Group Delay Dispersion (GDD) For Reflected Laser Light

When ultrashort laser pulses broaden as they pass through optics, peak intensity drops, and with it, your ability to image deep into tissue without damaging the sample. The culprit is group delay dispersion, introduced by every mirror, lens, and beamsplitter in the optical path. Managing GDD isn't just about minimizing it; for applications requiring dispersion compensation, the smoothness and consistency of the GDD curve across wavelengths matters as much as its magnitude.

Semrock's FF670-SDi01 and FF720-SDi01 short-wave-pass dichroic beamsplitters are engineered to address both challenges, delivering exceptionally low, smoothly varying GDD in reflection across the Ti:Sapphire tuning range, while maintaining near-parity between s- and p-polarizations.

This results in less pulse broadening, deeper imaging depth, and preserved polarization sensitivity. Explore the full application note to learn more.