An Off-Axis Parabolic (OAP) mirror is a segment taken from a larger parent parabolic surface, offset from its central axis. This unique design enables its core function: to focus incident collimated light onto a single point without aberration, or to collimate light from a point source into a perfect beam, with all light deviating from the parent parabola's mechanical axis.
Aberration-free focusing/collimating: For monochromatic light, the oap is the only element that provides perfect focusing free from spherical aberration, coma, and astigmatism.
Unobstructed optical path: Its most significant practical advantage.
Chromatic aberration-free: Operates perfectly across an extremely broad spectrum, from deep ultraviolet to far infrared.
| Surface Flatness | λ/4 @ 633 nm |
| Roughness | < 100 Å |
| Dimension Tolerance | 0/-0.2mm |
| Reflective Coating | Aluminum, Silver, Gold |
| Surface Quality | 40-20 |
