Fig. 1: Experimental set-up.
From: Strong-field coherent control of isolated attosecond pulse generation
(On the left) Parametric waveform synthesizer, consisting of a cryogenic Ti:Sapphire pump laser (red beam), a CEP-controlled seeding front-end (olive-green), two spectral channels (NIR in green, IR in orange, shaded VIS-channel under construction) and a multi-phase meter that allows to measure the RP (φ) among the spectral channels and the CEP (ψ) of the synthesized output (orange/green). A feedback system acting on multiple delay-lines allows to stabilize and control (φ, ψ), and therefore the output waveforms. The waveforms entering the attosecond beamline (on the right) are focused into an HHG gas target. The generated HHG radiation (blue) is separated from the driving optical field via a metallic filter and refocused by an Au-coated toroidal mirror into the electron collecting volume of a Kaesdorf ETF11 electron time-of-flight spectrometer, used for attosecond streaking measurements. The spectra of the HHG emission are measured by a McPherson 251MX grating spectrometer, equipped with an Andor Newton 940 CCD camera.
