Achromatic phase elements based on a combination of surface and volume diffractive gratings
2015
Phase masks are important optical elements that have been utilized for several decades in a large variety of
applications. Recently, we demonstrated a new type of phase masks fabricated by encoding phase profiles into volume
Bragg gratings, allowing these holographic elements to be used as phase masks at any wavelength capable of satisfying
the Bragg condition of the hologram. Here, we present a new method of true achromatization of this type of phase masks
that removes the need for angle tuning and is implemented by combining this holographic phase masks approach with a
pair of surface diffraction gratings.
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