Damage thresholds of fluoride multilayers at 355 nm

Conference · Thu Oct 01 04:00:00 EDT 1992

OSTI ID:6577211

Chow, R; Kozlowski, M R; Loomis, G E; Rainer, F

Fluoride multilayer coatings were evaluated for use in 355 nm high reflector applications. The LaF[sub 3]/Na[sub 3]AlF[sub 6], NdF[sub 3]/Na[sub 3]AlF[sub 6] and GdF[sub 3]/Na[sub 3]AlF[sub 6] multilayers had laser damage thresholds of 20, 17.9 and 7.4 (measured at 10-ns pulsewidths), respectively. High tensile stresses in the coatings restricted this evaluation to only 5-layer-pair partial reflectors (49--52%).The LaF[sub 3]/Na[sub 3]AlF[sub 6], NdF[sub 3]/Na[sub 3]Al[sub 6] and GdF[sub 3]/Na[sub 3]AlF[sub 6] multilayers had tensile stresses of [approximately] 1.1 [times] 109, 1.3 [times] 109 and 9.3 [times] 10[sup 8] dynes/cm[sup 2], respectively. Substrate material and glow-discharge processing of the substrates were found to influence the density of stress-induced coating fractures and damage thresholds in some cases. If stress fracturing and scatter can be controlled, these fluoride material combinations are suited for 3[omega] applications.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6577211
• Report Number(s): UCRL-JC-111482; CONF-921047--1; ON: DE93009523
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700411 -- Inertial Confinement Devices-- (1992-)
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM FLUORIDES
COATINGS
DAMAGE
DEPOSITION
ELECTRIC DISCHARGES
FLUORIDES
FLUORINE COMPOUNDS
GADOLINIUM COMPOUNDS
GADOLINIUM FLUORIDES
GLOW DISCHARGES
HALIDES
HALOGEN COMPOUNDS
LANTHANUM COMPOUNDS
LANTHANUM FLUORIDES
LASER FUSION REACTORS
LASER MIRRORS
LASERS
LAYERS
MIRRORS
NEODYMIUM COMPOUNDS
NEODYMIUM FLUORIDES
NEODYMIUM LASERS
RARE EARTH COMPOUNDS
REFLECTIVE COATINGS
SODIUM COMPOUNDS
SODIUM FLUORIDES
SOLID STATE LASERS
THERMONUCLEAR REACTORS