Optical HK9L glass aimic prism/roof prism with AR coating

Amici prism,also called roof prism,17.98mm,HK9L glass with AR coating,used on spectrometer mostly.

Amici prism,also call roof prism,usually used on spectrometer,the specification of Amici prism as picture indicated:
N1=N2=2,Delta N1,N2=0.5
N3=N4=2,Delta N3,N4=0.5
Surface quality:60-40
Theta 1=Theta 2=10 '
Roof symmetry is 0.15,can have 3 break-points,small than 0.1
Perpendicularity of 3 and 4 faces is 10'
AR coating (MgF2 at 550nm) T>95%