Studies of target heating in the early stages of a Nike KrF laser pulse.

Details Studies of target heating in the early stages of a Nike KrF laser pulse. Studies of target heating in the early stages of a Nike KrF laser pulse.

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppgp1078k&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

A new set of front-surface diagnostics has been fielded on Nike KrF Laser target chamber. Its purpose is to measure the low levels of target preheat prior to the main laser pulse. Possible sources of preheat are Amplified Spontaneous Emission (ASE) from the laser amplifiers and beam-to-beam scattering that would result in some energy reaching the target ahead of the main pulse. The diagnostic setup consists of a fast high-detectivity thermoelectrically cooled HgCdZnTe infrared detector with a spectral bandwidth of 2-4 μm and a 10 nsec rise time as well as a near-infrared photomultiplier (PMT) with 10% quantum efficiency at 750 nm and a 2 nsec rise time. The HgCdZnTe detector and the PMT are imaging the target through a specially constructed large-aperture Cassegrain telescope and a commercial Questar telescope, respectively. Calibration is performed using a tungsten filament lamp. The noise floor of the detector corresponds to a black body at approximately 400 C. Measurements for various types of targets, including those with thin ( ~200 Ågold layers, as well as for different laser configurations will be presented.

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