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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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Related Experiment Video

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A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Multiwatts narrow linewidth fiber Raman amplifiers.

Yan Feng1, Luke Taylor, Domenico Bonaccini Calia

  • 1European Southern Observatory, Garching, Germany. yfeng@eso.org

Optics Express
|July 24, 2008
PubMed
Summary
This summary is machine-generated.

Researchers achieved a 4.8 W, 1178 nm fiber Raman amplifier using a diode laser. High amplification and efficiency were demonstrated, limited by stimulated Brillouin scattering.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Materials Science

Background:

  • Fiber lasers offer efficient and compact solutions for various applications.
  • Raman amplification is a key technique for extending laser wavelengths and enhancing power.
  • Distributed feedback diode lasers provide narrow linewidth emission suitable for amplification.

Purpose of the Study:

  • To develop a high-power, narrow linewidth fiber Raman amplifier at 1178 nm.
  • To investigate the efficiency and amplification limits of Raman amplification in standard single-mode fibers.
  • To identify key parameters for optimizing fiber Raman amplifiers.

Main Methods:

  • Utilizing Raman amplification of a distributed feedback diode laser.
  • Employing a 1120 nm Ytterbium (Yb) fiber laser as the pump source.
  • Characterizing amplifier performance including output power, efficiency, and amplification gain.

Main Results:

  • Achieved an output power of up to 4.8 W at 1178 nm.
  • Demonstrated over 10% optical conversion efficiency and 27 dB amplification.
  • Identified stimulated Brillouin scattering as the primary limitation to amplification.

Conclusions:

  • A narrow linewidth fiber Raman amplifier with significant power was successfully demonstrated.
  • The ratio of Raman to Brillouin gain coefficients is a critical figure of merit for amplifier design.
  • Further optimization can overcome stimulated Brillouin scattering for improved performance.