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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: Jun 5, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

Passively mode-locked Raman laser.

W Liang1, V S Ilchenko, A A Savchenkov

  • 1OEwaves Inc., 2555 E. Colorado Blvd., Ste. 400, Pasadena, California 91107, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Researchers achieved mode-locked laser operation using a crystalline whispering gallery mode resonator. This generated an optical frequency comb with phase-locked modes, confirmed by radio-frequency beat notes, offering a new laser generation method.

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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

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

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Last Updated: Jun 5, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
14:18

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

Published on: February 28, 2016

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

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Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Area of Science:

  • Photonics
  • Laser Physics
  • Materials Science

Background:

  • Whispering gallery mode resonators are known for high-Q optical resonances.
  • Continuous wave laser pumping is a standard technique for exciting optical devices.
  • Optical frequency combs are crucial for precision measurements and spectroscopy.

Purpose of the Study:

  • To demonstrate mode-locked laser generation using a crystalline whispering gallery mode resonator.
  • To investigate the generation of an optical frequency comb via Raman offset.
  • To provide a theoretical explanation for the observed phenomenon.

Main Methods:

  • Optical pumping of a crystalline whispering gallery mode resonator with a continuous wave laser.
  • Characterization of the generated optical frequency comb.
  • Measurement of radio-frequency beat notes using a fast photodiode to confirm phase locking.

Main Results:

  • Successful generation of a mode-locked laser.
  • Observation of an optical frequency comb with phase-locked modes at the Raman offset.
  • Absence of conventional Kerr comb or hyperparametric oscillation.
  • Confirmation of phase locking through RF beat note measurements.

Conclusions:

  • A novel method for generating a mode-locked laser and an optical frequency comb has been demonstrated.
  • The observed comb is attributed to Raman offset phenomena, distinct from Kerr combs.
  • The findings offer new possibilities for frequency comb generation in integrated photonic devices.