Broadband high-energy mirror for ultrashort pulse amplification system

We report a broadband high-energy mirror for TW-class chirped-pulse amplifi cation of approximate to 10-fs pulses. This mirror consists of broadband co atings and optimized high-damage-threshold coatings for decreasing the inte nsity on the broadband coatings. It is important to optimize the number of high-damage-threshold coatings so that high damage-threshold and relatively low dispersion are traded off against each other. The bandwidth of this mi rror (Delta lambda approximate to 200 nm at lambda(0) approximate to 800 nm ) is almost equivalent to that of a commercial broadband mirror, and the da mage threshold of this mirror is almost equivalent to that of a commercial high-energy mirror. This mirror can withstand chirped pulse laser beam's wi th high fluence (> 1 J/cm(2)) and wide spectra (153 nm FWHM) in practice.