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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

Low-coherence interferometry with synthesis of coherence function.

Y Teramura¹, K Suzuki, M Suzuki

¹Department of Electrical Engineering, Faculty of Science and Technology, Keio University 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522 Japan.

|March 8, 2008

Summary

Researchers synthesized coherence functions using spectral phase manipulation of low-coherent light. This technique enables novel optical low-coherence reflectometry without mechanical scanning, advancing interferometry applications.

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Area of Science:

Optics and Photonics
Interferometry
Coherence Theory

Background:

Low-coherent light is crucial for optical metrology.
Controlling the coherence function is key for advanced applications.
Existing methods often require mechanical scanning, limiting speed and precision.

Purpose of the Study:

To synthesize coherence functions by manipulating the spectral phase of low-coherent light.
To apply this synthesis technique to develop a novel optical low-coherence reflectometry system.
To investigate the effects of space-time coupling and dispersion on coherence function synthesis.

Main Methods:

Utilized a segmented liquid-crystal phase modulator to manipulate spectral phase.
Employed phase-only masks designed via simulated annealing optimization.
Theoretically and experimentally verified effects of diffractive gratings and spatial light modulator dispersion.
Developed a novel optical low-coherence reflectometry system based on the synthesized coherence function.

Main Results:

Successfully synthesized various coherence functions by controlling spectral phase.
Demonstrated that space-time coupling and second-order dispersion impact coherence synthesis.
Developed a mechanical-free optical low-coherence reflectometry system.
Achieved precise optical delay scanning through coherence function manipulation.

Conclusions:

Spectral phase manipulation offers a powerful method for synthesizing coherence functions.
The developed technique enables advanced low-coherence interferometry applications, such as mechanical-free reflectometry.
This approach overcomes limitations of traditional scanning methods, paving the way for faster and more precise optical measurements.