For applications using ultrashort pulses, which mirror should I use?
Dielectric mirror coatings can cause significant dispersive effects for ultrashort pulses. The dispersion of the material and the interference effects between the layers result in rapid phase variations at specific wavelengths. Since the group delay is related to the slope of the phase variation, these wavelength regions introduce significant group-delay errors that can broaden and distort your pulse. Therefore, for applications requiring ultrashort pulses, such as those with Ti:Sapphire lasers, we suggest using our silver-coated mirrors, which have minimal phase distortion.
