Abstract
We demonstrate the generation of few-cycle deep ultraviolet pulses via frequency upconversion of 5-fs near-infrared pulses in argon using a laser-fabricated gas cell. The measured spectrum extends from 210 to 340 nm, corresponding to a transform-limited pulse duration of 1.45 fs. We extract from a dispersion-free second-order cross-correlation measurement a pulse duration of 1.9 fs, defining a new record in the deep ultraviolet spectral range.
Highlights
Absorption of ultraviolet (UV) radiation is associated with electronic excitation
Starting from NIR pulses, third harmonic generation (THG) is the most suitable process to be exploited for UV generation
This method allows a broad spectral bandwidth to be upconverted without inducing significant dispersion to the generated UV pulses, at the expenses of a lower conversion efficiency
Summary
Absorption of ultraviolet (UV) radiation is associated with electronic excitation. In most of the molecules, this excess of energy is often dissipated via nonradiative decay. Few-fs pulses in the visible or nearinfrared (NIR) spectral range can be routinely generated via hollow-core fiber compression [9] and filamentation [10].
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