Effect of binders on the damage threshold and refractive index of coatings prepared from colloidal suspensions
Addition of polyvinyl alcohol (PVA) to aqueous suspensions of AlOOH, ZrO2 and HfO[sub 2] has been found to increase the damage threshold and refractive index of coatings prepared from these suspensions. The increase in damage threshold may be due to the increase in coating strength brought about by the enhanced particle-to-particle bond strength due to the polymer binder. The binder also increases the refractive index by decreasing the porosity. This leads to a reduction in the number of layer pairs required for high reflection in a typical HR coating. A mirror consisting of only ten layer pairs of HfO[sub 2]-SiO[sub 2] with PVA binder in the HfO[sub 2] had a reflectivity of over 99% at 1.06 [mu]m and a damage threshold of 25-28 J/cm[sup 2]at 1.06 [mu]m with a 10 ns pulse. 6 refs, 5 figs, 4 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6712296
- Report Number(s):
- UCRL-JC-111520; CONF-9210295-4; ON: DE93009068
- Resource Relation:
- Conference: SPIE symposium on Boulder damage, Boulder, CO (United States), 28-30 Oct 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MIRRORS
REFLECTIVE COATINGS
ALUMINIUM HYDROXIDES
ALUMINIUM OXIDES
BINDERS
COLLOIDS
DAMAGE
HAFNIUM OXIDES
LASER RADIATION
PVA
REFRACTIVE INDEX
SUSPENSIONS
ZIRCONIUM OXIDES
ALCOHOLS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
COATINGS
DISPERSIONS
ELECTROMAGNETIC RADIATION
HAFNIUM COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
POLYVINYLS
RADIATIONS
REFRACTORY METAL COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
440600* - Optical Instrumentation- (1990-)