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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Related Experiment Video

Updated: Jun 22, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Continuum spectrum generation utilizing adiabatic compression in Raman amplifier for multi-wavelength pulse source.

Motoharu Matsuura, Naoto Kishi

    Optics Express
    |May 26, 2009
    PubMed
    Summary

    Researchers generated a uniform continuum spectrum using a Raman amplifier and dispersion-shifted fiber. This method improves spectral power uniformity for applications requiring broad, stable light sources.

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    Last Updated: Jun 22, 2026

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
    12:21

    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    Area of Science:

    • Nonlinear optics
    • Fiber optics

    Background:

    • Continuum spectrum generation is crucial for various photonic applications.
    • Existing methods often face challenges with spectral uniformity and power fluctuations.

    Purpose of the Study:

    • To demonstrate continuum spectrum generation using adiabatic compression in a Raman amplifier.
    • To investigate the use of dispersion-shifted fiber as the sole gain medium.
    • To optimize spectral uniformity by adjusting Raman pump parameters.

    Main Methods:

    • Utilizing adiabatic compression within a Raman amplifier setup.
    • Employing dispersion-shifted fiber as the counter-pumped Raman gain medium.
    • Adjusting the wavelength and power of the Raman pump source to control spectral properties.

    Main Results:

    • Successfully generated a continuum spectrum with improved power uniformity.
    • Achieved a 16-nm-wide uniform continuum spectrum.
    • Demonstrated a power fluctuation of less than 3 dB across the spectrum.
    • Used an 18.0 ps pulse-width seed pulse from an electroabsorption modulator.

    Conclusions:

    • Adiabatic compression in a Raman amplifier is an effective method for continuum generation.
    • Dispersion-shifted fiber serves as a suitable gain medium for this technique.
    • Raman pump source optimization is key to achieving high spectral uniformity.