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Shattered Beamlet Lens Blamed on Timing Error

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Kathleen G. Tatterson

LIVERMORE, Calif. -- A high-power experiment on Lawrence Livermore National Laboratory's Beamlet laser destroyed one of the setup's lenses and damaged another. No injuries were reported, but officials say that the September incident caused $70,000 in damage. Scientists were operating the laser at a 15-kJ, 20-ns pulse -- the highest power yet tested on the prototype laser -- when the 61-cm-diameter, 3.5-cm-thick lens shattered. Investigators reported that the operators used incorrect parameters and mistimed the operation. The errors caused a phenomenon called stimulated Brillouin...Read full article

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    Published: December 1996
    Glossary
    stimulated brillouin scattering
    In Stimulated Brillouin Scattering (SBS), an incident photon (usually laser light) interacts with acoustic phonons in a medium. The energy and momentum of the incident photon are transferred to the acoustic phonons, resulting in the creation of a scattered photon with a slightly different frequency (Stokes shift). Another scattered photon, called the anti-Stokes photon, can also be generated with a frequency higher than that of the incident photon. SBS is particularly important in the...
    Beamlet laserE. Michael CampbellLawrence Livermore National LaboratorylensesOpticsResearch & Technologystimulated Brillouin scatteringTech PulseLasers

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