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 [Opt. Express 19, 7599 (2005)] to compensate angular dispersion. Finally, we show that the etched gratings withstand intensities of up to 1012 W/cm2.
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机译：我们介绍一种简单实用的方法来创建超短强度强光学涡流，以用于涉及高强度激光器的应用。我们的方法利用飞秒激光脉冲将光栅线激光蚀刻成激光质量的金镜。这些光栅线全息地编码光学涡旋。对于任何期望的（整数）拓扑电荷，我们针对要蚀刻的每条光栅线得出数学方程式。我们研究了蚀刻凹槽的平滑度。我们表明，它们足够光滑，可以产生强度比理想情况下低几个百分点的光学涡旋。我们证明了蚀刻光栅可以用于我们的2f-2f装置的折叠版本中。 Express 19，7599（2005）]来补偿角度色散。最后，我们表明蚀刻后的光栅可以承受高达1012 W / cm2的强度。
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