Wavefront error measurement technique using extended, incoherent light sources

Physics – Optics

Scientific paper

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Adaptive Optics, Error Analysis, Incoherence, Light (Visible Radiation), Optical Equipment, Wave Fronts, Digital Simulation, Photosphere, Waveforms

Scientific paper

A technique for measuring wavefront errors in an optical system that receives light from a spatially extended, arbitrarily structured, incoherent source is described. If a suitable transparent mask is placed at an image plane of the system, the structure in the light source serves as a tracer for wavefront errors. The slope of the wavefront error can be detected in the form of intensity variations in a pupil image that follows the mask. One-dimensional numerical simulations of the method as well as the analytical treatment of the proposed principle are presented. The application of the technique as a wavefront sensor in an adaptive optical system for solar observations, in which aberrations are caused by atmospheric turbulence in the light path, is discussed as an example.

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