Prisms Alignment



Hi:

There is a ray coming at angle (~ 3 mrad) twoards an axis (Optics
Axis), we'd like to bend this ray so that lies right
on the Optics Axis. With a Risley Prisms Pair we can make the ray
coming out of the Risleys parallel to the
Optics Axis but the ray dose not coencide with Optics Axis and because
of the Risleys it has an offset from it.

Is there a way to get rid of this offset without using a window (a
piece of glass with parallel faces)
as a beam shifter after the Risleys?

Can adding another prism (a Risley wedge) and adjusting the spacings
between these wedges work? I tried this
in ZEMAX but still couldn't get rid of the output ray offset.


Appreciate your suggestions.
.

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