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Hybrid optics for focusing ultrashort laser pulses

: Fuchs, U.; Zeitner, U.; Tünnermann, A.


Optics Letters 31 (2006), Nr.10, S.1516-1518
ISSN: 0146-9592
Fraunhofer IOF ()

We present a specially designed hybrid optics comprising refraction and diffraction effects for tight spatial and temporal focusing of ultrashort laser pulses. Both aims can be put into practice by having a high numerical aperture (NA=0.45) and low internal dispersion at the same time. We are presenting what we believe is the first experimental realization of such a hybrid short plus focusing optics. The focusing properties are compared with a commonly used microscope objective (20\'01,NA=0.45) in theory and experimentally.