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Related Concept Videos

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 Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...
IR Spectrometers01:25

IR Spectrometers

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IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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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.
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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.
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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Infrared to visible parametric upconversion.

R F Lucy

    Applied Optics
    |February 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates parametric laser image upconversion in proustite to convert infrared (IR) images to visible light. The system achieved good agreement with theory, showing potential for IR imaging applications.

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    Area of Science:

    • Nonlinear Optics
    • Infrared Imaging
    • Materials Science

    Background:

    • Infrared imaging is crucial for various applications.
    • Proustite is a nonlinear crystal with potential for frequency conversion.
    • Parametric upconversion offers a method to convert IR to visible light.

    Purpose of the Study:

    • To evaluate parametric laser image upconversion using proustite.
    • To measure key system parameters and compare them with theoretical predictions.
    • To assess the feasibility of converting 10.6-micrometer illuminated objects into visible images.

    Main Methods:

    • Illuminating a diffuse scatterplate with a CO2 laser at 10.6 micrometers.
    • Measuring upconversion efficiency, angle of acceptance, tunability, bandwidth, and image resolution.
    • Utilizing a 1-cm-long proustite crystal as the nonlinear mixer.

    Main Results:

    • Upconversion efficiency was 6 x 10(-6) with 44 W/cm(2) local oscillator power density.
    • Angle of acceptance was 8 degrees, and acceptance bandwidth was 0.015 micrometers.
    • Image resolution was measured at 20 mrad/cycle, limited by beam divergence.

    Conclusions:

    • Experimental results align well with theoretical models for proustite upconversion.
    • The study confirms proustite's capability for infrared to visible image conversion.
    • Internal parametric light, identified as upconverted thermal radiation, was observed in the proustite mixer.