Low light level quadriwave lateral shearing interferometer for in-situ wavefront sensing

Brian Catanzaro; Benoit Wattellier; Ekaterina Boldyreva; Eliot Young; Michael Lewis; Jeffrey Juergens; Robert Woodruff; Monica Hoffmann

doi:10.1117/12.2312331

11 July 2018 Low light level quadriwave lateral shearing interferometer for in-situ wavefront sensing

Brian Catanzaro, Benoit Wattellier, Ekaterina Boldyreva, Eliot Young, Michael Lewis, Jeffrey Juergens, Robert Woodruff, Monica Hoffmann

Author Affiliations +

Proceedings Volume 10703, Adaptive Optics Systems VI; 107035J (2018) https://doi.org/10.1117/12.2312331
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The environment of a balloon based telescope puts opto-mechanical stability demands that wavefront sensing and focus control are important features to consider. The GHAPS telescope is designed to correct for rigid body motion of the secondary mirror based upon wavefront sensing from reference stars. In order to support the concept of operations of this approach, the precision of wavefront sensing with candidate reference stars needs to be addressed. Precision is expected to degrade with reduction in irradiance. To confirm this, a study was conducted to determine the relationship between broadband and narrow spectral irradiance and wavefront measurement precision. The results of the study demonstrate that a precision of 5 nm RMS can be achieved with a 20 x 20 sampling of the wavefront with an irradiance of a visual magnitude 5 star on 1 meter aperture with an exposure of 30 msec.

Citation Download Citation

Brian Catanzaro, Benoit Wattellier, Ekaterina Boldyreva, Eliot Young, Michael Lewis, Jeffrey Juergens, Robert Woodruff, and Monica Hoffmann "Low light level quadriwave lateral shearing interferometer for in-situ wavefront sensing", Proc. SPIE 10703, Adaptive Optics Systems VI, 107035J (11 July 2018); https://doi.org/10.1117/12.2312331

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