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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...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

High-resolution mid-IR spectrometer based on frequency upconversion.

Qi Hu1, Jeppe Seidelin Dam, Christian Pedersen

  • 1DTU Fotonik, Technical University of Denmark, Roskilde DK-4000, Denmark.

Optics Letters
|December 22, 2012
PubMed
Summary
This summary is machine-generated.

We developed a new high-resolution spectroscopy method using frequency upconversion. This technique enables sensitive, real-time gas analysis without detector cooling, offering broad applications in environmental monitoring.

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Area of Science:

  • Spectroscopy
  • Nonlinear Optics
  • Infrared Technology

Background:

  • Traditional mid-infrared spectroscopy often requires cryogenic cooling for sensitive detection.
  • Frequency upconversion offers a pathway to shift infrared signals to visible or near-visible regions for easier detection.

Purpose of the Study:

  • To demonstrate a novel high-resolution spectroscopy system utilizing frequency upconversion.
  • To enable sensitive, low-noise detection of mid-infrared spectra without detector cooling.

Main Methods:

  • Employed sum-frequency mixing to upconvert mid-infrared light (3 μm) to the near-visible region.
  • Utilized a scanning Fabry-Perot interferometer for postfiltering and high spectral resolution.
  • Integrated a silicon-based CCD camera for direct, low-noise detection.

Main Results:

  • Achieved a spectral resolution of 0.2 nm in the 3 μm spectral range.
  • Successfully detected water vapor emission lines from a butane burner.
  • Demonstrated low-noise detection without the need for detector cooling.

Conclusions:

  • The developed frequency upconversion spectroscopy method provides high resolution and sensitivity.
  • The system is suitable for real-time monitoring of specific gas lines and reference signals.
  • This approach simplifies instrumentation by eliminating the need for cooled detectors.