Fluorescence and absorption in electron beam excited argon

Observation of vacuum-ultraviolet Ar2* radiation gain at 126 nm produced by an ultrashort high-intensity laser pulse propagating in a hollow fiber

We observed a small-signal gain of Ar2* emission at 126 nm by use of a hollow fiber to guide the high-intensity laser propagation in high-pressure Ar. The small-signal gain coefficient was measured to be 0.05 cm(-1) at 126 nm. Kinetic analysis revealed that the electrons produced by the high-intensity laser through an optical-field-induced ionization process initiated the Ar2* production processes. The increase in the emission intensity was measured to be exp(2.5), with an increase in the fiber length.

Optical-optical double resonance involving the coupling of a vacuum-ultraviolet spark source with a laser: two-step excitation in rare gases

An experimental setup including the synchronized coupling of a VUV spark source with a laser is described. Experimental results on the depletion of Ar(2), Kr(2), and Xe(2) excimer fluorescence illustrate the capability of the system.