28-nm laser damage testing of LIF Page: 4 of 10
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248-nm LASER DAMAGE TESTING OF LIF
Ultraviolet window materials such as lithium fluoride are suscep-
tible to three types of laier-induced damage: surface damage, bulk dam-
age, and color-center formation. In recent tests of seven samples - both
single crystal and press forged - we have observed bulk damage as the
primary failure mechanism.
Test conditions are listed in Table I.
In all tests - except one series that is described later - the ir.-
cideut beam was locused on the front surface of the sample. Since the
majority of damage sites were located in the bulk material at. a depth of
up to 2 ram, it is of interest to plot the laser fluence as a function of
depth in the crystal. Figure 1 is such a plot, which is obtained by ex-
trapolating measurements made in air, and ignoiing the possibility of
Bulk damage as observed in these tests was distinctly nonsubtle. A
bright spark was followed immediately by the creation of a large (~0.25 -
1.0 mm) fracture site that was star-like in appearanc*. Frequently a bulk
spark was observed, which persisted for tens of shots before extinction,
leaving no permanent visible record. These sites were listed in the "no
mean 1/e spot diameter
pulse rep. frequency
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Foltyn, S.R. & Newman, B.E. 28-nm laser damage testing of LIF, article, January 1, 1981; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1096671/m1/4/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.