Laser processing - the future of HDI manufacturing

Reliability of PWB microvias for high density package assembly

“…The nature of laser emission, for example, the wavelength, fluence (measured in joules per square centimeter), peak power, pulse width, and pulse rate, is different, and therefore different processing and quality is achieved depending on the type of materials considered for ablation. Figure 9 shows that the laser spot size resolution is directly related to laser wavelength [18]. The shorter the wavelength, the smaller the feature size that can be formed by a laser.…”