Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A Comparative Effectiveness Study of Bipolar and Linked Quadripolar Techniques for Eliciting Transcranial Motor Evoked Potentials.

The Neurodiagnostic journal·2026
Same author

Randomized Phase I/II Clinical Trial of a Melanoma Helper Peptide Vaccine with or without Systemic Agonistic Anti-CD27 Antibody (Varlilumab).

Cancer research communications·2026
Same author

Phase I/II clinical trial of a melanoma vaccine targeting shared non-mutated antigens and a shared mutated BRAF neoantigen with an agonistic CD40 antibody (CDX-1140) plus TLR3 agonist (poly-ICLC).

Journal for immunotherapy of cancer·2026
Same author

Management of direct oral anticoagulants in percutaneous coronary and structural interventions.

Kardiologia polska·2026
Same author

Deep generative computed perfusion-deficit mapping of ischaemic stroke.

Communications biology·2026
Same author

The role of aetiology in determining anticoagulation effectiveness for the treatment of left ventricular thrombus.

European heart journal. Cardiovascular pharmacotherapy·2025
Same journal

Multifunctional reconfigurable terahertz metasurface based on vanadium dioxide phase transition: achieving broadband absorption and efficient polarization conversion.

Applied optics·2026
Same journal

High-Q-factor electromagnetically induced transparency utilizing quasi-bound states in the continuum in an all-dielectric terahertz metasurface.

Applied optics·2026
Same journal

Automated stitching interferometry for high-precision metrology of X-ray mirrors.

Applied optics·2026
Same journal

Experimental demonstration of an approach to designing a metal-dielectric DBR resonant cavity structure.

Applied optics·2026
Same journal

High-precision wavefront reconstruction from a single-shot interferogram using a physics-driven hybrid feature calibration network.

Applied optics·2026
Same journal

Ultra-high-Q Fano resonance based on coupled topological corner states in Kagome photonic crystals.

Applied optics·2026
See all related articles

Related Experiment Video

Updated: May 16, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical

Solon Karagiannopoulos1, Edward Cheadle, Paul Wright

  • 1School of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, UK. solon.karagiannopoulos@postgrad.manchester.ac.uk

Applied Optics
|December 5, 2012
PubMed
Summary
This summary is machine-generated.

A new opto-electronic system uses direct absorption spectroscopy (DAS) with semiconductor optical amplifiers (SOAs) for Near-IR gas sensing. This novel approach enables accurate H2O measurement for engine imaging.

More Related Videos

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
07:55

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

Published on: September 22, 2017

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Related Experiment Videos

Last Updated: May 16, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
07:55

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

Published on: September 22, 2017

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Area of Science:

  • Opto-electronics
  • Spectroscopy
  • Optical Engineering

Background:

  • Direct absorption spectroscopy (DAS) is a common technique for gas concentration measurement.
  • High temporal resolution imaging of gas species, such as H2O in internal combustion engines, requires advanced sensing methods.
  • Existing methods may face limitations in speed, multiplexing capabilities, or applicability to harsh environments.

Purpose of the Study:

  • To report a novel opto-electronic scheme for line-of-sight Near-IR gas absorption measurement.
  • To design a diode-laser-based, multiwavelength system for nonintrusive, high temporal resolution tomographic imaging of H2O.
  • To demonstrate the use of semiconductor optical amplifiers (SOAs) for modulation and switching in spectroscopy.

Main Methods:

  • Implementation of DAS using semiconductor optical amplifiers (SOAs) for wavelength multiplexing and intensity modulation.
  • Selection of two Near-IR overtone water transitions for ratiometric temperature compensation and concentration measurements.
  • Inclusion of an additional wavelength for accounting nonabsorbing attenuation.
  • Evaluation using a wavelength scanning approach for absorption line recovery and demonstration of fixed-wavelength, time-division-multiplexing operation.

Main Results:

  • Excellent absorption line recovery was achieved using the wavelength scanning approach.
  • Successful demonstration of fixed-wavelength, time-division-multiplexing operation with SOAs.
  • Validation of SOAs for modulation and switching in a spectroscopic application, a first of its kind.
  • The scheme allows for ratiometric temperature compensation and measurement of H2O concentration.

Conclusions:

  • The developed opto-electronic scheme offers a novel and effective method for Near-IR gas absorption measurement.
  • The use of SOAs provides wavelength multiplexing and modulation capabilities, enabling high-performance spectroscopic applications.
  • This system is suitable for nonintrusive, high temporal resolution imaging of H2O in internal combustion engines.
  • The scheme's adaptability allows for the measurement of other chemical species with appropriate diode laser selection.