ABSTRACT
A new scheme for phase control of optical components with laser ablation has been developed. One can ablate the surface shape of optical plastic material coated on a glass plate by using 193-nm laser light to control the transmission wave front. The surface shape is monitored in situ and corrected to attain the desired aberration level. The irradiation fluence is approximately 40 mJ/cm(2), and the ablation depth/pulse is approximately 0.01 microm/pulse for UV-cured resin. A wave-front aberration of 3.0 lambda is reduced to 0.17 lambda for flat surface shaping. For spherical surface generation, an aberration of 2.5 lambda is reduced to 0.2 lambda. The increase in surface roughness is kept within acceptable levels.
ABSTRACT
The T-Scan system which was developed by Dr. W.L. Maness in 1987 is a new computerized device which can analyze time and force of occlusal contacts. It has potential to analyze occlusal contacts quantitatively. The purpose of this study is to investigate its accuracy for measurement as quantitative analysis device. The following conclusions can be drawn from this study: 1. The time display of T-Scan system was approximately 64/100 of real time. 2. The force display of T-Scan system showed weak correlation to loads when loads from 1 to 10 kg were added on the sensor at random position. 3. T-Scan sensor had non-sensible areas caused by its structure.
