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Related Concept Videos

Raman Spectroscopy: Overview01:20

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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.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Related Experiment Video

Updated: Apr 25, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Nonlinear Raman-Nath diffraction of femtosecond laser pulses.

A M Vyunishev, V V Slabko, I S Baturin

    Optics Letters
    |August 15, 2014
    PubMed
    Summary

    We investigated nonlinear Raman-Nath diffraction of laser pulses in photonic structures. Results show frequency combs analogous to Maker fringes, with unique spectral redshift behavior.

    Area of Science:

    • Nonlinear optics
    • Photonics
    • Laser physics

    Background:

    • Nonlinear Raman-Nath diffraction (NRND) is a key phenomenon in nonlinear optics.
    • Understanding spectral properties of light interacting with periodic structures is crucial.

    Purpose of the Study:

    • To study the nonlinear Raman-Nath diffraction (NRND) of femtosecond laser pulses in a 1D periodic nonlinear photonic structure.
    • To analyze the formation of frequency combs and their spectral characteristics.

    Main Methods:

    • Theoretical analysis of NRND using femtosecond laser pulses.
    • Calculation of second-harmonic spectra for different orders of transverse phase matching.
    • Investigation of effects like group-velocity mismatch and structural parameters.

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    Main Results:

    • Observed frequency combs in second-harmonic spectra, analogous to spectral Maker fringes.
    • Demonstrated a spectral redshift of second-harmonic intensity with propagation angle, contrasting with Čerenkov nonlinear diffraction.
    • Analyzed the influence of group-velocity mismatch and structural parameters on NRND.

    Conclusions:

    • Experimental results confirm theoretical predictions for NRND in nonlinear photonic structures.
    • The study provides insights into spectral comb generation and unique angular dispersion properties.