| 摘要 |
A retroreflector comprising two hemispheres of differing radii. The spherical surface of the first hemisphere is disposed towards a radiation source and the second hemisphere is provided with a reflective coating on its spherical surface. Means for modulating radiation from the retroreflector can be utilized within the retroreflector. In addition, smaller concentric inner hemispheres or a concentric inner sphere may be provided to correct chromatic and spherical aberrations produced by the retroreflector. Advantages obtainable with the disclosed retroreflector include consistent return efficiency over a large field of regard and consistent return efficiency over a wide spectral region.
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