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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.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...

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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
07:55

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Published on: September 22, 2017

A wavelength-versatile, continuous-wave, self-Raman solid-state laser operating in the visible.

Andrew J Lee1, David J Spence, James A Piper

  • 1MQ Photonics, Department of Physics and Astronomy, Macquarie University, Sydney, NSW, Australia. andrew.lee@mq.edu.au

Optics Express
|October 14, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a tunable laser emitting green-yellow light. It achieves stable, selectable multi-wavelength operation using simultaneous non-linear optical processes.

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Area of Science:

  • Optics and Photonics
  • Non-linear Optics
  • Laser Physics

Background:

  • Continuous-wave lasers are crucial for various applications.
  • Wavelength-selectable lasers offer enhanced flexibility.
  • Nd:GdVO(4) lasers are known for their efficiency.

Purpose of the Study:

  • To develop a continuous-wave laser with tunable output in the green-yellow spectral region.
  • To achieve wavelength-selectable operation at specific visible wavelengths.
  • To investigate the interplay between stimulated Raman scattering (SRS) and intracavity second harmonic/sum-frequency generation (SHG/SFG).

Main Methods:

  • Utilized a continuous-wave Nd:GdVO(4) self-Raman laser.
  • Integrated intracavity second harmonic and sum-frequency generation (SHG/SFG).
  • Employed experimental and numerical modeling to balance non-linear processes.

Main Results:

  • Achieved wavelength-selectable output at 532 nm, 559 nm, and 586 nm.
  • Demonstrated output power exceeding 3.5 W for each selected wavelength.
  • Showcased stable, selectable multi-wavelength visible operation.

Conclusions:

  • The developed laser provides on-demand operation at multiple visible wavelengths.
  • Balancing simultaneous SRS and SHG/SFG processes is key to stable multi-wavelength output.
  • This technology offers a versatile light source for applications requiring specific visible wavelengths.