Physics – Optics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987fuen.sympr....t&link_type=abstract
Presented at the Symposium on Fusion Engineering, Monterey, Calif., 12 Oct. 1987
Physics
Optics
Backscattering, Nova Laser System, Optical Equipment, Research Facilities, Spectroscopy, Alignment, Plasma Diagnostics, Spectrometers, Streak Cameras
Scientific paper
When laser light is focused onto a target, a number of mechanisms can reflect or scatter the light back through the focus lens. The Backscatter Spectroscopy System (BSS) is a diagnostic that measures the properties of this reflected or scattered light. Just before the main focus lens on each of the ten Nova arms is a KDP crystal array for converting the 1 micron laser light to shorter harmonic wavelengths. This array rotates approx. 10 deg about the beam axis to select the 351 nm wavelength where most of the experiments are run. The BSS consists of a fused silica plate inserted into one of the beam lines before the KDP array. The reflector plate is shaped like one of the array elements and is aligned with it to minimize the effects of diffraction. The plate is mounted in a mechanism to allow alignment, as well as rotation with the KDP array when the converted wavelength is changed. The plate is mounted 10 deg off normal so that light can be reflected out of the beam tube. Roughly 4 percent of target-reflected light reflects off this plate and is transported to an optics table where it is analyzed. To transport the light to the optics table, an alignment insensitive relay lens system is used with a vacuum cell and turning mirrors. The instrumentation on the table includes a 0.5 meter spectrometer with an optical streak camera for time-resolved spectral information, a small photodiode array for intensity data, and a film pack for beam structure and system alignment information.
Drake Paul R.
Tietbohl Gregory L.
Young P. E.
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