Measurements at 351 nm of temporal dispersion in fibers Page: 7 of 26
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III.A. Assignment of FWHM to air-path streaks.
Consider first the assignment of FWHM to air-path streaks like the one
shown in Fig. 3. Because the camera observed the entire beam, and half of the beam
was covered by a filter, waveforms can be generated from column lineouts with
varied counts. Pulse duration measured in the high-count beam center usually
were greater than durations that were determined in the low-intensity skirt of the
beam. In the first few streaks that were examined, the center-to-skirt ratio varied
from 1 to 1.5, so it seemed possible to select shots for which the FWHM was
To this end, eight waveforms were generated for each air-path streak. Each
was an average of 3-5 columns. Two examples of the results are shown in Figs. 5
and 6. The line graph in each of these figures is a single row from the streak, so the
graph is intensity (counts) vs column number and not a temporal waveform. The
left half of the streak was attenuated by a tapered-thickness AR-coated wedge of NG-
11. The attached tags give the values of FWHM that were measured from columns
centered at the location of the tag.
For the data shown in Fig. 5, the measured pulse duration was about 20 ps in
the skirts of the beam, and about 26 ps at the center of the beam. The fact that the
pulse duration in the center of the beam is independent of counts indicates that the
spread of measured widths is a property of the beam, and not camera saturation.
single row from air-path
streak, 0618. 26 26
0 50 100 150 200 250
Fig. 5. Row from an air-path streak. Each tag gives the value in ps of the FWHM that was
measured from a 3-column average centered at the tagged position.
A pulse broadening that could be attributed to camera saturation is shown in
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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/m1/7/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.