Journal
JOURNAL OF LASER APPLICATIONS
Volume 13, Issue 1, Pages 41-43Publisher
LASER INST AMER
DOI: 10.2351/1.1340338
Keywords
micromachining; femtosecond pulse laser
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Laser machining of submicron grooves on silicon wafer by 400 nm femtosecond laser is studied. A chirped pulse amplification based Ti:sapphire system that produces pulse with a pulse duration of 150 fs at a repetition rate of 1 kHz is used. Focusing lens with numerical aperture of 0.36 focuses the laser beam into a 3 mum laser spot (by calculation). The sample was translated at a linear speed of 400 mum/s during machining. 500 nm wide 100 nm deep groove was obtained on the wafer when the sample was irradiated by pulses with energy of similar to 50 nJ/pulse and 800 nm wide 650 nm deep groove was obtained by pulse with energy of similar to 100 nJ/pulse. (C) 2001 Laser Institute of America.
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