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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

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

Published on: November 22, 2019

Multi-wavelength, all-solid-state, continuous wave mode locked picosecond Raman laser.

Eduardo Granados1, Helen M Pask, Elric Esposito

  • 1MQ Photonics Research Centre, Department of Physics and Engineering, Macquarie University, 2109 New South Wales, Australia. granados@ics.mq.edu.au

Optics Express
|April 15, 2010
PubMed
Summary
This summary is machine-generated.

We demonstrate a cascaded continuous wave (CW) mode-locked Raman oscillator, generating short pulses at visible wavelengths. This efficient technique extends Raman laser capabilities for broader applications.

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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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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Published on: February 28, 2016

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Continuous wave (CW) mode-locked lasers are crucial for generating ultrashort optical pulses.
  • Raman lasers offer wavelength tunability through stimulated Raman scattering.
  • Cascaded Raman processes can extend wavelength generation but require efficient methods.

Purpose of the Study:

  • To demonstrate a cascaded continuous wave (CW) mode-locked Raman oscillator.
  • To achieve efficient generation of short-pulse visible radiation using this technique.
  • To extend the operational wavelength range of mode-locked Raman lasers.

Main Methods:

  • Utilized a cascaded continuous wave (CW) mode-locked Raman oscillator setup.
  • Employed a standard inexpensive picosecond Nd:YAG oscillator as the pump source.
  • Investigated pulse compression and output power characteristics at different Stokes wavelengths.

Main Results:

  • Achieved pulse compression from 28 ps to 6.5 ps (first Stokes) and 5.5 ps (second Stokes).
  • Obtained maximum output powers of 2.5 W at 559 nm and 1.4 W at 589 nm.
  • Demonstrated slope efficiencies up to 52% for the cascaded Stokes outputs.

Conclusions:

  • The cascaded CW mode-locked Raman oscillator is an efficient method for generating short-pulse visible radiation.
  • This technique successfully extends mode-locked Raman laser operation to wavelengths between 500-650 nm.
  • The system offers a simple and cost-effective approach for producing tunable visible picosecond pulses.