Ms. Laurie Hill Profile

Laurie Hill

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Proceedings Article | 12 October 2004 Paper

Acceptance testing of a large-aperture dynamic wavefront sensor

David Fischer, Alan Wertheimer, Laurie Hill

Proceedings Volume 5553, (2004) https://doi.org/10.1117/12.559869

KEYWORDS: Wavefronts, Sensors, Mirrors, Calibration, Ferroelectric materials, Wavefront sensors, Optical fabrication, Collimation, Motion measurement, Interference (communication)

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A large aperture dynamic wavefront sensor (WFS) was tested and qualified for use against its design requirements. The WFS was designed to measure the relative slope of dynamic wavefronts; therefore, the test system created dynamic wavefronts, moving at 35 Hz to 315 Hz, with slopes on the order of 50 nanoradians (nR). The essential test system was an f/2.3 parabolic mirror with a laser source at the focal point, offset laterally by a fold mirror. The reflected light was nominally collimated and incident on the WFS at zero degrees. The source hardware was mounted on two crossed-translation stages that could drive a 540 μm, 1/2 Hz trapezoidal motion, inducing tilt in the collimated beam. This 100 microradians (μR) wavefront modulation calibrated the WFS. The fold mirror was mounted on a PZT, which oscillated the fold mirror from 35 Hz to 315 Hz, at tilt angles near 10 μR. This tilt moved the virtual source point, inducing wavefront tilts in the collimated output beam on the order of 100 nR. These fast, very small wavefront tilts were used to test the WFS performance. The test system, procedure, and calibration procedures are described.

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