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We demonstrated femtosecond laser ablation of PMMA using 2-color waveform synthesis. A modest and yet clear modulation in ablated area versus relative phase between the ω and 2 ω beams is observed.
We examine the interaction of relativistic laser pulses with plasma channels formed in a nitrogen cluster jet. We observe creation of nearly pure N5+ plasma channels and ionization injected wakefield beams with energies >100 MeV.
The two color (ω + 2ω) above threshold ionization spectrum of argon is measured at different intensity ratios and relative optical phase. We observe quantum phase shifts between interfering ionization pathways, indicating electron dispersion in strong-field ionization.
We present a study of features in photoelectron momentum distributions from strong-field ionization of noble gases for few-cycle pulses in the mid-infrared regime and assign characteristics to their classical and quantum mechanical origin.
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