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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Updated: May 30, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Published on: January 28, 2019

A phase-shift laser scanner based on a time-counting method for high linearity performance.

Heesun Yoon1, Hajun Song, Kyihwan Park

  • 1Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Republic of Korea.

The Review of Scientific Instruments
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel multiple-step phase demodulation method for precise distance measurement using light. The technique enhances robustness against noise and resolves 2π ambiguity issues common in phase-shift measurements.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Signal Processing

Background:

  • Phase-shift measurement is crucial for determining distances by analyzing light's phase difference.
  • Common challenges include electrical noise and 2π ambiguity, especially near multiples of 2π radians.

Purpose of the Study:

  • To propose a robust multiple-step phase demodulation method for accurate phase difference measurement.
  • To address and resolve the 2π ambiguity problem in phase-shift interferometry.

Main Methods:

  • A novel multiple-step phase demodulation technique is introduced.
  • Time counting is integrated for enhanced phase difference measurement.
  • A 180°-shifted reference signal is utilized to resolve phase ambiguity.

Main Results:

  • The proposed method demonstrates increased robustness against electrical noise.
  • The 2π ambiguity problem is effectively resolved using the time-counting approach with a shifted reference signal.
  • Accurate distance measurements are achievable through precise phase difference determination.

Conclusions:

  • The developed multiple-step phase demodulation method offers a reliable solution for phase-shift measurements.
  • This technique improves accuracy and overcomes limitations in challenging noisy environments.
  • It provides a significant advancement for optical distance measurement applications.