![]() Holographic Versatile Disc structure 1. Green writing/reading
laser (532 nm) 2. Red positioning/addressing laser (650 nm) 3. Hologram (data)(shown here as brown) 4. Polycarbonate layer 5. Photopolymeric layer (data-containing layer) 6. Distance layers 7. Dichroic layer (reflecting green light) 8. Aluminium reflective layer (reflecting red light) 9. Transparent base P. Pit pattern (Illustration is not to scale.) http://en.wikipedia.org/wiki/Holographic_Versatile_Disc |