Tower Optical Corp. has announced that its family of Zero Order wave plates are now available at any wavelength between 280 and 1350 nm. Using an improved manufacturing technology, the company says it can provide custom wave plates in three to five days instead of the typical eight weeks. Based on the AO15Z series, the air-spaced crystal quartz plates are manufactured to the desired thickness within 0.01 μm, and they are offered with either λ/4- or λ/2-wave retardation. All four surfaces of each plate have an antireflection coating, and the plates are built into 1-in. mounting rings.