International Journal of Electrical Machining
Online ISSN : 2188-5117
Print ISSN : 1341-7908
ISSN-L : 1341-7908
Singulation Characteristics of Semiconductor Package Using Pulsed Fiber Laser and SHG:YAG Laser
Yasuhiro OkamotoRyoji KitadaAkira OkadaYoshiyuki Uno
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2014 Volume 19 Pages 28-33


A laser singulation method by the superposition of a pulsed fiber laser and an SHG:YAG laser (SHG: Second Harmonic Generation) was proposed to perform the high-quality processing of semiconductor packages, which are consisted of thermosetting epoxy-resin with silica as the molding compounds and a glass epoxy board with insulator coatings for the semiconductor package. The superposition of the pulsed fiber laser and SHG:YAG laser with a high pulse repetition rate led to a straighter kerf shape with a smaller kerf width under the same pulse energy condition. A smaller kerf width was achieved by controlling the time-delay between the laser pulses compared with synchronized laser pulses. The heat affected zone from the cut surface was reduced by the superposition of the pulsed fiber laser and SHG:YAG laser. Moreover, synchronized laser pulses led to a smaller heat affected zone compared with unsynchronized pulses.

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© 2014 by the Japan Society of Electrical Machining Engineers
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