| 摘要 |
PURPOSE:To improve a temperature characteristic and increase a resolving power by constructing a ring resonator having a phase modulator around a cylindrical body composed of a material with a low coefficient of expansion and forming an optical element on a disk-shaped substrate provided on the end of the ring resonator. CONSTITUTION:A ring laser gyro 1 is constituted by a cylindrical body 2 provided with a ring resonator and a disk-shaped substrate 3 provided with an optical element, such as a laser or the like. Both the cylindrical body 2 and substrate 3 are made of a material with a low coefficient of thermal expansion, such as quartz, saphire, ceramics or the like, and united by adhesion. A thin film wave directing path 4 made of quartz glass or the like that constitutes the ring resonator is formed around the outer circumferential surface of the cylindrical body 2. In the approximately middle intermediate position, a phase modulator 5 is provided. Due to such structure, the ring resonator can have a sufficiently large optical path length, a resolving power is high, a temperature characteristic is stable and reliable and the size of the whole apparatus can be reduced. |
