Glossary - alphabet order - "Q"
QMEMS is a combination of 'Quartz', a crystal material with excellent characteristics such as high stability and high precision, and "MEMS" (a micro fabrication technology). To a semiconductor MEMS material, we apply precision micro processing based on quartz material to create a quartz device that we call 'QMEMS' which offers high performance in a compact package.
*QMEMS and its logos are registered trademarks or trademarks of Seiko Epson Corporation in Japan and other countries.
Quarter wave plate
It gives a light path difference of one quarter wavelength (phase difference δ = 90° + N × 360°, N is an integer ) to two linearly polarized light (parallel and perpendicular light components) when light passes through the quarter-waveplate. It converts linearly polarized light into circularly polarized light and vice versa.
Quartz crystals are hexagonal mono crystals such as SiO2 crystal. This includes both natural quartz crystal and synthetic quartz crystal. Natural quartz crystals are typically used for ornamental products. They were also used in industrial-use crystal devices until the mid-1960s. Since then, synthetic quartz crystals have been preferred for industrial uses since they have superior quality, relatively few impurities or lattice defects, and can be supplied steadily.
|Natural quartz crystal||Synthetic quartz crystal|