AiryLinkMargin is a handy toolkit for everyday optics work. Convert wavelength and frequency fast, even inside glass or fiber. Turn refractive index into phase speed to time your paths. Estimate group speed and dispersion to keep short pulses tight. Add up fiber, splice, and connector loss to check your link margin. Swap between bandwidth and coherence length for quick interferometry checks. Predict fringe spacing and diffraction-limited spot size for clean alignment. Estimate polarizer stack throughput, and turn optical power into photodiode current—plus a simple tool to gauge precipitator particle capture.