precision phase retardation
insensitive to temperature, wavelength, angle of incidence and collimation
Crystalline quartz is frequently used for those of the highest quality retardation applications. Zero-order retarder is made by cementing together two quartz plates with their fast axes orthogonal to each other. The difference in thickness is equal to either λ/4 or λ/2 for a specified wavelength. Compared with the multiple-order quarz retarder, it is much more insensitive to the variation of retardation with wavelength, temperature coefficient dependence of retardation and angle of incidence. The zero-order plates of 532 nm (LCD pumped solid state laser) and 633 nm (He-Ne laser) are from stock. The wave plates for other wavelength and size are custom made.