High-order harmonic generation in a microfluidic glass device
Anna G. Ciriolo, Rebeca Martìnez Vàzquez, V. Toşa, Aldo Frezzotti, Gabriele Crippa, Michele Devetta, Davide Faccialà, Fabio Frassetto, Luca Poletto, Aditya Pusala, C. Vozzi, Roberto Osellame, S. Stagira
Abstract
Abstract We report on the efficient generation of high-order harmonics in helium gas inside complex glass micro-devices fabricated by femtosecond laser micromachining. By exploiting the three-dimensional capabilities and extreme flexibility of this fabrication technique we developed fluidic micro-structures in a fused-silica substrate that allowed us to achieve accurate control of the gas density inside a micrometer-sized microchannel. As a result, we achieved a broadband spectrum of extreme ultraviolet (XUV) radiation which extends up to 200 eV and we observed a considerable increase in the harmonics generation efficiency if compared with traditional harmonic generation in gas jets. We foresee that the application of femosecond-laser-micromachined glass devices to high-order harmonics generation can be extended to more complex on-chip systems including different functionalities, thus opening the possibility to future miniaturization of XUV and Attosecond beamlines.