Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9221400w&link_type=abstract
Unknown
Physics
Irradiance, Laser Beams, Laser Outputs, Pulsed Lasers, Radiation Measurement, Crystals, Focusing, Frequency Converters, Laser Materials, Laser Targets
Scientific paper
This report briefly summarizes the analysis of a set of equivalent-plane photographs of the pulsed second-harmonic Nova beam that were obtained with the two beam laser diagnostic system (TBLDS). The photographs span a limited region of focus from 0.6 mm before focus to 1.8 mm after focus. Measurements of a 2.5 TW pulse at 'best focus' indicate an average intensity of 2 x 10(exp 16) W/cm(exp 2) with peaks of approximately 5 x 10(exp 17) W/cm(exp 2). Eighty percent of the laser power is contained inside a radius of 75 microns at which radius the radially-averaged intensity is approximately 5 x 10(exp 15) W/cm(exp 2). Second-harmonic laser energy diffracted into large angles by the frequency-conversion crystal support structure is present at intensities on the order of 5 x 10(exp 13) W/cm(exp 2) at twice the 80 percent radius, and greater than 5 x 10(exp 12) W/cm(exp 2) well outside this radius, where approximately 2 percent of the laser energy resides. The 80 percent-power diameter has been traditionally called the laser 'spot size'. Plots of the spot size versus focus reveal a 1-mm waist region after which the spot size approaches the geometrical limit expected for an f/4.5 beam. These results are similar to previously reported measurements of the Nova third-harmonic focus made with the Opposed Port Diagnostic. The independence of spot size on wavelength indicates that the characteristics of the Nova focus are determined principally by the wavefront of the 1.05-micron pulse, which is transferred to the harmonic pulse (with relatively minor modification due to crystal figure) in the frequency-conversion process.
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