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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...

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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
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Published on: December 15, 2021

Cascade Raman soliton fiber ring laser.

A S Gouveia-Neto, A S Gomes, J R Taylor

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers generated ultrashort optical pulses using a cascade Raman, soliton-like process in a fiber ring oscillator. This advancement in fiber laser technology enables femtosecond pulse generation for various applications.

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    Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

    Published on: April 4, 2016

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Fiber ring oscillators are crucial for generating ultrashort optical pulses.
    • Cascade Raman scattering and soliton formation are key nonlinear optical phenomena.
    • Synchronous pumping with continuous-wave mode-locked lasers enables precise control over pulse generation.

    Purpose of the Study:

    • To generate femtosecond optical pulses with durations as short as 200 fsec.
    • To investigate the cascade Raman, soliton-like process in a fiber ring oscillator.
    • To utilize a dispersion-shifted single-mode fiber as the gain medium.

    Main Methods:

    • A fiber ring oscillator was employed as the experimental setup.
    • Synchronous pumping was achieved using a continuous-wave mode-locked Nd:YAG laser operating at 1.32 microm.
    • A dispersion-shifted single-mode fiber (lambda(0) = 1.46 microm) served as the gain medium.

    Main Results:

    • Optical pulses as short as 200 fsec at 1.5 microm and 230 fsec at 1.6 microm were successfully generated.
    • The cascade Raman, soliton-like process was confirmed as the mechanism for pulse shortening.
    • Stable femtosecond pulse generation was achieved within the fiber ring oscillator.

    Conclusions:

    • The study demonstrates the feasibility of generating ultrashort optical pulses via a cascade Raman, soliton-like process.
    • Dispersion-shifted fibers are effective gain media for achieving femtosecond pulse durations.
    • This technique offers a promising route for developing advanced fiber laser sources.