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Related Concept Videos

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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Related Experiment Video

Updated: May 8, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Note: continuous-wave time-of-flight laser scanner using two laser diodes to avoid 2π ambiguity.

Sungui Hwang1, Junhwan Jang, Kyihwan Park

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

The Review of Scientific Instruments
|September 7, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method using dual laser diodes with varying frequencies to overcome the 2π ambiguity in continuous-wave time-of-flight distance measurements, enabling precise long-range sensing.

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Published on: July 17, 2016

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Last Updated: May 8, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

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Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope
12:54

Implementation of a Coherent Anti-Stokes Raman Scattering (CARS) System on a Ti:Sapphire and OPO Laser Based Standard Laser Scanning Microscope

Published on: July 17, 2016

Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science

Background:

  • Continuous-wave time-of-flight (CW-ToF) methods measure distance using light's phase difference.
  • A key limitation is the 2π phase ambiguity, restricting unambiguous measurement to shorter distances.

Purpose of the Study:

  • To address the 2π phase ambiguity in CW-ToF distance measurements.
  • To enhance distance resolution for longer measurement ranges.

Main Methods:

  • Simultaneous application of low- and high-frequency signals to two separate laser diodes.
  • Utilizing distinct signal processing circuits for each laser diode's signal.
  • Phase difference analysis to resolve ambiguity and determine distance.

Main Results:

  • Successfully resolved the 2π phase ambiguity inherent in CW-ToF systems.
  • Achieved high distance resolution over extended measurement ranges.
  • Demonstrated the effectiveness of the dual-frequency approach.

Conclusions:

  • The proposed dual-frequency laser diode method effectively overcomes CW-ToF limitations.
  • This technique offers a viable solution for precise long-distance metrology.