AIA/NAS 883-2013 pdf download MIRROR TARGETS, OPTICAL TOOLING FRONT SURFACE AND PLANO-PARALLEL
FRONT SURFACE
OPTICALLY FLAT TO 1/4 WAVELENGTH OF HELIUM-NEON LASER WAVELENGTH (6328A). POLISH SURFACE QUALITY10-5(REFMIL-PRF-13830)
PLANO-PARALLEL
EACH SURFACE TO BE OPTICALLY FLAT TO 1/4 WAVELENGTH OF HELIUM-NEON LASER WAVELENGTH (6328A)SURFACE QUALITY 10-5 (REF. MIL-PRF-13830) BOTH SURFACES MUST BE PARALLEL WITH RESPECT TO EACHOTHER WITHIN 2 ARC SECONDS