Diffraction gratings

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  • #573862
    Jack Martin
    Participant

    How are they manufactured, and how is the process different for reflection and transmission gratings?

    Regards,

    Jack

    Essex UK

    #578615
    Robin Leadbeater
    Participant

    Hi Jack,

    There are various manufacturing techniques, either mechanically ruling the lines to produce a master. (The gratings you can buy are then cast replicas reproduced from the master) or generating them photographically using holography.  The free Richardson “diffraction grating handbook” is a good reference

    http://www.gratinglab.com/Information/Handbook/Handbook.aspx

    (they will send you a hardback copy or a google search thows up an (unofficial) on line pdf version for edition 6)

    though it does not cover volume phase gratings for example where the “grooves” are actually variations in refractive index in the material, again produced using photography and holography

    https://www.noao.edu/noao/noaonews/jun98/node4.html

    Robin

    #578625
    Geoff Ludbrook
    Participant

    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

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