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Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

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Published on: February 8, 2014

Digitally enhanced homodyne interferometry.

Andrew J Sutton1, Oliver Gerberding, Gerhard Heinzel

  • 1Centre for Gravitational Physics, Department of Quantum Science, The Australian National University, Canberra, ACT 0200, Australia. andrew.sutton@anu.edu.au

Optics Express
|October 6, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel interferometry technique for sensitive, simultaneous multi-target measurement. The advanced signal processing reduces complexity and achieves record low noise floors for this measurement style.

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Area of Science:

  • Optical physics
  • Metrology
  • Instrumentation

Background:

  • Interferometry is crucial for precise measurements.
  • Existing techniques often face limitations in sensitivity, complexity, or simultaneous multi-target capabilities.

Purpose of the Study:

  • To develop and present two novel variations of an interferometry technique.
  • To achieve high sensitivity and simultaneous measurement of multiple targets.
  • To reduce the complexity and electro-optic footprint compared to existing methods.

Main Methods:

  • Homodyne phase measurement using a four-point phase-shifting algorithm.
  • Pseudo-random switching for multiplexed measurements based on propagation delay.
  • Two variants: one with a dedicated reference field, another without.

Main Results:

  • Achieved a displacement noise floor of 0.8 pm/√Hz above 50 Hz with the first variant.
  • Achieved a displacement noise floor of 1 pm/√Hz down to 20 Hz with the second variant (no dedicated reference).
  • Demonstrated significant complexity reduction through advanced signal processing.

Conclusions:

  • The novel interferometry technique offers high sensitivity and multiplexing capabilities.
  • The second variant provides further simplification and improved low-frequency performance.
  • Represents a significant advancement in sensitive interferometry with a reduced footprint.