Abstract
We show in proof-of-principle experiments an axial resolution improvement in two-photon-excited fluorescence and polymerization enabled by the short coherence length of two counter-propagating ultrashort laser pulses. The interference of these pulses generate a spatial interference fringe pattern, whose width scales inversely to the spectral bandwidth and is therefore considerably shorter than the effective focal length of a laser beam conventionally focused from only one side.
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Dobner, S., Höhl, M., Lüpken, N.M. et al. Coherence-based axial point-spread function engineering for two-photon excited polymerization. Appl. Phys. B 116, 793–798 (2014). https://doi.org/10.1007/s00340-014-5763-8
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DOI: https://doi.org/10.1007/s00340-014-5763-8