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High aspect ratio taper-free microchannel fabrication using femtosecond Bessel beams

2010; Optica Publishing Group; Volume: 18; Issue: 2 Linguagem: Inglês

10.1364/oe.18.000566

1094-4087

M. K. Bhuyan, François Courvoisier, P.-A. Lacourt, Maxime Jacquot, Luca Furfaro, Michael J. Withford, John M. Dudley,

Nonlinear Optical Materials Studies

We present a systematic study of femtosecond laser microchannel machining in glass using nondiffracting Bessel beams. In particular, our results identify a source and focusing parameter working window where high aspect ratio taper-free microchannels can be reproducibly produced without sample translation. With appropriate source parameters, we machine channels of 2 microm diameter and with aspect ratios up to 40. We propose the filamentation stability of the Bessel beam propagation as the critical factor underlying the controlled and reproducible results that have been obtained.