PR
Partial Reflection Subtypes
Reduce or split the incoming light
Subtypes
PR with fixed reflection/transmission ratio
DPR : Double PR Coating
Constant reflection/transmission for two wavelengths, ratio can be optimized separately
Find an example here.
BBPR : Broadband PR Coating
Constant reflection/transmission for a broadband wavelength range
Find an example here.
PR changes reflection/transmission ratio with AOI
VA : Variable Attenuator
Transmission can be varied continuously by changing the AOI (e.g. 0-45°), also available as Inversely Variable Attenuator (IVA)
Find examples here.
PR changes reflection/transmission ratio with beam position
GOC : Gradient Output Coupler
Transmission can be varied continuously by shifting a rectangular plate across the beam (right-middle-left position)
Find examples here.
For PR coatings with areas of high transmission
see coating type "Filter".