Fig. 3: NIR electric field sampling.
a, The measured electric field of CEP-stable pulses via EOS. The inset displays two low-energy fields in the presence of ND4 (magenta) and ND8 filters (yellow). Both fields are longer than the blue curve owing to additional material dispersion caused by the ND filters. b, The temporal profile of the CEP-stable pulses with a pulse duration of 15 fs FWHM. c, The retrieved spectrum and phase of the CEP-stable pulses. d, The retrieved spectrum of the CEP-stable pulses after attenuation with the ND4 and ND8 filters. The spectrum of the unattenuated pulse is shown in blue for comparison. The dashed black line represents the measured noise floor in the absence of the CEP-stable pulses on the balanced detector. The legend displays the acquisition time for each field, along with the ND filter label. ND, neutral density. The retrieved spectra are not corrected for the spectral response of the filters.
