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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.8K
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...
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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Microwave-controlled efficient Raman sub-harmonic generation.

K V Rajitha, Tarak N Dey, Sumanta Das

    Optics Letters
    |September 23, 2015
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate a new method for efficient Raman sub-harmonic generation using microwave-induced coherence in atomic vapor. This technique allows controllable spectral amplitudes for Raman sub-harmonics in standard experimental setups.

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    Area of Science:

    • Atomic physics
    • Quantum optics
    • Nonlinear optics

    Background:

    • Raman sub-harmonic generation is a key process in nonlinear optics.
    • Achieving efficient generation often requires complex experimental conditions.
    • Atomic vapor systems offer unique properties for light-matter interactions.

    Purpose of the Study:

    • To propose a novel and efficient scheme for Raman sub-harmonic generation.
    • To investigate the role of microwave-induced coherence in this process.
    • To demonstrate controllable spectral amplitudes of Raman sub-harmonics.

    Main Methods:

    • Utilizing a three-level Lambda-configuration atomic vapor system.
    • Inducing hyperfine coherence between lower metastable states using microwave fields.
    • Analyzing the influence of microwave field amplitude and phase on sub-harmonic generation.

    Main Results:

    • Demonstrated efficient Raman sub-harmonic generation.
    • Showed that microwave field parameters precisely control spectral amplitudes.
    • Verified the feasibility of the scheme in standard atomic vapor cells.

    Conclusions:

    • The proposed scheme offers an efficient pathway for Raman sub-harmonic generation.
    • Microwave-induced coherence provides a robust method for controlling spectral properties.
    • The technique is practical for implementation in existing experimental setups.