Two optical components can look almost identical, use the same substrate material, and have similar dimensions—yet their coating costs may be very different. The reason is that optical coating cost is driven less by the visible amount of coating material and more by the difficulty…
The topic is suitable as a foundational definition page. GIAI already has more specific content covering 1064 nm F-theta lenses, field-size calculation, standard vs. telecentric designs, and F-theta lens selection, so this page should act as the conceptual pillar rather than duplicate those narrower articles.…
A beam expander is an afocal telescope that scales a collimated beam diameter by M. Far-field divergence scales by 1/M; the diameter-angle product stays fixed at one wavelength. Galilean layouts avoid an internal focus; Keplerian layouts allow pinhole spatial filtering. Focused spot diameter shrinks by…
A beamsplitter does not treat s- and p-polarized light the same way. At any angle other than normal incidence, the reflectance of a surface or coating is higher for s-polarization than for p-polarization, and the difference grows with the angle of incidence. At 45°, the…
