1.06 μm 150 psec laser damage study of diamond turned, diamond turned/ polished and polished metal mirrors Page: 2 of 31
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1.061m 150 psec Laser Damage Study of Diamond Tu ied, Diamond Turned/Polished
and Polished Metal Mirr:rs t
T. T. Saito*, D. Milam, P. Baker, and G. Murphy, L-wrence Livermore Laboratory
Livermore, California 9455L
Using a well characterized 1.06 in 150 psec glas laser pulse we have
studied the damage characteristics for diamond turned,, diamond turned/polished,
and polished copper and silver mirrors less than 5 cm diameter. Although most
samples were tested with a normal angle of incidence, some were tested at 450
with different linear polarization showing an increase in damage threshold for
S polarization. Different damage mechanisms observed will be discussed. Laser
damage is related to residual surface influences of the fabrication process.
Our first attempts to polish diamond turned surfaces resulted in a significant
decrease in laser damage threshold. The importance of including the heat of
fusion in the one dimensional heat analysis of the theoretical damage
threshold and how close our samples came to the theoretical damage threshold
will be discussed.
Key words: Damage threshold; diamond turned optics; copper mirror, 1.06 um
polishing; dark field photography.
t Work performed under the auspices of the U.S. Energy Research and Development
* Detached duty from the Air Force Weapons Laboratory, Laser Division,
Kirtland AFB, NM 87117
-. - ~ -
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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/m1/2/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.