Measurements at 351 nm of temporal dispersion in fibers Page: 6 of 26
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The time sweep of the streak camera was calibrated against rattle-down pulses
from a 2.54-cm silica etalon with reflective faces. The resulting curve is shown in
Fig. 4. The sweep rate is about 2 ps/pixel, and the useable portion of the sweep is
about 1000 ps in duration.
Fig. 4. Calibration of the
1.5 streak camera.
S20 streak camera #9.
1X sweep card.
I I I I I I I
0 100 200 300 400 500 600
III. Reduction of the data.
In principle, reduction of the data was simple. We decided to characterize the
dispersion by a simple equation, D = (F2 - A2), where F and A are the full widths
at half maximum (FWHM) for, respectively, the fiber-path streak and the air-path
streaks. Therefore, measurement of FWHM was all that was required. However,
the uncertainties indicated by a first pass through the data were much larger than
expected. The origin of the large uncertainties was identified by analyzing the
variation of FWHM with counts in the streak record.
These general observations characterize all of the data from this experiment.
(1) The air-path streak exhibited a variation of FWHM with both spatial location in
the beam and with counts in the streak. These variations increased the
measurement uncertainty and caused the FWHM to increase slightly with counts.
(2) The fiber-path streaks were more varied. Some were spatially uniform in
appearance, and for these the FWHM was spatially uniform. Others exhibited
strong spatial variation of FWHM. In general, the measured FWHM increased
rapidly with increase in camera counts.
(3) The calculated dispersion varied with counts in the fiber-path streak, but was
almost independent of counts in the air-path streak.
(4) The range in values of dispersion for a particular experiment was usually greater
than the uncertainty in individual measurements.
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Griffith, R; Milam, D; Sell, W & Thompson, C. Measurements at 351 nm of temporal dispersion in fibers, report, November 4, 1998; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc738822/m1/6/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.