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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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Related Experiment Video

Updated: Apr 3, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Actively mode-locked Raman fiber laser.

Xuezong Yang, Lei Zhang, Huawei Jiang

    Optics Express
    |September 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates active mode-locking in a Raman fiber laser for the first time, achieving stable 2 ns pulses. Harmonic mode-locking enabled tuning of the repetition rate across a wide range.

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    Area of Science:

    • Fiber lasers
    • Nonlinear optics
    • Laser physics

    Background:

    • Raman fiber lasers (RFLs) are crucial for generating specific wavelengths.
    • Active mode-locking is a technique to produce ultrashort laser pulses.
    • Experimental investigation of active mode-locking in RFLs is limited.

    Purpose of the Study:

    • To experimentally demonstrate active mode-locking in a Raman fiber laser for the first time.
    • To characterize the generated pulse properties and explore operational parameters.
    • To investigate the potential for tuning the repetition rate.

    Main Methods:

    • Utilized a ~500 m long, polarization-maintaining fiber loop cavity.
    • Employed a 1120 nm Ytterbium (Yb) fiber laser as the pump source.
    • Incorporated an acousto-optic modulator for active mode-locking.

    Main Results:

    • Achieved stable 2 ns pulse width at 1178 nm with a modulator opening time greater than 50 ns.
    • Observed pulse lengthening and potential second-order Raman Stokes at higher powers, controllable by adjusting modulator parameters.
    • Confirmed the absence of relaxation oscillations through transient pulse evolution measurements.
    • Demonstrated harmonic mode-locking for repetition rate tuning from 392 kHz to 31.37 MHz.

    Conclusions:

    • Active mode-locking is feasible and effective in Raman fiber lasers.
    • The developed system offers controllable pulse characteristics and a wide tunable repetition rate.
    • This work paves the way for advanced applications of mode-locked RFLs.