Substrate cores for laser through hole formation

Abstract

Substrate cores for laser through hole formation are described. Substrate core embodiments include a plurality of reinforcement material layers and a microfiller loaded resin disposed between the plurality of reinforcement material layers. Microfiller and reinforcement materials are selected to reduce opto-thermal mismatch for a laser of a predetermined bandwidth. In embodiments, the reinforcement material may include a fibrous polymer, reducing the thermal contrast with the microfiller loaded resin, and/or include a chromophore that absorbs within the laser bandwidth. In further embodiments, the microfiller is of a material having a high melting temperature to reduce thermal contrast with the reinforcement material.

Dependencies are inferred from the claim text.