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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

365
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...
365
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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Related Experiment Video

Updated: Jun 26, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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High-power Raman lasing and efficient anti-Stokes generation in mm-sized crystalline disk resonators.

A S Bhadkamkar, S Carpenter, D C Gold

    Optics Letters
    |May 15, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Researchers generated a four-component Raman comb using a millimeter-sized calcium fluoride disk, achieving a new anti-Stokes sideband for compact terahertz-level frequency modulation sources.

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    Area of Science:

    • Nonlinear Optics
    • Laser Physics
    • Materials Science

    Background:

    • Previous work demonstrated high-power Stokes and second-order Stokes output from millimeter-sized calcium fluoride (CaF2) disks via stimulated Raman scattering.
    • Whispering gallery modes (WGM) in CaF2 disks were excited using a 1.06 µm pump laser coupled through a tapered fiber.

    Purpose of the Study:

    • To extend previous findings by demonstrating the production of an anti-Stokes sideband in a CaF2 disk resonator.
    • To characterize the resulting four-component Raman comb and its spectral range.
    • To investigate the influence of crystal orientation on Raman line thresholds.

    Main Methods:

    • Utilized stimulated Raman scattering in a mm-sized CaF2 disk.
    • Employed a 1.06 µm pump laser coupled to whispering gallery modes (WGM) via a tapered fiber.
    • Operated in near continuous-wave (CW) mode to generate the Raman comb.

    Main Results:

    • Successfully produced the first anti-Stokes sideband at power levels up to 60 µW.
    • Generated a four-component Raman comb spanning wavelengths from 1.023 to 1.14 µm.
    • Observed and validated threshold dependence of Raman lines on crystal orientation.

    Conclusions:

    • The study demonstrates the feasibility of generating an anti-Stokes sideband in CaF2 disk resonators.
    • These millimeter-sized resonators can serve as compact and efficient sources for terahertz-level frequency modulation.
    • Understanding crystal orientation effects is crucial for optimizing Raman comb generation.