Laser-resistance sensitivity to substrate pit size of multilayer coatings

Laser-resistance sensitivity to substrate pit size of multilayer coatings

Nanosecond laser-resistance to dielectric multilayer coatings on substrate pits was examined with respect to the electric-field (E-field) enhancement and mechanical properties. The laser-induced damage sensitivity to the shape of the substrate pits has not been directly investigated through experiments, thus preventing clear understanding of the damage mechanism of substrate pits. We performed ...

Impact of substrate surface scratches on the laser damage resistance of multilayer coatings

Substrate scratches can limit the laser resistance of multilayer mirror coatings on high-peak-power laser systems. To date, the mechanism by which substrate surface defects affect the performance of coating layers under high power laser irradiation is not well defined. In this study, we combine experimental approaches with theoretical simulations to delineate the correlation between laser damag...

Multilayer deformation planarization by substrate pit suturing.

In the pursuit of 1064 nm high-power laser resistance dielectric coatings in the nanosecond region, a group of HfO2/SiO2 high reflectors with and without suture layers were prepared on prearranged fused silica substrates with femtosecond laser pits. Surface morphology, global coating stress, and high-resolution cross sections were characterized to determine the effects of ...

Advanced Multilayer Polyimide Substrate Utilizing UV Laser Microvia Technology

This paper presents ongoing work on an advanced flexible circuit interconnect substrate featuring a 24 x 24 (576 element) pad grid array pattern at 300 micron pitch. This eight metal layer circuit is being developed as a highdensity, pixel-level interconnection substrate for a two-dimensional (2D) ultrasound imaging transducer MEMS device. The flexible circuit substrate is constructed using lam...

Laser and enamel resistance to caries