Material: Nd:YAG Nd dopant concentration: as specified ¦ 0.1% Parallelism: 10" Flatness: l/10 @ 632nm Perpendicularity: < 2' Interference fringes: < 0.5 fringes/inch Extinction ratio: >15db Transmission with AR coating: ¦99.8% Damage threshold: >15J/cm2.