Choosing a silicon lens starts with the operating wavelength, not the lens diameter or catalog shape. Confirm that silicon is suitable for the complete spectral band, then define the optical prescription, aperture, material grade, AR coating, temperature range, mechanical interface, and acceptance criteria. For demanding…
Physical thickness is the actual geometric thickness of a thin-film layer, while optical thickness describes how that layer affects the phase of light. At normal incidence, optical thickness is commonly written as ndn d, where nn is refractive index and dd is physical thickness. Two…
A machine vision filter manufacturer should do more than manufacture a filter around a nominal wavelength. The filter must be evaluated together with the illumination spectrum, camera sensor response, lens geometry, angle of incidence, required blocking range, mechanical integration, and inspection conditions. GIAI Photonics supports…
Internal transmittance falls exponentially with path length, τ = exp(−αd); doubling thickness squares τ, and the loss doubles only while absorption is weak. Uncoated glass at n = 1.5 transmits at most 92.3% at normal incidence (calculated); that gap is reflection, not absorption. A transmission…
