FQPM_FFT_aligner¶
-
class
poppy.
FQPM_FFT_aligner
(name='FQPM FFT aligner', direction='forward', **kwargs)[source]¶ Bases:
poppy.optics.AnalyticOpticalElement
Helper class for modeling FQPMs accurately
Adds (or removes) a slight wavelength- and pixel-scale-dependent tilt to a pupil wavefront, to ensure the correct alignment of the image plane FFT’ed PSF with the desired quad pixel alignment for the FQPM.
This is purely a computational convenience tool to work around the pixel coordinate restrictions imposed by the FFT algorithm, not a representation of any physical optic.
- direction : string
- ‘forward’ or ‘backward’
Methods Summary
get_opd
(wave)Compute the required tilt needed to get the PSF centered on the corner between the 4 central pixels, not on the central pixel itself. Methods Documentation