Single-shot, high-repetition rate carrier-envelope-phase detection of ultrashort laser pulses.

We propose a single-shot, high-repetition rate measurement scheme of the carrier-envelope phase offset of ultrashort laser pulses. The spectral fringes resulting from f-2f nonlinear interferometry, encoding the carrier-envelope-phase, are evaluated completely optically via an optical Fourier transform. For demonstration, the carrier-envelope-phase of a 200 kHz, few-cycle optical parametric chirped-pulse amplification (OPCPA) laser system was measured employing an interferometer as a periodic optical filter.

Multi-gigawatt peak power post-compression in a bulk multi-pass cell at a high repetition rate.

The output of a 200kHz, 34W, 300fs ytterbium amplifier is compressed to 31fs with >88 efficiency to reach a peak power of 2.5GW, which to date is a record for a single-stage bulk multi-pass cell. Despite operation 80 times above the critical power for self-focusing in bulk material, the setup demonstrates excellent preservation of the input beam quality.