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Increase in nanosecond laser-induced damage threshold of sapphire windows by means of direct dielectric barrier discharge plasma treatment

 
: Gerhard, C.; Tasche, D.; Munser, N.; Dyck, H.

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Optics Letters 42 (2017), Nr.1, S.49-52
ISSN: 0146-9592
Englisch
Zeitschriftenaufsatz
Fraunhofer IST ()
laser damage; plasma; polishing; optical fabrication

Abstract
In this Letter we present a novel approach for increasing the nanosecond laser-induced damage threshold (LIDT) of sapphire windows. It is shown that after direct dielectric barrier discharge plasma treatment at atmospheric pressure for 90 s the LIDT is increased by a factor of 1.5 with respect to untreated samples. Several possible underlying mechanisms are introduced. For instance, organic contaminants and residues from polishing agents were removed by the plasma as ascertained by XPS measurements.

: http://publica.fraunhofer.de/dokumente/N-434839.html