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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

Updated: May 24, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Highly efficient Raman distributed feedback fibre lasers.

Jindan Shi1, Shaif-ul Alam, Morten Ibsen

  • 1Optoelectronics Research Centre, University of Southampton, Highfield, Southampton, SO17 1BJ, UK. jxs@orc.soton.ac.uk

Optics Express
|March 16, 2012
PubMed
Summary
This summary is machine-generated.

Highly efficient Raman distributed feedback (DFB) fiber lasers achieve 1.6 W CW output power. This breakthrough utilizes DFB Bragg gratings in germano-silica fibers, enabling narrow linewidths and high slope efficiencies.

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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Area of Science:

  • Photonics and Laser Technology
  • Optical Engineering
  • Materials Science

Background:

  • Development of efficient and narrow linewidth fiber lasers is crucial for various applications.
  • Existing rare-earth doped silica fiber lasers have limitations in output power and wavelength coverage.
  • Raman distributed feedback (DFB) lasers offer a potential alternative for generating specific wavelengths.

Purpose of the Study:

  • To demonstrate highly efficient Raman distributed feedback (DFB) fiber lasers for the first time.
  • To investigate the performance of DFB Bragg gratings written directly into commercially available passive germano-silica fibers.
  • To explore the potential for narrow linewidth all-fiber laser sources in novel wavelength bands.

Main Methods:

  • Fabrication of DFB Bragg gratings directly into low-NA and high-NA germano-silica fibers.
  • Pumping two 30 cm fiber lasers with CW power at 1068 nm.
  • Characterization of output power, threshold power, linewidth, and slope efficiency.

Main Results:

  • Achieved up to 1.6 W of continuous wave (CW) output power from Raman-DFB (R-DFB) lasers.
  • Observed low threshold powers of ~2 W (low-NA) and ~1 W (high-NA) fiber lasers.
  • Attained narrow linewidths (<0.01 nm) at ~1117 nm and ~1109 nm, with high slope efficiencies (~74% and ~93%).

Conclusions:

  • Demonstrated the feasibility of highly efficient R-DFB fiber lasers with significant CW output power.
  • Results suggest minimal energy loss as heat, indicating efficient energy transfer.
  • The technology opens possibilities for narrow linewidth all-fiber lasers in new wavelength bands and centimeter-level devices with improved materials.