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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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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Raman fiber distributed feedback lasers.

Paul S Westbrook1, Kazi S Abedin, Jeffrey W Nicholson

  • 1OFS Laboratories, 19 Schoolhouse Road, Somerset, New Jersey 08873, USA. westbrook@ofsoptics.com

Optics Letters
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

We developed fiber distributed feedback (DFB) lasers utilizing Raman gain in germanosilicate fibers. These lasers achieved single-mode operation near 1584 nm, with one fiber yielding 350 mW output power.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Fiber distributed feedback (DFB) lasers are crucial components in optical communication and sensing.
  • Raman gain in germanosilicate fibers offers a promising mechanism for achieving laser oscillation.
  • Optimizing DFB laser performance requires careful consideration of fiber properties and cavity design.

Purpose of the Study:

  • To demonstrate fiber distributed feedback (DFB) lasers leveraging Raman gain.
  • To investigate the performance characteristics of DFB lasers in two distinct germanosilicate fibers.
  • To assess the potential for power amplification in subsequent Raman gain fibers.

Main Methods:

  • Fabrication of DFB laser cavities using 124 mm uniform fiber Bragg gratings with a π phase shift.
  • Pumping the lasers at 1480 nm to achieve stimulated Raman scattering.
  • Characterization of laser output power, linewidth, and threshold pump power.

Main Results:

  • Single longitudinal mode operation was achieved near 1584 nm in both tested fibers.
  • A commercial Raman gain fiber yielded a maximum output power of 150 mW, a linewidth of 7.5 MHz, and a threshold of 39 W.
  • A commercial highly nonlinear fiber demonstrated improved performance with 350 mW output power, a 4 MHz linewidth, and a 4.3 W threshold.

Conclusions:

  • Fiber DFB lasers utilizing Raman gain in germanosilicate fibers are feasible and can achieve single-mode operation.
  • Highly nonlinear fibers offer superior performance for Raman-gain-based DFB lasers compared to standard Raman gain fibers.
  • High pump power transmission (>75%) in these lasers enables potential for cascaded Raman amplification.