1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors Page: 4 of 31
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The damage experiment is also shown in Fig. 1. A Galilean telescope
is adjusted to serve as a focusing element, with the beam waist being 4-8
meters distant as required. The reflection from the front surface of a
bare BK-7 wedge is centered on an aperture placed in front of the calori-
meter. The aperture is chosen to correspond to the approximate diameter
of the beam at the e2 intensity level, and the centering of the aperture
is photographically certified at :he beginning of each day of operation.
This calorimeter serves as the fundamental monitor of pulse energy.
The reflection from the rear surface of the BK-7 wedge is incident on
a 40% - 100% mirror pair used to form multiple replicas of the beam profile
existant in the sample plane. The images are recorded on polaroid film so
that the results of each firing can be viewed immediately thereby avoiding
the possibility of operating with significant undetected problems with the
beam profile. The .polaroid photos also furnish an instant estimate of the
incident energy density. We have found these estimates to be reproducible
to 20% as substantiated with much more ellaborate methods.
The replicas are also recorded on 1-Z plates. From five to nine
firings can be recorded on each plate. The most intensely exposed of
these is reduced using the Photocal routine. That serves to calibrate
absolutely the exposure vs. film density curve for that particular plate.
The film densities resulting from the remaining snots recorded on the same
plate can tnen be interpreted without recourse to Photocal.
Photocal iE a sophisticated generalized computer routine developed by
our colleague Dr. Joe Weaver for providing the energy density on the sample.
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Saito, T. T.; Milam, D.; Baker, P. & Murphy, G. 1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors, article, July 24, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc872232/m1/4/: accessed January 22, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.