| 摘要 |
<p>An imaging system (100) is provided that includes a primary mirror (1), secondary mirror (2), tertiary mirror (3) and quaternary mirror (4) arranged in a single-axis, double-pass, four reflection format. The quaternary mirror (4) is an aspheric reflecting element. The quaternary mirror (4) may be substantially planar and the primary, secondary and tertiary mirrors (1, 2, 3) may be arranged in a Cassegrain-like format.</p> |
