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We introduce a simple and practical method to create ultrashort intenseoptical vortices for applications involving high-intensity lasers. Our methodutilizes femtosecond laser pulses to laser-etch grating lines intolaser-quality gold mirrors. These grating lines holographically encode anoptical vortex. We derive mathematical equations for each individual gratingline to be etched, for any desired (integer) topological charge. We investigatethe smoothness of the etched grooves. We show that they are smooth enough toproduce optical vortices with an intensity that is only a few percent lowerthan in the ideal case. We demonstrate that the etched gratings can be used ina folded version of our 2f-2f setup [Mariyenko et al., Opt. Express 19, 7599(2005)] to compensate angular dispersion. Lastly, we show that the etchedgratings withstand intensities of up to 10^12 W/cm2.

Ultrashort intense-field optical vortices produced with laser-etched mirrors