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Related Experiment Videos

Space-domain lock-in amplifier based on a liquid-crystal spatial light modulator.

Gregory P Lousberg1, Lars D A Lundeberg, Dmitri L Boiko

  • 1Ecole Polytechnique Fédérale de Lausanne, Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland.

Optics Letters
|April 8, 2006
PubMed
Summary

A novel two-dimensional (2D) spatial lock-in amplifier achieves high contrast for intensity patterns. This optical device measures coherence in laser arrays using spatial modulation.

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Area of Science:

  • Optics and Photonics
  • Coherent Imaging
  • Laser Physics

Background:

  • Spatial lock-in amplifiers are crucial for extracting weak signals from noisy data in various scientific fields.
  • Conventional lock-in amplifiers typically operate in the time domain, limiting their application in parallel spatial measurements.
  • Developing a spatial-domain equivalent is essential for analyzing complex 2D intensity patterns and coherence properties.

Purpose of the Study:

  • To introduce and demonstrate a novel two-dimensional (2D) spatial lock-in amplifier.
  • To achieve high contrast ratios for spatial intensity patterns using readily available components.
  • To validate the device's functionality by measuring the mutual coherence of a 2D laser array.

Main Methods:

  • Implementation of a spatial lock-in amplifier using a liquid-crystal spatial light modulator (LC-SLM).

Related Experiment Videos

  • Utilizing spatial-domain modulation-demodulation techniques under coherent imaging conditions.
  • Employing Young's double-slit interference to probe the mutual coherence of individual emitters in a laser array.

    • Main Results:

    • The 2D spatial lock-in amplifier demonstrated a contrast ratio exceeding 10,000:1 for transmitted and blocked intensity patterns.
    • Successful spatial modulation and demodulation of intensity patterns were achieved.
    • The device effectively measured the mutual coherence between individual emitters within a 2D phase-coupled array of vertical cavity surface-emitting lasers (VCSELs).

    Conclusions:

    • The developed 2D spatial lock-in amplifier offers a robust method for high-contrast spatial intensity pattern analysis.
    • This technique enables precise measurements of spatial coherence in complex optical systems, such as multi-emitter laser arrays.
    • The device's reliance on conventional LC-SLMs suggests potential for widespread adoption in optical metrology and imaging.