The difference between IBS vs IAD optical coating comes down to how much kinetic energy the film-forming atoms carry when they land, and what that energy buys you. Ion beam sputtering (IBS) delivers sputtered atoms with several to tens of electronvolts, producing amorphous, essentially fully…
A flat-top bandpass filter holds near-peak transmission across the whole passband and then drops steeply at both edges. A Gaussian bandpass filter reaches maximum transmission only at the center wavelength and falls away gradually on either side. The choice between a flat-top vs Gaussian bandpass…
The practical difference between OD4 vs OD6 optical filter blocking is a factor of 100 in transmitted unwanted light. OD4 permits a maximum transmittance of 10-4, or 0.01%, while OD6 corresponds to 10-6, or 0.0001%. That difference can be important when a detector must separate…
