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We report on spectral phase retrieval of 400 fs pulses using shaper-assisted modified interferometric field autocorrelation. The coupled energy is only 5.2 aJ per pulse, corresponding to an unprecedented sensitivity of 2.7 × 10−9 mW2.
We report on spectral phase and intensity retrieval with 28-aJ coupled pulse energy by measuring two modified interferometric field autocorrelation (MIFA) traces using long periodically poled lithium niobate (PPLN) waveguide. The corresponding sensitivity is 1.1 times 10-7mW2.
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