Femtosecond Laser Irradiation followed by Chemical Etching is exploited to create microfluidic devices for High-order Harmonic Generation (HHG) in noble gases. A finetuning of the channels’ diameter and length permits the production of high-order harmonics in completely different regimes, going from the hollow waveguiding regime to the sub-mm interaction regime. We envisage that the high adaptability of our microfluidic approach will allow us to integrate more functionalities in the same integrated device thus paving the way to palm-top HHG solutions.
Since the first observation of High-order Harmonic Generation (HHG) in gas twenty years ago, the combination of intense research together with technological developments, has led to impressive progress in the field of extreme ultraviolet spectroscopy and attosecond science. Beam lines based on HHG extend over several meters and are based on instrumentation that requires careful alignment and even active stabilization systems. Therefore, a miniaturization of HHG beams will reduce the cost of these light sources and pave the way to their application in numerous new fields.
Femtosecond laser micromachining followed by chemical etching (FLICE) has already demonstrated its high potential in the fabrication of fused silica lab-on-a-chip devices; it can directly produce microfluidic networks in a 3D geometry directly buried in the glass substrate. Until now, they have been extensively used for the manipulation of fluids but they are perfectly suitable for the manipulation of gas as well.
In this work, we will demonstrate HHG in a gas filled microchannel network fabricated by the FLICE technique. The device structure will be based on hollow waveguides: several inlets will deliver the gas into a central hollow waveguide where the ultrafast laser will be coupled and HHG will take place. The high versatility of the FLICE technique will allow us to fabricate devices with modulated gas concentration and waveguide profile to achieve quasi-phase-matching conditions. Moreover, we will also demonstrate an integrated filtering chip that will allow to geometrically separate the main laser radiation from the XUV generated beam.
Adaptive Optics (AO) is a key technology for ground-based astronomical telescopes, allowing to overcome the limits imposed by atmospheric turbulence and obtain high resolution images. This technique however, has not been developed for small size telescopes, because of its high cost and complexity. We realized an AO system based on a Multi-actuator Adaptive Lens and a Shack-Hartmann wavefront sensor (WFS), allowing for a great compactness and simplification of the optical design. The system was integrated on a 11” telescope and controlled by a consumer-grade laptop allowing to perform Closed-Loop AO correction up to 400 Hz.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.