Stimulated Raman Scattering in Micrometer-Sized Droplets: Time-Resolved Measurements

Abstract

Time resolved measurements of elastic scattering and stimulated Raman scattering (SRS) in micrometer sized water and carbon tetrachloride droplets irradiated with a pulsed, frequency doubled Nd:YAG laser (pulse width 8 nsec, lambda = 532 nm, peak intensity approx. 1 GW sq.cm.) are reported. Elastic scattering of light is instantaneous within our measurement error, estimated to be < + or - 3 nsec. On the other hand, the first Stokes shift in water and multiple-order (through ninth-order) Stokes shifts in carbon tetrachloride are delayed from the elastically scattered light by 5-7 nsec. The delay in SRS is apparently a consequence of structure resonances within the droplet, which acts as an optical cavity with relatively high Q. Quasi-periodic peaks in SRS spectra of water droplets are shown to be associated with elastic-scattering structure resonances having the same mode order. Yag lasers.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1988
Accession Number
ADA206901

Entities

People

  • Akash Biswas
  • E. Creegan
  • H. Latifi
  • P. Chylek
  • R. L. Armstrong

Organizations

  • New Mexico State University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Atmospheric Sciences
  • Carbon Tetrachloride
  • Elastic Scattering
  • Errors
  • Frequency
  • Intensity
  • Laser Pulses
  • Lasers
  • Light Pulses
  • Measurement
  • New Mexico
  • Optics
  • Raman Scattering
  • Resonance
  • Resonant Frequency
  • Scattering
  • Yag Lasers

Fields of Study

  • Physics

Readers

  • Aerosol Science/Aerosol Physics
  • Optical Physics and Photonics.
  • Solar Physics

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers