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Breuer, John; Graf, Roswitha; Apolonski, Alexander and Hommelhoff, Peter (2014): Dielectric laser acceleration of nonrelativistic electrons at a single fused silica grating structure: Experimental part. In: Physical Review Special Topics-Accelerators and Beams, Vol. 17, No. 2, 021301 [PDF, 2MB]

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Abstract

Recently, our group has demonstrated dielectric laser acceleration of nonrelativistic electrons at a scalable fused silica grating [J. Breuer and P. Hommelhoff, Phys. Rev. Lett. 111, 134803 (2013)]. This represents a demonstration of the inverse Smith-Purcell effect in the optical regime. The third spatial harmonic of the grating, which is excited by Titanium: sapphire laser pulses, synchronously accelerates 28 keV electrons derived from an electron microscope column. We observe a maximum acceleration gradient of 25 MeV/m. Here we present the experimental setup in detail. We describe grating-related issues such as surface charging and alignment as well as damage threshold measurements. A detailed explanation of the detection scheme is given. Furthermore, extensive numerical simulations are discussed, which agree well with the experimental results.

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