| 摘要 |
<p>A diffractive optical element for use with first, second and third wavelengths, includes a substrate (10) having opposing first and second surface, a first diffractive element (12) on the first surface of the substrate, the first diffractive element for diffracting the first wavelength and substantially passing the third wavelength, and a second diffractive element (14, 314) on the second surface of a substrate, the second diffractive element for diffracting the second wavelength and substantially passing the third wavelength.</p> |
