Lecture image placeholder

Premium content

Access to this content requires a subscription. You must be a premium user to view this content.

Monthly subscription - $9.99Pay per view - $4.99Access through your institutionLogin with Underline account
Need help?
Contact us
Lecture placeholder background



October 16, 2023

Chicago, United States

UV Picosecond Laser Drilling of ABF Material for Printed Circuit Boards Using Laser Burst Mode and Beam Shaping


beam shaping

laser burst

ajinomoto build-up film

laser microvia drilling

ultrashort pulsed (usp) laser

For insulting layers in multi-layer printed circuit boards, Ajinomoto build-up film (ABF) is one of the most crucial component in manufacturing of high-performance electronic devices. The ongoing demand for miniaturized electronic components with advanced functionalities requires a higher power density in packaging and interconnect technology, in turn demanding for a reduction of the diameter of laser drilled microvias.
Recently, ultrashort pulsed lasers have gained considerable attention for microdrilling owing to a negligible heat material interaction and the possibility of small focal diameters by a wavelength in the ultraviolet regime. In order to evaluate its full potential for laser microvia fabrication, we report on a comprehensive study of laser microvia percussion drilling of ABF using a high-power laser system with a wavelength of 355 nm and a laser pulse duration of 10 ps. For the optimization of the laser drilling quality, which in turn is defined by the fabricated taper and the diameter of the microvia as being evaluated by laser scanning microscopy and materialography, laser bursts containing of a number of intra-burst pulses between 1-6 at an intra-burst pulse repetition rate of 82 MHz, different number of laser pulses, laser pulse fluence and laser burst repetition rates, respectively, are varied. In addition, diffractive optical elements are used to transform the Gaussian beam into a round uniform-intensity laser spot within the focal plane of the telecentric f-theta lens to influence the drilling process.

Next from ICALEO 2023

Study of Efficient Removal Method of Concrete Surface by Fiber Laser

Study of Efficient Removal Method of Concrete Surface by Fiber Laser


Shoki Hamaoka and 3 other authors

16 October 2023

Stay up to date with the latest Underline news!

Select topic of interest (you can select more than one)


  • All Lectures
  • For Librarians
  • Resource Center
  • Free Trial
Underline Science, Inc.
1216 Broadway, 2nd Floor, New York, NY 10001, USA

© 2023 Underline - All rights reserved