What are the applications of BK7 (K9) dove prism?
Image Rotation (180°): corrects image orientation in telescopes, microscopes, or laser scanning systems.
Beam Folding: alters the beam path in compact optical systems to save space.
Laser Systems: used for laser beam steering, but note BK7’s laser damage threshold (~10 J/cm² @ 1064 nm, 10 ns pulse).
Optical Instruments: employed in interferometers, spectrometers, etc., for beam adjustment or aberration compensation.

How to select the material of dove prisms based on the working wavelength?
UV: Fused Sillica(SiO2), CaF2.
VIS: BK7(n=1.52), K9.
IR: Silicon, Germanium, ZnSe.