A hierarchical phasing algorithm for multi–element optical interferometers

A hierarchical phasing algorithm for multi–element optical interferometers

Large multi–aperture interferometers are expected to provide snap–shot images with milli– to nano– arcsecond resolution, directly at the combined focus. This requires a densified exit pupil and phased beams for all the wavelengths used. The wave analysis methods serving for adaptive optics in monolithic telescopes being inadequate for diluted apertures, we have developed a different phasing alg...

A Minimum-Entropy Algorithm for Surface Phasing Problems

Methods of determining the phases for noisy and incomplete surface diffraction data (X-ray or transmission electron) are investigated. It is found that, while conventional methods do not always work, a minimumentropy method that uses the relative entropy is more effective in finding the correct solutions.

Optical Fiber Interferometers and Their Applications

Interference as a wave characteristic of the electromagnetic wave has many applications in science, technology and medicine (Grattan & Meggit, 1997; Wang et al., 2011). The fringe visibility of the first order interference experiments such as the famous double slit Young experiment and Michelson interferometer, is determined by the first order correlation function (Gerry & Knight, 2005). The fi...

Optical Torques in Suspended Fabry-Perot Interferometers

High-power Fabry-Perot cavities with suspended mirrors are employed in gravitational wave detection. The mirrors in such interferometers are subject to forces and torques that are exerted by light pressure. This article derives a closed-form expression for the static torsional stiffness due to this effect. The torsional stiffness is shown to scale as the fourth power of the beam spot size. In p...

Quantum Optical Noise in Advanced LIGO Interferometers