April 2008

Testing Aspheres

Christof Pruss, Eugenio Garbusi and Wolfgang Osten

Optical designers are working to develop approaches for aspheric metrology that combine accuracy with flexibility. This article addresses current developments and reviews the state of the art in testing with computer-generated holography.


Optical Signal Processing Based on All-Optical Analog-to-Digital Conversion

The nonlinearity of optical fiber provides attractive functionalities for all-optical signal processing. Recently, researchers have extensively studied all-optical analog-to-digital and digital-to-analog converters in an effort to surpass the inherently limited operating speed of these devices’ electronic counterparts.

Retinal Transplants: Hope to Preserve and Restore Vision

Transplantation of retinal progenitor cell layers may be a viable treatment for devastating eye diseases such as retinitis pigmentosa and macular degeneration. In several studies of animals with retinal degeneration, transplants of intact sheets of immature retinal cells improved vision—a finding that was validated in recent clinical research in humans. However, data from more patients are needed to confirm this as a valid therapy.


Bionic Eyes for Daily Wear?

A Teeny, Tiny Spectrometer

Did You Know?

Court-Based Patent Reform

OPN Talks with Ian Walmsley

Active Learning in Optics and Photonics

Membership Directories and JOSA Indexing


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