Abstract
The contribution of high order Zernike modes on average phase gradient is investigated. The resulting temporal power spectra are compared to data collected using the tip/tilt servo at the Sydney University Stellar Interferometer (SUSI). The low frequency part of the power spectrum follows a − 2 3 power law which is in agreement with other similar work. Due to the effect of higher order terms, the high frequency power law for average phase gradient becomes − 11 3 rather than the − 17 3 predicted for the ‘tilt’ component of the Zernike representation of the wavefront.
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