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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...

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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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Mode-locked picosecond diamond Raman laser.

David J Spence1, Eduardo Granados, Richard P Mildren

  • 1MQ Photonics Research Centre, Macquarie University, Sydney, New South Wales 2109, Australia. david.spence@science.mq.edu.au

Optics Letters
|February 18, 2010
PubMed
Summary

We developed a mode-locked diamond Raman laser producing yellow light at 573 nm. This laser achieved 2.2 W average power with tunable pulse durations down to 9 ps, explained by a new physical model.

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Area of Science:

  • Laser physics
  • Solid-state physics
  • Nonlinear optics

Background:

  • Mode-locked lasers are crucial for precise timing applications.
  • Diamond Raman lasers offer potential for generating new wavelengths.
  • Understanding pulse dynamics is key for laser optimization.

Purpose of the Study:

  • To develop and characterize a synchronously pumped mode-locked diamond Raman laser.
  • To investigate the influence of cavity length on output power and pulse duration.
  • To model the observed laser behavior using physical principles.

Main Methods:

  • Synchronous pumping of a diamond Raman laser cavity with a 532 nm mode-locked laser (26 ps pulses).
  • Characterization of output power and pulse duration (573 nm yellow light) as a function of cavity length.
  • Development of a theoretical model incorporating phonon dephasing and group velocity dispersion.

Main Results:

  • Achieved 2.2 W average output power at 573 nm.
  • Generated output pulses as short as 9 ps.
  • Observed significant variation in pulse duration with cavity length.
  • Validated the theoretical model for predicting laser performance.

Conclusions:

  • The synchronously pumped diamond Raman laser is a viable source for yellow light generation.
  • Phonon dephasing and dispersion significantly impact laser pulse characteristics.
  • The developed model accurately predicts the behavior of mode-locked diamond Raman lasers.