15 Mar 2021 Right angle prism is the most widely used prisms. It utilizes the inherent total internal reflection (TIR) at the hypotenuse to invert the image and achieve a 90° change in direction. This produces a left handed image and depending on the orientation of the prism, the image may be inverted or reverted. Right angle prisms can also be used in combination for image/beam displacement. It is typically coated on the hypotenuse with Al /Ag/Au to enhance reflectivity, while the input and output faces are coated with MgF2 (a common AR coat).3mm/5mm/10mm/12.7mm/20mm/25.4mm/30mm could be quick supply from Yutai Optics.
Yutai's suggestion for your choice:
a.Right-Angle Prism with AR Coating on the hypotenuse if you wish to use your prism as a retroreflector and you want to reduce surface reflections over the specified wavelength range of the coating.
b.Right-Angle Prism with appropriate AR Coating on the legs if you wish to use your prism as a 90 degree reflector and you want to reduce surface reflections over the specified wavelength range of the coating.
Specifications:
Material:BK7,Fused Silica
Dimension Tolerance：±0.1mm
Angle Tolerance：<3'
Surface Accuracy:λ/10@632.8nm
Surface Quality:40/20
Clear Aperture：>90%
Bevel: < 0.2mm×45°
Coating : Custom Design
Highly recommended RAP list from Yutai Optics:
H-KL9(BK7) Right Angle Prisms,
UV Fused Silica Right-Angle Prisms,
CaF2/BaF2 Right Angle Prisms,
ZnSe/ZnS Right Angle Prisms,
Si/Ge Right Angle Prisms. | 
