Are these standard mirrors suitable for my femtosecond laser system? Will these mirrors maintain the temporal characteristics of the laser beam? Will they handle high peak intensity? These are the main three questions you will not care about if ultrafast mirrors are employed in your femtosecond and picosecond lasers and laser systems. Ultrafast laser line mirrors are designed to cover Yb:KGW, Yb:KYW, Yb:YAG, Yb doped fiber laser lines with high reflectance and low GDD.