METHOD AND DEVICE FOR THE LAYERED PRODUCTION OF THIN VOLUME GRID STACKS, AND BEAM COMBINER FOR A HOLOGRAPHIC DISPLAY

摘要

The invention relates to a method and to a device for the layered production of at least one volume grid (VG) in a recording medium (AZM) by exposure to light, which comprises at least one light sensitive layer which is sensitized for a predeterminable wavelength (?) of the exposure light. Each volume grid (VG) is generated in the recording medium (AZM) by at least two interference capable wave fronts (WF1, WF2) of coherent light, which are superimposed at a predeterminable depth (z) at a predeterminable angle (2?) in the recording medium (AZM) with a predeterminable interference contrast V(z). The depth (z) and the thickness of the refractive index and/or transparency modulation of a volume grid (VG) in the recording medium (AZM) are adjusted in the direction of light propagation (z) by a depth dependent control of the spatial and/or temporal coherence degree (?) of the interfering wave fronts (WF1, WF2). The invention further relates to a beam combiner for a holographic display and to a solar module having increased efficiency.