Gemini Observatory Press Releases

Adaptive Optics - Straightening Out Bent Starlight


AO Schematic Illustration

Medium-res JPEG (206KB)
To view a fully animated Quick-TimeTM movie of this schematic, click here (13MB).

A schematic of how an adaptive optics systems, like Altair on Gemini North, works to correct distorted starlight. The illustration (1) is an example of a blurry image taken without the help of adaptive optics. When starlight is collected and focused by the telescope, just prior to coming to a focus, the light entering an adaptive optics system is first collimated (2) and is reflected off a deformable mirror (3). After reflecting off the deformable mirror, the light passes through a beam-splitter (4) where the shorter wavelength light (optical) enters the wavefront sensor (5) which takes a "snapshot" of the distortions on the wavefront and sends the information via a computer (6) to the deformable mirror to keep the wavefronts corrected and flat. Finally, the light is focused (7) and imaged on a detector (8) for astronomers to study.

Return to the AO background information.