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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Short coherence length produced by a spatial incoherent source applied for the Linnik-type interferometer.

I Zeylikovich¹

¹Institute for Ultrafast Spectroscoy and Lasers, Department of Physics, City College and Graduate Center of the City University of New York, New York 10031, USA. zeylikov@sci.ccny.cuny.edu

|April 22, 2008

Summary

Investigating axial resolution in Linnik-type interferometers with spatial incoherent sources reveals that optimal spectral bandwidth and high numerical aperture (NA) objectives degrade resolution at shallow depths.

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Area of Science:

Optical microscopy
Interferometry
Coherence theory

Background:

Axial resolution in interference microscopy is limited by source temporal coherence and objective numerical aperture (NA).
Deep coherence imaging requires understanding illumination source coherence properties (spatial and temporal).

Purpose of the Study:

To theoretically and experimentally investigate axial resolution in Linnik-type interferometers using spatial incoherent sources.
To analyze the impact of source spatial and temporal coherence on axial resolution for potential deep coherence imaging applications.

Main Methods:

Theoretical analysis of axial resolution considering spatial and temporal coherence.
Experimental investigation using a Linnik-type interferometer with a spatial incoherent source.
Evaluation of resolution degradation with varying spectral bandwidth and objective NA.

Main Results:

Axial resolution is influenced by both spatial and temporal coherence of the illumination source.
Using optimal spectral bandwidth and high-NA objectives leads to degraded axial resolution at shallow depths.
The findings are significant for deep coherence imaging applications.

Conclusions:

The study provides a comprehensive understanding of axial resolution limitations in Linnik interferometers under spatial incoherent illumination.
Optimizing spectral bandwidth and NA requires careful consideration to avoid resolution degradation in specific imaging scenarios.
Results offer insights for advancing deep coherence imaging techniques.