| 摘要 |
<p>Disclosed are a holographic optical element (HOE) and a method of producing the HOE. In one embodiment of the method, a substrate is provided which is capable of recording a hologram or diffraction gratings. This substrate is illuminated with a first pair of light beams and a second pair of light beams. The first pair of light beams intersect within the substrate. The second pair of light beams also intersect within the substrate. Additionally, the first pair of light beams intersect at a region within the substrate where the second pair of light beams intersect. Normally, each of the first pair of light beams comprises light of a first wavelength, and each of the second pair of light beams comprises light of a second wavelength, where the first wavelength is different from the second wavelength.</p> |
