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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 25, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

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Published on: April 28, 2016

Miniature wavelength-selectable Raman laser: new insights for optimizing performance.

Xiaoli Li1, Helen M Pask, Andrew J Lee

  • 1Department of Physics and Astronomy, Macquarie University, Sydney, NSW, 2109, Australia. lily.li@mq.edu.au

Optics Express
|January 26, 2012
PubMed
Summary

We developed a compact Raman laser with tunable yellow or lime output. This laser achieves record optical conversion efficiencies for miniature devices by optimizing nonlinear processes and crystal length.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Nonlinear Optics

Background:

  • Crystalline Raman lasers offer potential for visible light generation.
  • Miniature devices are desirable for practical applications.
  • Optimizing nonlinear processes and cavity design is crucial for efficiency.

Purpose of the Study:

  • To report a miniature, wavelength-selectable crystalline Raman laser.
  • To investigate the influence of nonlinear processes on laser performance.
  • To determine optimal design considerations for visible output.

Main Methods:

  • Experimental and theoretical study of a tunable crystalline Raman laser.
  • Utilizing a lithium triborate (LBO) crystal for intracavity frequency mixing.
  • Temperature tuning of the LBO crystal to select output wavelengths (588 nm and 559 nm).
  • Analysis of nonlinear interplay and resonator losses using threshold measurements.

Main Results:

  • Achieved continuous-wave (CW) output powers of 320 mW (yellow) and 660 mW (lime).
  • Demonstrated record diode-visible optical conversion efficiencies of 8.4% and 17% for miniature devices.
  • Observed complete suppression of the first-Stokes field due to nonlinear interplay.
  • Identified crystal bulk losses as dominant, favoring shorter LBO crystals for higher visible output power.

Conclusions:

  • The developed Raman laser provides tunable visible output with high efficiency.
  • Nonlinear process interplay significantly impacts laser behavior and output.
  • Shorter intracavity LBO crystals are beneficial for maximizing visible output power in CW Raman lasers.
  • These findings offer new design guidelines for efficient miniature visible Raman lasers.