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

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

2007-08-29

arxiv.org/abs/0708.3972v1

Physics

Optics

14 pages, 12 figures, submitted to Optics Express

Scientific paper

10.1364/AO.46.008583

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

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