Nanosecond laser pulses for aluminum and copper drilling

Walid K Hamoudi

doi:10.30723/ijp.v16i36.26

Abstract

Nd:YAG laser pulses of 9 nanosecond pulse duration and operating wavelength at 1.06 μm, were utilized to drill high thermal conductivity and high reflectivity aluminum and copper foils. The results showed a dependence of drilled holes characteristics on laser power density and the number of laser pulses used. Drilled depth of 74 ϻm was obtained in aluminum at 11.036×108 W/cm2 of laser power density. Due to its higher melting point, copper required higher laser power density and/or larger number of laser pulses to melt, and a maximum depth of 25 μm was reached at 13.46×108 W/cm2 using single laser pulse.

Highlights

Drilling metals with lasers brings many advantages to this industrial practice
The micromachining of metals, silicon, polymers and ceramics was achieved with high aspect ratio using high power density nanosecond laser pulses [7]
No chemical or physical surface treatment was employed and the samples purity comes under “industrial grade” i.e. not so pure in order to demonstrate laser drilling on metals with specifications close to those used in real laser drilling

Summary

Introduction

Drilling metals with lasers brings many advantages to this industrial practice. In addition to its localized and non-contact features, the process is associated with a very limited heat affected zone (HAZ). ‫ هايكشوهتش والزي يعطي نبضات ليزسية بأهذ‬1.06 ً‫تن استخذام ليزس النيذهيوم – ٌاك انذي ٌعًم تانطىل انًىج‬ ‫ أوضحد انُرائج‬.‫ َاَىثاٍَح يٍ أجم ذثقٍة سقائق الالونيوم والنحاس ري الانعكاسية والتوصيلية الحشاسية العالية‬9 ‫ ذى انحصىل عهى عًق ثقة‬.‫إعرًاد خصائص انثقىب انًُجزج عهى كثافح قذرج شعاع انهٍزر وعذد انُثضاخ انهٍزرٌح‬ ‫ تسثة‬.٢‫سى‬/‫) واط‬11.036×108( ‫ ياٌكزوٌ فً رقاقح الانًٍُىو عُذ اسرخذاو َثضح نٍزر واحذج تقذرج نٍزر‬47 ‫طىنه‬ ‫ تاسرخذاو َثضح نٍزر واحذج تقذرج نٍزر‬52 ‫درجح الاَصهار انلاعهى نهُحاس فقذ ذى انحصىل عهى عًق ثقة طىنه‬ The micromachining of metals, silicon, polymers and ceramics was achieved with high aspect ratio using high power density nanosecond laser pulses [7].

Results

Conclusion