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Related Concept Videos

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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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.
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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Related Experiment Video

Updated: Apr 30, 2026

Writing Bragg Gratings in Multicore Fibers
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Random fiber Bragg grating Raman fiber laser.

Mathieu Gagné, Raman Kashyap

    Optics Letters
    |May 3, 2014
    PubMed
    Summary

    This study introduces a novel Raman random fiber laser (RRFL) utilizing a long random fiber Bragg grating for coherent feedback. This innovative laser design offers a low threshold and tunable spectral characteristics for various applications.

    Area of Science:

    • Photonics
    • Laser Physics
    • Optical Engineering

    Background:

    • Random fiber lasers offer unique spectral properties.
    • Existing random fiber lasers often rely on incoherent Rayleigh scattering feedback.
    • Novel feedback mechanisms are needed for advanced laser performance.

    Purpose of the Study:

    • To demonstrate a Raman random fiber laser (RRFL) using a long random fiber Bragg grating (RFBG-RRFL).
    • To investigate the use of random phase shifts within a Bragg grating as a coherent feedback mechanism.
    • To analyze the spectral characteristics, threshold, and linewidth of the proposed RFBG-RRFL.

    Main Methods:

    • Fabrication of a meter-long random fiber Bragg grating.
    • Pumping the grating at 1480 nm to achieve lasing.

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  • Characterization of the laser output spectrum, pump intensity dependence, threshold, and linewidth.

    • Main Results:

    • Successful demonstration of a novel RFBG-RRFL.
    • Observation of coherent feedback from randomly distributed phase shifts.
    • Emission of a CW signal at 1576 nm.
    • Tunable emission spectrum with single and multi-mode characteristics based on pump intensity.
    • Achieved a low threshold of 2.2 W and a linewidth of approximately 430 kHz.

    Conclusions:

    • The RFBG-RRFL presents a viable alternative to Rayleigh scattering-based random fiber lasers.
    • The use of random phase shifts in a Bragg grating provides an effective coherent feedback mechanism.
    • The demonstrated laser exhibits promising characteristics for potential applications requiring tunable spectral output and low threshold operation.