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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

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Related Experiment Video

Updated: May 26, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
09:38

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Continuous-wave terahertz phase imaging using a far-infrared laser interferometer.

Yingxin Wang1, Ziran Zhao, Zhiqiang Chen

  • 1Department of Physics, Tsinghua University, Beijing, 100084, China. wangyingxin2000@tsinghua.org.cn

Applied Optics
|December 24, 2011
PubMed
Summary
This summary is machine-generated.

Terahertz phase imaging reveals object depth and enhances contrast for materials. This continuous-wave interferometric method uses a laser interferometer and phase-shifting algorithm for accurate 3D imaging.

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Area of Science:

  • Optics and Photonics
  • Terahertz Science and Technology
  • Imaging Techniques

Background:

  • Terahertz (THz) phase imaging offers depth information for optically opaque objects.
  • It provides superior contrast for materials with low absorption.
  • Accurate phase retrieval is crucial for quantitative imaging.

Purpose of the Study:

  • To demonstrate a continuous-wave terahertz interferometric imaging method.
  • To achieve diffraction-limited lateral and subwavelength axial resolution.
  • To accurately reconstruct phase images of transparent samples.

Main Methods:

  • Utilized a far-infrared laser interferometer for THz phase measurement.
  • Implemented an improved four-step phase-shifting algorithm for high-accuracy phase retrieval.
  • Applied the method to extract relative depth profiles of transparent samples.

Main Results:

  • Achieved diffraction-limited lateral resolution and subwavelength axial resolution.
  • Successfully retrieved phase maps with high accuracy and low distortion.
  • Demonstrated effective reconstruction of object phase images.

Conclusions:

  • Terahertz interferometric imaging is effective for quantitative phase imaging.
  • The phase-shifting technique enhances accuracy and reduces distortion in THz imaging.
  • This method enables detailed 3D reconstruction of transparent objects.