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6 papers
Bright Coherent Ultrahigh Harmonics in the keV X-Ray Regime from Mid-Infrared Femtosecond Lasers
Tenio Popmintchev, Ming-Chang Chen, Dimitar Popmintchev +17
High harmonic generation traditionally combines ~100 near-infrared laser photons, to generate bright, phase matched, extreme ultraviolet beams when the emission from many atoms add…
Ultrafast serrodyne optical frequency translator
Prannay Balla, Henrik Tünnermann, Sarper H. Salman +4
The serrodyne principle enables shifting the frequency of an electromagnetic signal by applying a linear phase ramp in the time domain [1]. This phenomenon has been exploited to fr…
Temporal quality of post-compressed pulses at large compression factors
Esmerando Escoto, Anne-Lise Viotti, Skirmantas Alisauskas +3
Post-compression of ultra-short laser pulses via self-phase modulation is routinely employed for the generation of laser pulses with optical bandwidths reaching far beyond the lase…
Following excited-state chemical shifts in molecular ultrafast x-ray photoelectron spectroscopy
Dennis Mayer, Fabiano Lever, David Picconi +17
The conversion of photon energy into other energetic forms in molecules is accompanied by charge moving on ultrafast timescales. We directly observe the charge motion at a specific…
Post-compression of picosecond pulses into the few-cycle regime
Prannay Balla, Ammar Bin Wahid, Ivan Sytcevich +18
In this work, we demonstrate post-compression of 1.2 picosecond laser pulses to 13 fs via gas-based multi-pass spectral broadening. Our results yield a single-stage compression fac…
Filamentation of Mid-IR pulses in ambient air in the vicinity of molecular resonances
Valentina Shumakova, Skirmantas Alisauskas, Pavel Malevich +8
Properties of filaments ignited by multi-millijoule, 90-fs mid-IR pulses centered at 3.9 μm are examined experimentally by monitoring plasma density and losses as well as spectral…