The first observation of accurately periodic ferroelastic domains in neodymium pentaphosphate (NPP) is reported. A description is given of the nucleation process of these periodic domains in terms of a newly discovered phenomena of ferroelastic bubbles. These periodic arrays have been shown to be tunable from 70 to less than 0.5 μm. Device applications of these arrays as tunable active optical Bragg gratings and acoustic filters are discussed.

This paper describes the design, operation, theory, and data interpretation of an Optical Surface Analyzer (OSA). The OSA can measure carbon wear, lubricant depletion/accumulation, surface roughness, and lubricant alteration on carbon coated thin film disks. This device can measure an Angstrom of carbon wear or lubricant depletion/accumulation. The OSA can also measure debris generation and lubricant degradation through a measurement of optical index change. The lateral resolution of the OSA is approximately 5 by 10 microns and the bandwidth of the device is 2 MHz. The small device size allows it to be used within a test stand environment.

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