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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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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Published on: February 4, 2017

Solid-state Raman laser generating discretely tunable ultraviolet between 266 and 320 nm.

Richard P Mildren1, Hamish Ogilvy, James A Piper

  • 1Centre for Lasers and Applications, Macquarie University, Sydney, New South Wales, Australia. rmildren@ics.mq.edu.au

Optics Letters
|March 7, 2007
PubMed
Summary

We developed a novel KGd(WO(4))(2) Raman laser system. This laser generates tunable ultraviolet output at eight selectable wavelengths using nonlinear frequency conversion, offering versatile applications in spectroscopy and materials processing.

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Area of Science:

  • Laser Physics and Photonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Raman lasers offer unique wavelength tunability.
  • Generating tunable output in the ultraviolet (UV) spectrum is challenging.
  • Potassium gadolinium tungstate (KGd(WO(4))(2)) is a promising material for laser applications.

Purpose of the Study:

  • To develop a tunable UV Raman laser system.
  • To utilize nonlinear optical processes for wavelength generation.
  • To achieve selectable output wavelengths in the 266-320 nm range.

Main Methods:

  • A KGd(WO(4))(2) Raman laser was pumped using a 532 nm laser.
  • Intracavity nonlinear frequency conversion, specifically second harmonic and sum-frequency mixing, was employed.
  • Beta-barium borate (BBO) crystal was used as the nonlinear medium.

Main Results:

  • Selectable output was generated at eight distinct wavelengths between 266-320 nm.
  • Pulse energies reached up to 0.22 mJ at a 10 Hz repetition rate.
  • Average output powers of up to 48 mW were achieved at a 5 kHz repetition rate.

Conclusions:

  • The developed KGd(WO(4))(2) Raman laser effectively generates tunable UV radiation.
  • Intracavity nonlinear frequency mixing in BBO is a viable method for UV wavelength selection.
  • The system demonstrates potential for applications requiring tunable UV light sources.