Abstract
An off-axis beam is used to control the phase matching condition in the high harmonic generation process in a semi-infinite gas cell leading to suppression or enhancement of the harmonic emission.
Highlights
High order harmonic generation (HHG) that occurs in the interaction between an intense laser pulse and a gas medium can provide a table-top coherent radiation source in the short wavelength range from the vacuum ultraviolet to the soft x-ray region [1,2]
Phase matched high harmonic generation at very high photon energy is difficult to achieve because the required strong driving field creates a large free electron dispersion through strong ionization of the gas and as a result phase matching cannot be achieved by varying the pressure
We demonstrate the important role of the dipole phase on the phase matched HHG process which has not been included in most previous studies
Summary
High order harmonic generation (HHG) that occurs in the interaction between an intense laser pulse and a gas medium can provide a table-top coherent radiation source in the short wavelength range from the vacuum ultraviolet to the soft x-ray region [1,2]. We demonstrate the important role of the dipole phase on the phase matched HHG process which has not been included in most previous studies.
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