Journal ArticleDOI
Phase-shifting (Sagnac) interferometer with external phase control.
José A. Ferrari,Eugenio Garbusi +1 more
TLDR
A novel ring configuration for phase-shifting interferometry with external phase-Shifting control is presented, in which the reference and test arms are parts of the same collimated beam.Abstract:
A novel ring configuration for phase-shifting interferometry with external phase-shifting control is presented. The device is a polarization (ring) interferometer, in which the reference and test arms are parts of the same collimated beam. The key point is to manage the polarization of the light such that orthogonal linear polarizations describe counterpropagating paths in the ring interferometer. The phase shift between the two waves is externally controlled with a Pockels cell, which permits fast phase modulation without the need for moving parts inside the interferometer.read more
Citations
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Journal Article
Digital wavefront measuring interferometer for testing optical surfaces and lenses
TL;DR: In this article, a self-scanned 1024 element photodiode array and a minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100.
Journal ArticleDOI
Optical Fourier techniques for medical image processing and phase contrast imaging
TL;DR: Improvement of microcalcifications in a mammogram for early diagnosis of breast cancer is the main focus and the intensity dependent refractive index can be exploited as a phase filter for phase contrast imaging with a coherent source.
Journal ArticleDOI
Edge enhancement and image equalization by unsharp masking using self-adaptive photochromic filters.
TL;DR: A new method for real-time edge enhancement and image equalization using photochromic filters is presented, using the reversible self-adaptive capacity of photo chromic materials for creating an unsharp mask of the original image.
Journal ArticleDOI
Polarization phase-shifting Fizeau interferometer with a cyclic path optical configuration
Sanjib Chatterjee,Y. Pavan Kumar +1 more
TL;DR: In this article, a cyclic path optical configuration was used to generate coherent, virtual point sources at the back focal plane of a corrected telescope objective for producing a pair of mutually tilted collimated beams with linear orthogonal polarizations in a Fizeau interferometer cavity.
Journal ArticleDOI
Measurement of the surface profile of a curved optical surface with rotation phase-shifting lateral shear cyclic path optical configuration.
Sanjib Chatterjee,Y. Pavan Kumar +1 more
TL;DR: In this article, phase shifts between the laterally sheared emergent beam components of a cyclic path optical configuration are introduced by applying a small change in the angle of incidence of the incident beam due to the small angular rotation of the setup.
References
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Journal Article
Digital wavefront measuring interferometer for testing optical surfaces and lenses
TL;DR: In this article, a self-scanned 1024 element photodiode array and a minicomputer are used to measure the phase (wavefront) in the interference pattern of an interferometer to lambda/100.
Journal ArticleDOI
Digital Wavefront Measuring Interferometer for Testing Optical Surfaces and Lenses
TL;DR: The system has been designed to optimize the collection of data to give higher than usual accuracy in measuring the individual elements and final performance of assembled diffraction limited optical systems, and furthermore, the short loop time of a few minutes makes the system an attractive alternative to constraints imposed by test glasses in the optical shop.
Journal ArticleDOI
Digital wave-front measuring interferometry: some systematic error sources.
TL;DR: To study the occurrence of wave-front irregularities caused by dust particles a model has been developed and countermeasures derived which assure sufficient regularity of contour line plots, and the repeatability of the present experimental setup was better than λ/200 within the 3σ limits.
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Sanjib Chatterjee,Y. Pavan Kumar +1 more