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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

2.1K
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...
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IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

1.8K
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...
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IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

1.2K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.2K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

4.5K
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...
4.5K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.3K
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...
1.3K
IR Spectrum01:19

IR Spectrum

1.9K
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.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Mid-infrared frequency comb with 6.7 W average power based on difference frequency generation.

Anthony Catanese, Jay Rutledge, Myles C Silfies

    Optics Letters
    |February 29, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We developed a high-power mid-infrared frequency comb. This advanced laser source offers excellent beam quality and phase stability, enabling new applications in spectroscopy and materials science.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Quantum Optics

    Background:

    • Frequency combs are precise laser sources essential for metrology and spectroscopy.
    • Generating high-power mid-infrared (mid-IR) light remains a challenge for many applications.
    • Existing mid-IR sources often lack the necessary power or stability for advanced research.

    Purpose of the Study:

    • To develop a high-power, stable mid-infrared frequency comb.
    • To achieve high average output powers in the mid-IR region.
    • To create a versatile platform for generating combs across various spectral ranges.

    Main Methods:

    • Utilized difference frequency generation (DFG) between two branches of an Er:fiber comb.
    • Employed separate Yb:fiber and Er:fiber amplifiers for the comb branches.
    • Achieved passive carrier-envelope phase stabilization for enhanced coherence.

    Main Results:

    • Generated a mid-IR frequency comb with a 100 MHz repetition rate and 100 fs pulse duration.
    • Achieved average output powers of 6.7 W at 2.9 µm (idler) and 14.9 W at 1.6 µm (signal).
    • Demonstrated excellent beam quality and passive carrier-envelope phase stabilization.

    Conclusions:

    • The developed high-power mid-IR frequency comb is a significant advancement in laser technology.
    • Its high power, beam quality, and stability make it ideal for generating broadband combs.
    • This light source shows promise for applications in far-infrared, visible, and deep ultraviolet spectroscopy.