In this work, Ackermann and co-workers report an elegant demonstration of pulsed VUV emission from green light via fifth-harmonic generation in a hollow-core waveguide filled with argon. The harmonic emission is remarkably enhanced through the modification of the gas dispersion that occurs close to a multi-photon atomic resonance. The performance of the system is further improved by exploiting the pressure-adjustable dispersion of the waveguide, which ensures that both pump and VUV light are phase-velocity matched over a reasonably long distance. These results pave the way to the development of novel gas-based ultraviolet sources whose efficiency might be boosted through operation near resonances.
You must log in to add comments.