Fig. 4: Pressure tuning of the emitted transient.
a,b, The pressure at the entrance of the HCF was varied from 6 to 10 bar experimentally measured with an UV spectrometer (a) and in the simulations (b). Typically, the peak of the RDWs experiences a shift in wavelength. It moves towards lower wavelengths with lower pressures. Keeping the input intensity constant, the RDW gets weaker with lower pressures. c,d, The NPS measurements show the electric field for the different pressures (c) and the corresponding spectra, derived via Fourier transformation (d).
