characterization of fs-laser pulses
The generation, optimization and application of femtosecond pulses ranging from UV through visible to infrared pulses require reliable temporal characterization devices. We have developed a number of instruments to this end, the most important ones of which are listed below.
SHG Autocorrelator: Single-shot and multi-shot intensity and interferometric autocorrelators based on second harmonig generation (SHG) are used to monitor the duration of laser pulses of durations ranging from a few femtoseconds to ~100 ps.
SS SHG FROG: Single-shot frequency-resolved optical gating based on SHG is used to measure the temporal intensity profile and chirp of NIR pulses down to the sub-10-fs domain.
SD FROG Self-diffraction FROG is used to measure the temporal intensity profile and chirp of UV/VIS/NIR pulses down to the single-cycle limit.
THG FROG: Third-harmonic-generation FROG is employed to determine the temporal intensity profile and chirp of NIR/MIR pulses down to the single-cycle limit.
SPIDER: Spectral interferometry for direct electric field reconstruction is a useful method to determine the temporal intensity profile and chirp of NIR sub-10-fs pulses.
HDR autocorrelator: high-dynamic range autocorrelator based on THG, capable of measuring pre-/post-pulse structure over a dynamic range of >10 orders of magnitude.
contact: E. Goulielmakis
, X. Gu, L.Veisz
Fig. 1. Self-diffraction FROG is used to measure the temporal intensity profile and chirp of UV/VIS/NIR pulses. (© Ivanka Grguras )