The large-aperture (up to 40 cm × 80 cm) mirrors required for the National Ignition Facility have very stringent specifications. The specifications include requirements for transmitted and reflected wavefront over a wide spectral frequency, surface quality, laser resistance, spectral characteristics, etc. In order to validate optic performance, metrology tools were fielded at optic fabrication vendors to assure production control. These tools include interferometers, largearea conditioning stations, and photometers. Of the 1800 large-aperture mirrors required for the NIF, approximately 35% have been completed. This presentation will review the types of large-aperture mirrors used on NIF along with the performance of NIF optics as measured and received from our vendors.
Optical specifications for the National Ignition Facility apply power spectral density (PSD) analysis to restrict the influence of periodic frequencies over the range of 0.03 mm -1 to 100 mm -1 . Phase measuring interferometry is applied to the measurement of such frequencies and presented here is a description of the instrumentation and example measurements on NIF pilot production optics.
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