The discussion centers on distinguishing between zero and multiple quarter wave plates, specifically for a wavelength of 550 nm. The key formula presented is delta phase = m * 2π + π/2, where the variable m determines the type of quarter wave plate. The user seeks guidance on how to calculate m, given that the absolute phase difference is unspecified, but the relative phase difference is known to be π/2. The conversation emphasizes the importance of understanding indices of refraction and their dispersion characteristics for accurate determination.
PREREQUISITESOptical engineers, physicists, and students studying optics who need to understand the properties and applications of quarter wave plates in various wavelengths.
But I don't know indices of refractive. Actually absolute phase difference is not specified. I know relative phase difference which is equal to Pi/2 only.PietKuip said:You can test with other wavelengths, assuming that its indices of refraction (and their difference) does not have too much dispersion.