Diffractive pyramid wave-front sensor used for adaptive optics

Zhao, Yuan; Ding, Xiaona; Wang, Kun; Wei, Hongyan; Yang, Huan; Cai, Dongmei

doi:10.1117/12.977622

Cited by 1 publication

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“…The sharp edges will also ease the design of the optics around the pyramid since faster focal ratios can be used without unacceptable loss of light in the image placed on the pyramid tip. The diffraction efficiency from the stepped sides is theoretically greater than 99.99% alleviating another concern with this approach 5 .…”

Section: Diffractive Pyramidsmentioning

confidence: 99%

Lithographic manufacturing of adaptive optics components

Scott

Jean

Johnson

et al. 2017

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems

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Adaptive optics systems and their laboratory test environments call for a number of unusual optical components. Examples include lenslet arrays, pyramids, and Kolmogorov phase screens. Because of their specialized application, the availability of these parts is generally limited, with high cost and long lead time, which can also significantly drive optical system design. These concerns can be alleviated by a fast and inexpensive method of optical fabrication. To that end, we are exploring direct-write lithographic techniques to manufacture three different custom elements. We report results from a number of prototype devices including 1, 2, and 3 wave Multiple Order Diffractive (MOD) lenslet arrays with 0.75 mm pitch and phase screens with near Kolmogorov structure functions with a Fried length r 0 around 1 mm. We also discuss plans to expand our research to include a diffractive pyramid that is smaller, lighter, and more easily manufactured than glass versions presently used in pyramid wavefront sensors. We describe how these components can be produced within the limited dynamic range of the lithographic process, and with a rapid prototyping and manufacturing cycle. We discuss exploratory manufacturing methods, including replication, and potential observing techniques enabled by the ready availability of custom components.

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Section: Diffractive Pyramidsmentioning

confidence: 99%