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We present a simplified, alignment-free version of spectral interferometry using optical fibers. Spectral resolution is significantly improved using spatial fringes, avoiding time-domain filtering. We demonstrate this technique by measuring temporal chirp and a 12-ps double-pulse.
Pulse-front tilt in ultrashort laser pulses is usually considered equivalent to angular dispersion. We prove, however, that the combination of spatial and temporal chirp also produces pulse-front tilt. We verify this experimentally using a GRENOUILLE.
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