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WNWPM Multistage wave plate
The quartz multistage wave plate can cause multiple phase delays of the passing beam, and its thickness is generally between 0. 2 mm and 0. 5mm. It has good mechanical strength and high laser damage threshold.
The delay accuracy is slightly worse than that of zero-order wave plate, but because of its moderate price, it is often used in occasions with little change in temperature, wavelength and incident angle.
