More and more ultrafast few-cycle laser systems for strong field physics are operating at ultrahigh repetition rates reaching 50 kHz and more, where the extraction of the carrier-envelope phase (CEP) for each single pulse at higher repetition rates remains a challenge. We report here on a technique allowing the measurement of the CEP up to tens of MHz and it is demonstrated here at 100 kHz. Real time single-shot measurement/tagging of CEP at full (100 kHz) repetition rate is achieved by combining dispersive Fourier transform (DFT, TOUCAN) with field-programmable gate array (FPGA) technology for on-the-fly phase extraction from an 2f-to-f signal mapped to time domain.
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