Abstract
By using optical-field-ionization of helium we postcompress 50 fs pulses to 8 fs with a pulse energy of 8,7 mJ. Hence few cycle pulses were obtained with TW peak power and a good shot-to-shot stability.
Highlights
High energy femtosecond laser pulses can be used to generate high energy isolated attosecond (1 as = 10−18s) pulse via high harmonic generation in gases [1] or on plasmas [2]
Post compression techniques using hollow core capillary filled with noble gas have already demonstrated their potential [3]
The pulse output energy is limited by the critical power that is relatively low in high gas pressure required with this approach
Summary
High energy single attosecond pulses will open the door to nonlinear processes in XUV spectral region with attosecond resolution in the perturbative domain. Generating such pulses requires high energy ultra-short duration laser pulses with a high quality beam spatial profile. These characteristics can be fulfilled separately but it is very difficult to obtain both simultaneously. Kerr induced self-phase modulation (SPM) is often used to broaden the spectrum to achieve post compression of short pulses. The pulse output energy is limited by the critical power that is relatively low in high gas pressure required with this approach. Similar limit exist with filament based post compression [4]
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