Citation:Winfield, R. J., Bhuian, B., O’Brien, S. and Crean, G. M. (2007) 'Refractive femtosecond laser beam shaping for two-photon polymerization', Applied Physics Letters, 90(11), pp. 111115. doi: 10.1063/1.2713787
Three dimensional microstructure fabrication by two-photon polymerization is an established technique that normally uses single beam serial writing. Recently the use of a micro-optical element, to give multipoint beam delivery, was reported to give a degree of parallel processing. The authors describe an alternative approach to parallel processing using an axicon lens. This is a refractive element that, in combination with a high power microscope objective, efficiently transforms the laser beam from a Gaussian spot to an annulus. The authors demonstrate that the beam can polymerize a three dimensional shape, with nanoscale resolution. The use of more sophisticated refractive beam shaping is also discussed. (c) 2007 American Institute of Physics. (DOI:10.1063/1.2713787)
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