[Geoff Ludbrook]

Jack

I used to make holographic diffraction gratings for use in the X ray region back in the early 1980s when the technique

was in its infancy. Interference patterns from re-combined laser beams were recorded in photo-resist spun-coated on

a plane or concave substrate. The angle of re-combination of the two beams defined the groove spacing and the groove profile 

could be laminar or blazed depending on the recording geometry. The recorded profile was then ion – etched into the

substrate to form an X-ray resistant grating.

I can send more detail f you are interested

Geoff Ludbrook

[Author]

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