The APP optics

Photograph of the Apodising Phase Plate (APP) optics just before the unit was put into the NACO instrument. The APP appears bright yellow in the centre of this image, but is very transparent in the infrared. Precise variations in its thickness create phase variations that transform the waves of light in the required way, somewhat like the way waves on the ocean surface can bend sunlight to form caustic patterns on the sandy bottom.

Credit:

Rainer Lenzen (MPIA)/ESO

About the Image

Id:ann1037b
Type:Photographic
Release date:1 July 2010, 10:10
Related announcements:ann1037
Size:2000 x 1467 px

About the Object

Name:NACO
Type:Unspecified : Technology : Observatory : Instrument
Category:Paranal

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