Multiplex techniques for real-time shearing interferometry

Bruce A. Horwitz

doi:10.1117/12.55719

1 October 1990 Multiplex techniques for real-time shearing interferometry

Bruce A. Horwitz

Author Affiliations +

Optical Engineering, Vol. 29, Issue 10, (October 1990). https://doi.org/10.1117/12.55719

Abstract

Real-time wavefront sensors can be viewed as processing channels that convert a continuous, two-dimensional wavefront phase variation into a parallel array of sampled wavefront values. In general, two pieces of data are required for each wavefront sample: the x gradient and the y gradient. We achieve efficient use of the electro-optical portion of this channel through optical multiplexing techniques that combine the x and y data into one signal. Time multiplexing, temporal frequency multiplexing, and spatial frequency multiplexing have each been implemented successfully in high performance, grating-based, shearing interferometers. The two frequency multiplexing techniques are examined in this paper. A 1000 point wavefront sensor is described as an example of spatial frequency multiplexing, and a typical design is used as the example of temporal frequency multiplexing. Performance of multiplexed sensors is not sacrificed, as demonstrated by the nearly 1000:1 dynamic range (total tilt:rms error) of the latter type of sensor.

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Bruce A. Horwitz "Multiplex techniques for real-time shearing interferometry," Optical Engineering 29(10), (1 October 1990). https://doi.org/10.1117/12.55719

Published: 1 October 1990

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