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%