G02B6/0013- Means for improving the coupling-in of light from the light source into the light guide.couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form G02B6/0011- Light guides Structural details of arrangements comprising light guides and other optical elements, e.g.couplings specially adapted for lighting devices or systems G02B6/0001- Light guides Structural details of arrangements comprising light guides and other optical elements, e.g.G02B6/00- Light guides Structural details of arrangements comprising light guides and other optical elements, e.g.transforming one polarisation state into another G02B27/286- Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g.G02B27/283- Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining.G02B27/28- Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising.G02B27/141- Beam splitting or combining systems operating by reflection only using dichroic mirrors.
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